2005-04-16 22:20:36 +00:00
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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2008-11-25 02:24:11 +00:00
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* Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
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2005-04-16 22:20:36 +00:00
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
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2008-11-25 02:24:11 +00:00
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* 2000-2002 x86-64 support by Andi Kleen
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2005-04-16 22:20:36 +00:00
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*/
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2012-05-22 02:50:07 +00:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2008-11-22 01:36:41 +00:00
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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2008-03-15 00:46:38 +00:00
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#include <linux/tracehook.h>
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2008-11-22 01:36:41 +00:00
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/personality.h>
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#include <linux/uaccess.h>
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2009-09-19 06:40:22 +00:00
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#include <linux/user-return-notifier.h>
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uprobes/core: Handle breakpoint and singlestep exceptions
Uprobes uses exception notifiers to get to know if a thread hit
a breakpoint or a singlestep exception.
When a thread hits a uprobe or is singlestepping post a uprobe
hit, the uprobe exception notifier sets its TIF_UPROBE bit,
which will then be checked on its return to userspace path
(do_notify_resume() ->uprobe_notify_resume()), where the
consumers handlers are run (in task context) based on the
defined filters.
Uprobe hits are thread specific and hence we need to maintain
information about if a task hit a uprobe, what uprobe was hit,
the slot where the original instruction was copied for xol so
that it can be singlestepped with appropriate fixups.
In some cases, special care is needed for instructions that are
executed out of line (xol). These are architecture specific
artefacts, such as handling RIP relative instructions on x86_64.
Since the instruction at which the uprobe was inserted is
executed out of line, architecture specific fixups are added so
that the thread continues normal execution in the presence of a
uprobe.
Postpone the signals until we execute the probed insn.
post_xol() path does a recalc_sigpending() before return to
user-mode, this ensures the signal can't be lost.
Uprobes relies on DIE_DEBUG notification to notify if a
singlestep is complete.
Adds x86 specific uprobe exception notifiers and appropriate
hooks needed to determine a uprobe hit and subsequent post
processing.
Add requisite x86 fixups for xol for uprobes. Specific cases
needing fixups include relative jumps (x86_64), calls, etc.
Where possible, we check and skip singlestepping the
breakpointed instructions. For now we skip single byte as well
as few multibyte nop instructions. However this can be extended
to other instructions too.
Credits to Oleg Nesterov for suggestions/patches related to
signal, breakpoint, singlestep handling code.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120313180011.29771.89027.sendpatchset@srdronam.in.ibm.com
[ Performed various cleanliness edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2012-03-13 18:00:11 +00:00
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#include <linux/uprobes.h>
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2008-03-06 09:33:08 +00:00
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2005-04-16 22:20:36 +00:00
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#include <asm/processor.h>
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#include <asm/ucontext.h>
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#include <asm/i387.h>
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2012-02-21 21:19:22 +00:00
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#include <asm/fpu-internal.h>
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2008-01-30 12:30:42 +00:00
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#include <asm/vdso.h>
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x86, mce: use 64bit machine check code on 32bit
The 64bit machine check code is in many ways much better than
the 32bit machine check code: it is more specification compliant,
is cleaner, only has a single code base versus one per CPU,
has better infrastructure for recovery, has a cleaner way to communicate
with user space etc. etc.
Use the 64bit code for 32bit too.
This is the second attempt to do this. There was one a couple of years
ago to unify this code for 32bit and 64bit. Back then this ran into some
trouble with K7s and was reverted.
I believe this time the K7 problems (and some others) are addressed.
I went over the old handlers and was very careful to retain
all quirks.
But of course this needs a lot of testing on old systems. On newer
64bit capable systems I don't expect much problems because they have been
already tested with the 64bit kernel.
I made this a CONFIG for now that still allows to select the old
machine check code. This is mostly to make testing easier,
if someone runs into a problem we can ask them to try
with the CONFIG switched.
The new code is default y for more coverage.
Once there is confidence the 64bit code works well on older hardware
too the CONFIG_X86_OLD_MCE and the associated code can be easily
removed.
This causes a behaviour change for 32bit installations. They now
have to install the mcelog package to be able to log
corrected machine checks.
The 64bit machine check code only handles CPUs which support the
standard Intel machine check architecture described in the IA32 SDM.
The 32bit code has special support for some older CPUs which
have non standard machine check architectures, in particular
WinChip C3 and Intel P5. I made those a separate CONFIG option
and kept them for now. The WinChip variant could be probably
removed without too much pain, it doesn't really do anything
interesting. P5 is also disabled by default (like it
was before) because many motherboards have it miswired, but
according to Alan Cox a few embedded setups use that one.
Forward ported/heavily changed version of old patch, original patch
included review/fixes from Thomas Gleixner, Bert Wesarg.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-04-28 17:07:31 +00:00
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#include <asm/mce.h>
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2012-02-19 15:38:43 +00:00
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#include <asm/sighandling.h>
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2008-11-22 01:36:41 +00:00
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#ifdef CONFIG_X86_64
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#include <asm/proto.h>
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#include <asm/ia32_unistd.h>
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2012-02-19 17:41:09 +00:00
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#include <asm/sys_ia32.h>
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2008-11-22 01:36:41 +00:00
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#endif /* CONFIG_X86_64 */
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2008-09-05 23:26:55 +00:00
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#include <asm/syscall.h>
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2008-07-21 16:04:13 +00:00
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#include <asm/syscalls.h>
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2008-03-06 09:33:08 +00:00
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2008-12-18 02:50:32 +00:00
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#include <asm/sigframe.h>
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2005-04-16 22:20:36 +00:00
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2008-02-08 20:09:59 +00:00
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#ifdef CONFIG_X86_32
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# define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
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#else
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# define FIX_EFLAGS __FIX_EFLAGS
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#endif
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2009-02-09 13:17:40 +00:00
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#define COPY(x) do { \
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get_user_ex(regs->x, &sc->x); \
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} while (0)
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2008-11-25 02:21:37 +00:00
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2009-02-09 13:17:40 +00:00
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#define GET_SEG(seg) ({ \
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unsigned short tmp; \
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get_user_ex(tmp, &sc->seg); \
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tmp; \
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})
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2008-11-25 02:21:37 +00:00
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2009-02-09 13:17:40 +00:00
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#define COPY_SEG(seg) do { \
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regs->seg = GET_SEG(seg); \
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} while (0)
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2008-11-25 02:21:37 +00:00
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2009-02-09 13:17:40 +00:00
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#define COPY_SEG_CPL3(seg) do { \
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regs->seg = GET_SEG(seg) | 3; \
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} while (0)
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2008-11-25 02:21:37 +00:00
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2012-02-19 15:43:09 +00:00
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int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
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unsigned long *pax)
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2008-11-25 02:21:37 +00:00
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{
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void __user *buf;
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unsigned int tmpflags;
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unsigned int err = 0;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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2009-01-23 23:50:10 +00:00
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get_user_try {
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2008-11-25 02:21:37 +00:00
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#ifdef CONFIG_X86_32
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2009-02-09 13:17:40 +00:00
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set_user_gs(regs, GET_SEG(gs));
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2009-01-23 23:50:10 +00:00
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COPY_SEG(fs);
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COPY_SEG(es);
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COPY_SEG(ds);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
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COPY(dx); COPY(cx); COPY(ip);
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2008-11-25 02:21:37 +00:00
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#ifdef CONFIG_X86_64
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2009-01-23 23:50:10 +00:00
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COPY(r8);
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COPY(r9);
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COPY(r10);
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COPY(r11);
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COPY(r12);
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COPY(r13);
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COPY(r14);
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COPY(r15);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_64 */
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#ifdef CONFIG_X86_32
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2009-01-23 23:50:10 +00:00
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COPY_SEG_CPL3(cs);
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COPY_SEG_CPL3(ss);
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2008-11-25 02:21:37 +00:00
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#else /* !CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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/* Kernel saves and restores only the CS segment register on signals,
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* which is the bare minimum needed to allow mixed 32/64-bit code.
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* App's signal handler can save/restore other segments if needed. */
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COPY_SEG_CPL3(cs);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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get_user_ex(tmpflags, &sc->flags);
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regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
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regs->orig_ax = -1; /* disable syscall checks */
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get_user_ex(buf, &sc->fpstate);
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err |= restore_i387_xstate(buf);
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2008-11-25 02:21:37 +00:00
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2009-01-23 23:50:10 +00:00
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get_user_ex(*pax, &sc->ax);
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} get_user_catch(err);
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2008-11-25 02:21:37 +00:00
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return err;
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}
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2012-02-19 15:43:09 +00:00
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int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
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struct pt_regs *regs, unsigned long mask)
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2008-11-25 02:21:37 +00:00
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{
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int err = 0;
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2009-01-23 23:50:10 +00:00
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put_user_try {
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2008-11-25 02:21:37 +00:00
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2009-01-23 23:50:10 +00:00
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#ifdef CONFIG_X86_32
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2009-02-09 13:17:40 +00:00
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put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
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2009-01-23 23:50:10 +00:00
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put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
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put_user_ex(regs->es, (unsigned int __user *)&sc->es);
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put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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put_user_ex(regs->di, &sc->di);
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put_user_ex(regs->si, &sc->si);
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put_user_ex(regs->bp, &sc->bp);
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put_user_ex(regs->sp, &sc->sp);
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put_user_ex(regs->bx, &sc->bx);
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put_user_ex(regs->dx, &sc->dx);
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put_user_ex(regs->cx, &sc->cx);
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put_user_ex(regs->ax, &sc->ax);
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2008-11-25 02:21:37 +00:00
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#ifdef CONFIG_X86_64
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2009-01-23 23:50:10 +00:00
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put_user_ex(regs->r8, &sc->r8);
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put_user_ex(regs->r9, &sc->r9);
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put_user_ex(regs->r10, &sc->r10);
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put_user_ex(regs->r11, &sc->r11);
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put_user_ex(regs->r12, &sc->r12);
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put_user_ex(regs->r13, &sc->r13);
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put_user_ex(regs->r14, &sc->r14);
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put_user_ex(regs->r15, &sc->r15);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_64 */
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2012-03-12 09:25:55 +00:00
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put_user_ex(current->thread.trap_nr, &sc->trapno);
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2009-01-23 23:50:10 +00:00
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put_user_ex(current->thread.error_code, &sc->err);
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put_user_ex(regs->ip, &sc->ip);
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2008-11-25 02:21:37 +00:00
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#ifdef CONFIG_X86_32
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2009-01-23 23:50:10 +00:00
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put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
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put_user_ex(regs->flags, &sc->flags);
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put_user_ex(regs->sp, &sc->sp_at_signal);
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put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
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2008-11-25 02:21:37 +00:00
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#else /* !CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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put_user_ex(regs->flags, &sc->flags);
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put_user_ex(regs->cs, &sc->cs);
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put_user_ex(0, &sc->gs);
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put_user_ex(0, &sc->fs);
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2008-11-25 02:21:37 +00:00
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#endif /* CONFIG_X86_32 */
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2009-01-23 23:50:10 +00:00
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put_user_ex(fpstate, &sc->fpstate);
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2008-11-25 02:21:37 +00:00
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2009-01-23 23:50:10 +00:00
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/* non-iBCS2 extensions.. */
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put_user_ex(mask, &sc->oldmask);
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put_user_ex(current->thread.cr2, &sc->cr2);
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} put_user_catch(err);
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2008-11-25 02:21:37 +00:00
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return err;
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}
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|
2005-04-16 22:20:36 +00:00
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/*
|
2008-11-25 02:23:12 +00:00
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* Set up a signal frame.
|
2005-04-16 22:20:36 +00:00
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*/
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/*
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* Determine which stack to use..
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*/
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2009-02-27 18:30:32 +00:00
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static unsigned long align_sigframe(unsigned long sp)
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{
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#ifdef CONFIG_X86_32
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/*
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* Align the stack pointer according to the i386 ABI,
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* i.e. so that on function entry ((sp + 4) & 15) == 0.
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*/
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sp = ((sp + 4) & -16ul) - 4;
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#else /* !CONFIG_X86_32 */
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sp = round_down(sp, 16) - 8;
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#endif
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return sp;
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}
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|
2005-04-16 22:20:36 +00:00
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static inline void __user *
|
2008-07-29 17:29:21 +00:00
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
|
2009-02-27 18:27:04 +00:00
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void __user **fpstate)
|
2005-04-16 22:20:36 +00:00
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{
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/* Default to using normal stack */
|
2009-02-27 18:29:57 +00:00
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|
unsigned long sp = regs->sp;
|
2009-03-19 17:56:29 +00:00
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|
int onsigstack = on_sig_stack(sp);
|
2009-02-27 18:29:57 +00:00
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#ifdef CONFIG_X86_64
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/* redzone */
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sp -= 128;
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#endif /* CONFIG_X86_64 */
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2009-03-19 17:56:29 +00:00
|
|
|
if (!onsigstack) {
|
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
|
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
2009-03-26 17:03:08 +00:00
|
|
|
if (current->sas_ss_size)
|
2009-03-19 17:56:29 +00:00
|
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
|
} else {
|
2009-02-27 18:29:57 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2009-03-19 17:56:29 +00:00
|
|
|
/* This is the legacy signal stack switching. */
|
|
|
|
|
if ((regs->ss & 0xffff) != __USER_DS &&
|
|
|
|
|
!(ka->sa.sa_flags & SA_RESTORER) &&
|
|
|
|
|
ka->sa.sa_restorer)
|
|
|
|
|
sp = (unsigned long) ka->sa.sa_restorer;
|
2009-02-27 18:29:57 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
2009-03-19 17:56:29 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2008-07-29 17:29:21 +00:00
|
|
|
if (used_math()) {
|
2009-02-27 18:29:57 +00:00
|
|
|
sp -= sig_xstate_size;
|
2009-03-03 01:20:01 +00:00
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
|
sp = round_down(sp, 64);
|
|
|
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
|
*fpstate = (void __user *)sp;
|
2008-07-29 17:29:21 +00:00
|
|
|
}
|
|
|
|
|
|
2009-03-19 17:56:29 +00:00
|
|
|
sp = align_sigframe(sp - frame_size);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* If we are on the alternate signal stack and would overflow it, don't.
|
|
|
|
|
* Return an always-bogus address instead so we will die with SIGSEGV.
|
|
|
|
|
*/
|
|
|
|
|
if (onsigstack && !likely(on_sig_stack(sp)))
|
|
|
|
|
return (void __user *)-1L;
|
|
|
|
|
|
|
|
|
|
/* save i387 state */
|
|
|
|
|
if (used_math() && save_i387_xstate(*fpstate) < 0)
|
|
|
|
|
return (void __user *)-1L;
|
|
|
|
|
|
|
|
|
|
return (void __user *)sp;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2009-02-27 18:29:57 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
|
static const struct {
|
|
|
|
|
u16 poplmovl;
|
|
|
|
|
u32 val;
|
|
|
|
|
u16 int80;
|
|
|
|
|
} __attribute__((packed)) retcode = {
|
|
|
|
|
0xb858, /* popl %eax; movl $..., %eax */
|
|
|
|
|
__NR_sigreturn,
|
|
|
|
|
0x80cd, /* int $0x80 */
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static const struct {
|
|
|
|
|
u8 movl;
|
|
|
|
|
u32 val;
|
|
|
|
|
u16 int80;
|
|
|
|
|
u8 pad;
|
|
|
|
|
} __attribute__((packed)) rt_retcode = {
|
|
|
|
|
0xb8, /* movl $..., %eax */
|
|
|
|
|
__NR_rt_sigreturn,
|
|
|
|
|
0x80cd, /* int $0x80 */
|
|
|
|
|
0
|
|
|
|
|
};
|
|
|
|
|
|
2008-03-06 09:33:08 +00:00
|
|
|
static int
|
2008-09-05 23:28:06 +00:00
|
|
|
__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
|
|
|
|
|
struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
struct sigframe __user *frame;
|
2008-03-06 09:33:08 +00:00
|
|
|
void __user *restorer;
|
2005-04-16 22:20:36 +00:00
|
|
|
int err = 0;
|
2008-07-29 17:29:22 +00:00
|
|
|
void __user *fpstate = NULL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-29 17:29:21 +00:00
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-09-13 00:02:53 +00:00
|
|
|
if (__put_user(sig, &frame->sig))
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-09-13 00:02:53 +00:00
|
|
|
if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (_NSIG_WORDS > 1) {
|
2008-09-13 00:02:53 +00:00
|
|
|
if (__copy_to_user(&frame->extramask, &set->sig[1],
|
|
|
|
|
sizeof(frame->extramask)))
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2008-04-09 08:29:27 +00:00
|
|
|
if (current->mm->context.vdso)
|
2008-01-30 12:30:42 +00:00
|
|
|
restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
|
2007-02-13 12:26:26 +00:00
|
|
|
else
|
2008-01-30 12:33:23 +00:00
|
|
|
restorer = &frame->retcode;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (ka->sa.sa_flags & SA_RESTORER)
|
|
|
|
|
restorer = ka->sa.sa_restorer;
|
|
|
|
|
|
|
|
|
|
/* Set up to return from userspace. */
|
|
|
|
|
err |= __put_user(restorer, &frame->pretcode);
|
2008-03-06 09:33:08 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
2008-03-06 09:33:08 +00:00
|
|
|
* This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
|
|
|
|
* WE DO NOT USE IT ANY MORE! It's only left here for historical
|
|
|
|
|
* reasons and because gdb uses it as a signature to notice
|
|
|
|
|
* signal handler stack frames.
|
|
|
|
|
*/
|
2008-11-12 03:09:29 +00:00
|
|
|
err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (err)
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
2008-03-06 09:33:08 +00:00
|
|
|
regs->sp = (unsigned long)frame;
|
|
|
|
|
regs->ip = (unsigned long)ka->sa.sa_handler;
|
|
|
|
|
regs->ax = (unsigned long)sig;
|
2008-02-08 20:09:56 +00:00
|
|
|
regs->dx = 0;
|
|
|
|
|
regs->cx = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->ds = __USER_DS;
|
|
|
|
|
regs->es = __USER_DS;
|
|
|
|
|
regs->ss = __USER_DS;
|
|
|
|
|
regs->cs = __USER_CS;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-01-19 01:44:00 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2008-09-05 23:28:06 +00:00
|
|
|
static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
|
|
|
sigset_t *set, struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
struct rt_sigframe __user *frame;
|
2008-03-06 09:33:08 +00:00
|
|
|
void __user *restorer;
|
2005-04-16 22:20:36 +00:00
|
|
|
int err = 0;
|
2008-07-29 17:29:22 +00:00
|
|
|
void __user *fpstate = NULL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-29 17:29:21 +00:00
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2009-01-23 23:50:10 +00:00
|
|
|
put_user_try {
|
|
|
|
|
put_user_ex(sig, &frame->sig);
|
|
|
|
|
put_user_ex(&frame->info, &frame->pinfo);
|
|
|
|
|
put_user_ex(&frame->uc, &frame->puc);
|
|
|
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
|
|
|
|
|
|
/* Create the ucontext. */
|
|
|
|
|
if (cpu_has_xsave)
|
|
|
|
|
put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
|
|
|
|
|
else
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_flags);
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_link);
|
|
|
|
|
put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
|
|
|
put_user_ex(sas_ss_flags(regs->sp),
|
|
|
|
|
&frame->uc.uc_stack.ss_flags);
|
|
|
|
|
put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
|
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
|
|
|
|
|
regs, set->sig[0]);
|
|
|
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
|
|
|
|
|
|
/* Set up to return from userspace. */
|
|
|
|
|
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
|
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER)
|
|
|
|
|
restorer = ka->sa.sa_restorer;
|
|
|
|
|
put_user_ex(restorer, &frame->pretcode);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* This is movl $__NR_rt_sigreturn, %ax ; int $0x80
|
|
|
|
|
*
|
|
|
|
|
* WE DO NOT USE IT ANY MORE! It's only left here for historical
|
|
|
|
|
* reasons and because gdb uses it as a signature to notice
|
|
|
|
|
* signal handler stack frames.
|
|
|
|
|
*/
|
|
|
|
|
put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
|
|
|
|
|
} put_user_catch(err);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (err)
|
2008-09-13 00:01:09 +00:00
|
|
|
return -EFAULT;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
2008-03-06 09:33:08 +00:00
|
|
|
regs->sp = (unsigned long)frame;
|
|
|
|
|
regs->ip = (unsigned long)ka->sa.sa_handler;
|
2008-09-05 23:28:38 +00:00
|
|
|
regs->ax = (unsigned long)sig;
|
2008-03-06 09:33:08 +00:00
|
|
|
regs->dx = (unsigned long)&frame->info;
|
|
|
|
|
regs->cx = (unsigned long)&frame->uc;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->ds = __USER_DS;
|
|
|
|
|
regs->es = __USER_DS;
|
|
|
|
|
regs->ss = __USER_DS;
|
|
|
|
|
regs->cs = __USER_CS;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-01-19 01:44:00 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-11-25 02:23:12 +00:00
|
|
|
#else /* !CONFIG_X86_32 */
|
|
|
|
|
static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
|
|
|
sigset_t *set, struct pt_regs *regs)
|
|
|
|
|
{
|
|
|
|
|
struct rt_sigframe __user *frame;
|
|
|
|
|
void __user *fp = NULL;
|
|
|
|
|
int err = 0;
|
|
|
|
|
struct task_struct *me = current;
|
|
|
|
|
|
2009-02-27 18:28:48 +00:00
|
|
|
frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO) {
|
|
|
|
|
if (copy_siginfo_to_user(&frame->info, info))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
|
2009-01-23 23:50:10 +00:00
|
|
|
put_user_try {
|
|
|
|
|
/* Create the ucontext. */
|
|
|
|
|
if (cpu_has_xsave)
|
|
|
|
|
put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
|
|
|
|
|
else
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_flags);
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_link);
|
|
|
|
|
put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
|
|
|
put_user_ex(sas_ss_flags(regs->sp),
|
|
|
|
|
&frame->uc.uc_stack.ss_flags);
|
|
|
|
|
put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
|
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
|
|
|
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
|
|
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
|
|
|
already in userspace. */
|
|
|
|
|
/* x86-64 should always use SA_RESTORER. */
|
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
|
|
|
put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
|
|
|
|
|
} else {
|
|
|
|
|
/* could use a vstub here */
|
|
|
|
|
err |= -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
} put_user_catch(err);
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
|
|
|
|
regs->di = sig;
|
|
|
|
|
/* In case the signal handler was declared without prototypes */
|
|
|
|
|
regs->ax = 0;
|
|
|
|
|
|
|
|
|
|
/* This also works for non SA_SIGINFO handlers because they expect the
|
|
|
|
|
next argument after the signal number on the stack. */
|
|
|
|
|
regs->si = (unsigned long)&frame->info;
|
|
|
|
|
regs->dx = (unsigned long)&frame->uc;
|
|
|
|
|
regs->ip = (unsigned long) ka->sa.sa_handler;
|
|
|
|
|
|
|
|
|
|
regs->sp = (unsigned long)frame;
|
|
|
|
|
|
|
|
|
|
/* Set up the CS register to run signal handlers in 64-bit mode,
|
|
|
|
|
even if the handler happens to be interrupting 32-bit code. */
|
|
|
|
|
regs->cs = __USER_CS;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
|
|
2008-11-25 02:24:11 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2008-11-25 02:23:12 +00:00
|
|
|
/*
|
|
|
|
|
* Atomically swap in the new signal mask, and wait for a signal.
|
|
|
|
|
*/
|
|
|
|
|
asmlinkage int
|
|
|
|
|
sys_sigsuspend(int history0, int history1, old_sigset_t mask)
|
|
|
|
|
{
|
2011-07-10 19:27:27 +00:00
|
|
|
sigset_t blocked;
|
|
|
|
|
siginitset(&blocked, mask);
|
2012-05-22 01:42:32 +00:00
|
|
|
return sigsuspend(&blocked);
|
2008-11-25 02:23:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
asmlinkage int
|
|
|
|
|
sys_sigaction(int sig, const struct old_sigaction __user *act,
|
|
|
|
|
struct old_sigaction __user *oact)
|
|
|
|
|
{
|
|
|
|
|
struct k_sigaction new_ka, old_ka;
|
2009-01-23 23:50:10 +00:00
|
|
|
int ret = 0;
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
if (act) {
|
|
|
|
|
old_sigset_t mask;
|
|
|
|
|
|
2009-01-23 23:50:10 +00:00
|
|
|
if (!access_ok(VERIFY_READ, act, sizeof(*act)))
|
2008-11-25 02:23:12 +00:00
|
|
|
return -EFAULT;
|
|
|
|
|
|
2009-01-23 23:50:10 +00:00
|
|
|
get_user_try {
|
|
|
|
|
get_user_ex(new_ka.sa.sa_handler, &act->sa_handler);
|
|
|
|
|
get_user_ex(new_ka.sa.sa_flags, &act->sa_flags);
|
|
|
|
|
get_user_ex(mask, &act->sa_mask);
|
|
|
|
|
get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer);
|
|
|
|
|
} get_user_catch(ret);
|
|
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
|
return -EFAULT;
|
2008-11-25 02:23:12 +00:00
|
|
|
siginitset(&new_ka.sa.sa_mask, mask);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
|
|
|
|
|
|
|
|
|
|
if (!ret && oact) {
|
2009-01-23 23:50:10 +00:00
|
|
|
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
|
2008-11-25 02:23:12 +00:00
|
|
|
return -EFAULT;
|
|
|
|
|
|
2009-01-23 23:50:10 +00:00
|
|
|
put_user_try {
|
|
|
|
|
put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler);
|
|
|
|
|
put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags);
|
|
|
|
|
put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
|
|
|
|
|
put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer);
|
|
|
|
|
} put_user_catch(ret);
|
|
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
|
return -EFAULT;
|
2008-11-25 02:23:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
2008-11-25 02:24:11 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
2008-11-25 02:23:12 +00:00
|
|
|
|
2009-12-10 00:01:54 +00:00
|
|
|
long
|
2008-11-25 02:23:12 +00:00
|
|
|
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
|
|
|
|
|
struct pt_regs *regs)
|
|
|
|
|
{
|
|
|
|
|
return do_sigaltstack(uss, uoss, regs->sp);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Do a signal return; undo the signal stack.
|
|
|
|
|
*/
|
2008-11-25 02:24:11 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2009-02-11 21:43:58 +00:00
|
|
|
unsigned long sys_sigreturn(struct pt_regs *regs)
|
2008-11-25 02:23:12 +00:00
|
|
|
{
|
|
|
|
|
struct sigframe __user *frame;
|
|
|
|
|
unsigned long ax;
|
|
|
|
|
sigset_t set;
|
|
|
|
|
|
|
|
|
|
frame = (struct sigframe __user *)(regs->sp - 8);
|
|
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
|
|
|
goto badframe;
|
|
|
|
|
if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
|
|
|
|
|
&& __copy_from_user(&set.sig[1], &frame->extramask,
|
|
|
|
|
sizeof(frame->extramask))))
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
2011-07-10 19:27:27 +00:00
|
|
|
set_current_blocked(&set);
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
if (restore_sigcontext(regs, &frame->sc, &ax))
|
|
|
|
|
goto badframe;
|
|
|
|
|
return ax;
|
|
|
|
|
|
|
|
|
|
badframe:
|
2008-12-16 22:02:16 +00:00
|
|
|
signal_fault(regs, frame, "sigreturn");
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2008-11-25 02:24:11 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
2008-11-25 02:23:12 +00:00
|
|
|
|
2009-02-12 00:31:40 +00:00
|
|
|
long sys_rt_sigreturn(struct pt_regs *regs)
|
2008-11-25 02:23:12 +00:00
|
|
|
{
|
|
|
|
|
struct rt_sigframe __user *frame;
|
|
|
|
|
unsigned long ax;
|
|
|
|
|
sigset_t set;
|
|
|
|
|
|
|
|
|
|
frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
|
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
|
|
|
goto badframe;
|
|
|
|
|
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
2011-04-27 19:09:39 +00:00
|
|
|
set_current_blocked(&set);
|
2008-11-25 02:23:12 +00:00
|
|
|
|
|
|
|
|
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
|
|
if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
|
|
return ax;
|
|
|
|
|
|
|
|
|
|
badframe:
|
|
|
|
|
signal_fault(regs, frame, "rt_sigreturn");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
2008-03-06 09:33:08 +00:00
|
|
|
* OK, we're invoking a handler:
|
|
|
|
|
*/
|
2008-09-25 02:10:29 +00:00
|
|
|
static int signr_convert(int sig)
|
|
|
|
|
{
|
2008-10-30 01:44:08 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2008-09-25 02:10:29 +00:00
|
|
|
struct thread_info *info = current_thread_info();
|
|
|
|
|
|
|
|
|
|
if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
|
|
|
|
|
return info->exec_domain->signal_invmap[sig];
|
2008-10-30 01:44:08 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
2008-09-25 02:10:29 +00:00
|
|
|
return sig;
|
|
|
|
|
}
|
|
|
|
|
|
2008-10-30 01:46:07 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
|
|
2008-09-25 02:13:11 +00:00
|
|
|
#define is_ia32 1
|
2008-09-25 02:13:29 +00:00
|
|
|
#define ia32_setup_frame __setup_frame
|
|
|
|
|
#define ia32_setup_rt_frame __setup_rt_frame
|
2008-09-25 02:13:11 +00:00
|
|
|
|
2008-10-30 01:46:07 +00:00
|
|
|
#else /* !CONFIG_X86_32 */
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
|
|
|
#define is_ia32 test_thread_flag(TIF_IA32)
|
|
|
|
|
#else /* !CONFIG_IA32_EMULATION */
|
|
|
|
|
#define is_ia32 0
|
|
|
|
|
#endif /* CONFIG_IA32_EMULATION */
|
|
|
|
|
|
2012-02-19 17:41:09 +00:00
|
|
|
#ifdef CONFIG_X86_X32_ABI
|
|
|
|
|
#define is_x32 test_thread_flag(TIF_X32)
|
|
|
|
|
|
|
|
|
|
static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
|
|
|
|
|
siginfo_t *info, compat_sigset_t *set,
|
|
|
|
|
struct pt_regs *regs);
|
|
|
|
|
#else /* !CONFIG_X86_X32_ABI */
|
|
|
|
|
#define is_x32 0
|
|
|
|
|
#endif /* CONFIG_X86_X32_ABI */
|
|
|
|
|
|
2008-12-18 02:47:17 +00:00
|
|
|
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
|
|
|
sigset_t *set, struct pt_regs *regs);
|
|
|
|
|
int ia32_setup_frame(int sig, struct k_sigaction *ka,
|
|
|
|
|
sigset_t *set, struct pt_regs *regs);
|
|
|
|
|
|
2008-10-30 01:46:07 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
|
|
2008-09-05 23:28:06 +00:00
|
|
|
static int
|
|
|
|
|
setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
2011-07-10 18:22:03 +00:00
|
|
|
struct pt_regs *regs)
|
2008-09-05 23:28:06 +00:00
|
|
|
{
|
2008-09-25 02:10:29 +00:00
|
|
|
int usig = signr_convert(sig);
|
2012-05-02 13:59:21 +00:00
|
|
|
sigset_t *set = sigmask_to_save();
|
2008-09-05 23:28:06 +00:00
|
|
|
|
|
|
|
|
/* Set up the stack frame */
|
2008-09-25 02:13:11 +00:00
|
|
|
if (is_ia32) {
|
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
2012-05-22 03:42:15 +00:00
|
|
|
return ia32_setup_rt_frame(usig, ka, info, set, regs);
|
2008-09-25 02:13:11 +00:00
|
|
|
else
|
2012-05-22 03:42:15 +00:00
|
|
|
return ia32_setup_frame(usig, ka, set, regs);
|
2012-02-19 17:41:09 +00:00
|
|
|
#ifdef CONFIG_X86_X32_ABI
|
|
|
|
|
} else if (is_x32) {
|
2012-05-22 03:42:15 +00:00
|
|
|
return x32_setup_rt_frame(usig, ka, info,
|
2012-02-19 17:41:09 +00:00
|
|
|
(compat_sigset_t *)set, regs);
|
|
|
|
|
#endif
|
|
|
|
|
} else {
|
2012-05-22 03:42:15 +00:00
|
|
|
return __setup_rt_frame(sig, ka, info, set, regs);
|
2012-02-19 17:41:09 +00:00
|
|
|
}
|
2008-09-05 23:28:06 +00:00
|
|
|
}
|
|
|
|
|
|
2012-05-22 03:42:15 +00:00
|
|
|
static void
|
2005-04-16 22:20:36 +00:00
|
|
|
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
|
2011-07-10 18:22:03 +00:00
|
|
|
struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
/* Are we from a system call? */
|
2008-09-05 23:26:55 +00:00
|
|
|
if (syscall_get_nr(current, regs) >= 0) {
|
2005-04-16 22:20:36 +00:00
|
|
|
/* If so, check system call restarting.. */
|
2008-09-05 23:26:55 +00:00
|
|
|
switch (syscall_get_error(current, regs)) {
|
2008-02-08 20:09:58 +00:00
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
|
regs->ax = -EINTR;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->ax = -EINTR;
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
2008-02-08 20:09:58 +00:00
|
|
|
}
|
|
|
|
|
/* fallthrough */
|
|
|
|
|
case -ERESTARTNOINTR:
|
|
|
|
|
regs->ax = regs->orig_ax;
|
|
|
|
|
regs->ip -= 2;
|
|
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
2008-01-30 12:30:50 +00:00
|
|
|
* If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
|
|
|
|
|
* flag so that register information in the sigcontext is correct.
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
2008-01-30 12:30:56 +00:00
|
|
|
if (unlikely(regs->flags & X86_EFLAGS_TF) &&
|
2008-01-30 12:30:50 +00:00
|
|
|
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->flags &= ~X86_EFLAGS_TF;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2012-05-22 03:42:15 +00:00
|
|
|
if (setup_rt_frame(sig, ka, info, regs) < 0) {
|
|
|
|
|
force_sigsegv(sig, current);
|
|
|
|
|
return;
|
|
|
|
|
}
|
2005-06-23 07:08:21 +00:00
|
|
|
|
2008-04-19 21:26:54 +00:00
|
|
|
/*
|
|
|
|
|
* Clear the direction flag as per the ABI for function entry.
|
|
|
|
|
*/
|
|
|
|
|
regs->flags &= ~X86_EFLAGS_DF;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Clear TF when entering the signal handler, but
|
|
|
|
|
* notify any tracer that was single-stepping it.
|
|
|
|
|
* The tracer may want to single-step inside the
|
|
|
|
|
* handler too.
|
|
|
|
|
*/
|
|
|
|
|
regs->flags &= ~X86_EFLAGS_TF;
|
|
|
|
|
|
2012-04-28 06:04:15 +00:00
|
|
|
signal_delivered(sig, info, ka, regs,
|
|
|
|
|
test_thread_flag(TIF_SINGLESTEP));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2008-10-30 01:46:40 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2008-09-05 23:27:39 +00:00
|
|
|
#define NR_restart_syscall __NR_restart_syscall
|
2008-10-30 01:46:40 +00:00
|
|
|
#else /* !CONFIG_X86_32 */
|
|
|
|
|
#define NR_restart_syscall \
|
|
|
|
|
test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
|
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
|
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
|
|
|
* mistake.
|
|
|
|
|
*/
|
2008-01-30 12:31:17 +00:00
|
|
|
static void do_signal(struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-02-08 20:09:58 +00:00
|
|
|
struct k_sigaction ka;
|
2005-04-16 22:20:36 +00:00
|
|
|
siginfo_t info;
|
|
|
|
|
int signr;
|
|
|
|
|
|
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
|
|
|
if (signr > 0) {
|
2008-03-06 09:33:08 +00:00
|
|
|
/* Whee! Actually deliver the signal. */
|
2011-07-10 18:22:03 +00:00
|
|
|
handle_signal(signr, &info, &ka, regs);
|
2006-01-19 01:44:00 +00:00
|
|
|
return;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Did we come from a system call? */
|
2008-09-05 23:26:55 +00:00
|
|
|
if (syscall_get_nr(current, regs) >= 0) {
|
2005-04-16 22:20:36 +00:00
|
|
|
/* Restart the system call - no handlers present */
|
2008-09-05 23:26:55 +00:00
|
|
|
switch (syscall_get_error(current, regs)) {
|
2006-01-19 01:44:00 +00:00
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
|
case -ERESTARTNOINTR:
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->ax = regs->orig_ax;
|
|
|
|
|
regs->ip -= 2;
|
2006-01-19 01:44:00 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
2008-09-05 23:27:39 +00:00
|
|
|
regs->ax = NR_restart_syscall;
|
2008-01-30 12:30:56 +00:00
|
|
|
regs->ip -= 2;
|
2006-01-19 01:44:00 +00:00
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
}
|
2006-01-19 01:44:00 +00:00
|
|
|
|
2008-02-08 20:09:58 +00:00
|
|
|
/*
|
|
|
|
|
* If there's no signal to deliver, we just put the saved sigmask
|
|
|
|
|
* back.
|
|
|
|
|
*/
|
2012-05-22 03:33:55 +00:00
|
|
|
restore_saved_sigmask();
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* notification of userspace execution resumption
|
2006-01-19 01:44:00 +00:00
|
|
|
* - triggered by the TIF_WORK_MASK flags
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
2008-03-06 09:33:08 +00:00
|
|
|
void
|
|
|
|
|
do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2009-07-08 22:31:41 +00:00
|
|
|
#ifdef CONFIG_X86_MCE
|
2008-09-24 00:21:45 +00:00
|
|
|
/* notify userspace of pending MCEs */
|
|
|
|
|
if (thread_info_flags & _TIF_MCE_NOTIFY)
|
x86, mce: support action-optional machine checks
Newer Intel CPUs support a new class of machine checks called recoverable
action optional.
Action Optional means that the CPU detected some form of corruption in
the background and tells the OS about using a machine check
exception. The OS can then take appropiate action, like killing the
process with the corrupted data or logging the event properly to disk.
This is done by the new generic high level memory failure handler added
in a earlier patch. The high level handler takes the address with the
failed memory and does the appropiate action, like killing the process.
In this version of the patch the high level handler is stubbed out
with a weak function to not create a direct dependency on the hwpoison
branch.
The high level handler cannot be directly called from the machine check
exception though, because it has to run in a defined process context to
be able to sleep when taking VM locks (it is not expected to sleep for a
long time, just do so in some exceptional cases like lock contention)
Thus the MCE handler has to queue a work item for process context,
trigger process context and then call the high level handler from there.
This patch adds two path to process context: through a per thread kernel
exit notify_user() callback or through a high priority work item.
The first runs when the process exits back to user space, the other when
it goes to sleep and there is no higher priority process.
The machine check handler will schedule both, and whoever runs first
will grab the event. This is done because quick reaction to this
event is critical to avoid a potential more fatal machine check
when the corruption is consumed.
There is a simple lock less ring buffer to queue the corrupted
addresses between the exception handler and the process context handler.
Then in process context it just calls the high level VM code with
the corrupted PFNs.
The code adds the required code to extract the failed address from
the CPU's machine check registers. It doesn't try to handle all
possible cases -- the specification has 6 different ways to specify
memory address -- but only the linear address.
Most of the required checking has been already done earlier in the
mce_severity rule checking engine. Following the Intel
recommendations Action Optional errors are only enabled for known
situations (encoded in MCACODs). The errors are ignored otherwise,
because they are action optional.
v2: Improve comment, disable preemption while processing ring buffer
(reported by Ying Huang)
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-05-27 19:56:59 +00:00
|
|
|
mce_notify_process();
|
2008-09-24 00:21:45 +00:00
|
|
|
#endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
|
|
|
|
|
|
uprobes/core: Handle breakpoint and singlestep exceptions
Uprobes uses exception notifiers to get to know if a thread hit
a breakpoint or a singlestep exception.
When a thread hits a uprobe or is singlestepping post a uprobe
hit, the uprobe exception notifier sets its TIF_UPROBE bit,
which will then be checked on its return to userspace path
(do_notify_resume() ->uprobe_notify_resume()), where the
consumers handlers are run (in task context) based on the
defined filters.
Uprobe hits are thread specific and hence we need to maintain
information about if a task hit a uprobe, what uprobe was hit,
the slot where the original instruction was copied for xol so
that it can be singlestepped with appropriate fixups.
In some cases, special care is needed for instructions that are
executed out of line (xol). These are architecture specific
artefacts, such as handling RIP relative instructions on x86_64.
Since the instruction at which the uprobe was inserted is
executed out of line, architecture specific fixups are added so
that the thread continues normal execution in the presence of a
uprobe.
Postpone the signals until we execute the probed insn.
post_xol() path does a recalc_sigpending() before return to
user-mode, this ensures the signal can't be lost.
Uprobes relies on DIE_DEBUG notification to notify if a
singlestep is complete.
Adds x86 specific uprobe exception notifiers and appropriate
hooks needed to determine a uprobe hit and subsequent post
processing.
Add requisite x86 fixups for xol for uprobes. Specific cases
needing fixups include relative jumps (x86_64), calls, etc.
Where possible, we check and skip singlestepping the
breakpointed instructions. For now we skip single byte as well
as few multibyte nop instructions. However this can be extended
to other instructions too.
Credits to Oleg Nesterov for suggestions/patches related to
signal, breakpoint, singlestep handling code.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com>
Cc: Linux-mm <linux-mm@kvack.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120313180011.29771.89027.sendpatchset@srdronam.in.ibm.com
[ Performed various cleanliness edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2012-03-13 18:00:11 +00:00
|
|
|
if (thread_info_flags & _TIF_UPROBE) {
|
|
|
|
|
clear_thread_flag(TIF_UPROBE);
|
|
|
|
|
uprobe_notify_resume(regs);
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* deal with pending signal delivery */
|
2008-04-30 07:53:10 +00:00
|
|
|
if (thread_info_flags & _TIF_SIGPENDING)
|
2006-01-19 01:44:00 +00:00
|
|
|
do_signal(regs);
|
2008-01-25 20:08:29 +00:00
|
|
|
|
2008-04-20 02:10:57 +00:00
|
|
|
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
|
|
|
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
|
|
|
tracehook_notify_resume(regs);
|
|
|
|
|
}
|
2009-09-19 06:40:22 +00:00
|
|
|
if (thread_info_flags & _TIF_USER_RETURN_NOTIFY)
|
|
|
|
|
fire_user_return_notifiers();
|
2008-04-20 02:10:57 +00:00
|
|
|
|
2008-09-24 00:21:45 +00:00
|
|
|
#ifdef CONFIG_X86_32
|
2005-04-16 22:20:36 +00:00
|
|
|
clear_thread_flag(TIF_IRET);
|
2008-09-24 00:21:45 +00:00
|
|
|
#endif /* CONFIG_X86_32 */
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-09-05 23:27:11 +00:00
|
|
|
|
|
|
|
|
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
|
|
|
|
|
{
|
|
|
|
|
struct task_struct *me = current;
|
|
|
|
|
|
|
|
|
|
if (show_unhandled_signals && printk_ratelimit()) {
|
2008-12-16 22:02:16 +00:00
|
|
|
printk("%s"
|
2008-09-05 23:27:11 +00:00
|
|
|
"%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
|
2008-12-16 22:02:16 +00:00
|
|
|
task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
|
2008-09-05 23:27:11 +00:00
|
|
|
me->comm, me->pid, where, frame,
|
|
|
|
|
regs->ip, regs->sp, regs->orig_ax);
|
|
|
|
|
print_vma_addr(" in ", regs->ip);
|
2012-05-22 02:50:07 +00:00
|
|
|
pr_cont("\n");
|
2008-09-05 23:27:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
force_sig(SIGSEGV, me);
|
|
|
|
|
}
|
2012-02-19 17:41:09 +00:00
|
|
|
|
|
|
|
|
#ifdef CONFIG_X86_X32_ABI
|
|
|
|
|
static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
|
|
|
|
|
siginfo_t *info, compat_sigset_t *set,
|
|
|
|
|
struct pt_regs *regs)
|
|
|
|
|
{
|
|
|
|
|
struct rt_sigframe_x32 __user *frame;
|
|
|
|
|
void __user *restorer;
|
|
|
|
|
int err = 0;
|
|
|
|
|
void __user *fpstate = NULL;
|
|
|
|
|
|
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
|
|
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO) {
|
|
|
|
|
if (copy_siginfo_to_user32(&frame->info, info))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
put_user_try {
|
|
|
|
|
/* Create the ucontext. */
|
|
|
|
|
if (cpu_has_xsave)
|
|
|
|
|
put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
|
|
|
|
|
else
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_flags);
|
|
|
|
|
put_user_ex(0, &frame->uc.uc_link);
|
|
|
|
|
put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
|
|
|
put_user_ex(sas_ss_flags(regs->sp),
|
|
|
|
|
&frame->uc.uc_stack.ss_flags);
|
|
|
|
|
put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
|
|
|
put_user_ex(0, &frame->uc.uc__pad0);
|
|
|
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
|
|
|
|
|
regs, set->sig[0]);
|
|
|
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
|
|
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
|
|
|
restorer = ka->sa.sa_restorer;
|
|
|
|
|
} else {
|
|
|
|
|
/* could use a vstub here */
|
|
|
|
|
restorer = NULL;
|
|
|
|
|
err |= -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
put_user_ex(restorer, &frame->pretcode);
|
|
|
|
|
} put_user_catch(err);
|
|
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
|
|
|
|
regs->sp = (unsigned long) frame;
|
|
|
|
|
regs->ip = (unsigned long) ka->sa.sa_handler;
|
|
|
|
|
|
|
|
|
|
/* We use the x32 calling convention here... */
|
|
|
|
|
regs->di = sig;
|
|
|
|
|
regs->si = (unsigned long) &frame->info;
|
|
|
|
|
regs->dx = (unsigned long) &frame->uc;
|
|
|
|
|
|
|
|
|
|
loadsegment(ds, __USER_DS);
|
|
|
|
|
loadsegment(es, __USER_DS);
|
|
|
|
|
|
|
|
|
|
regs->cs = __USER_CS;
|
|
|
|
|
regs->ss = __USER_DS;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
|
|
|
|
|
{
|
|
|
|
|
struct rt_sigframe_x32 __user *frame;
|
|
|
|
|
sigset_t set;
|
|
|
|
|
unsigned long ax;
|
|
|
|
|
struct pt_regs tregs;
|
|
|
|
|
|
|
|
|
|
frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
|
|
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
|
|
|
goto badframe;
|
|
|
|
|
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
|
|
set_current_blocked(&set);
|
|
|
|
|
|
|
|
|
|
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
|
|
tregs = *regs;
|
|
|
|
|
if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
|
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
|
|
return ax;
|
|
|
|
|
|
|
|
|
|
badframe:
|
|
|
|
|
signal_fault(regs, frame, "x32 rt_sigreturn");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
