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9d42d48a34
The native (64-bit) sigval_t union contains sival_int (32-bit) and sival_ptr (64-bit). When a compat application invokes a syscall that takes a sigval_t value (as part of a larger structure, e.g. compat_sys_mq_notify, compat_sys_timer_create), the compat_sigval_t union is converted to the native sigval_t with sival_int overlapping with either the least or the most significant half of sival_ptr, depending on endianness. When the corresponding signal is delivered to a compat application, on big endian the current (compat_uptr_t)sival_ptr cast always returns 0 since sival_int corresponds to the top part of sival_ptr. This patch fixes copy_siginfo_to_user32() so that sival_int is copied to the compat_siginfo_t structure. Cc: <stable@vger.kernel.org> Reported-by: Bamvor Jian Zhang <bamvor.zhangjian@huawei.com> Tested-by: Bamvor Jian Zhang <bamvor.zhangjian@huawei.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
578 lines
16 KiB
C
578 lines
16 KiB
C
/*
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* Based on arch/arm/kernel/signal.c
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*
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* Copyright (C) 1995-2009 Russell King
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* Copyright (C) 2012 ARM Ltd.
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* Modified by Will Deacon <will.deacon@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/compat.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/ratelimit.h>
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#include <asm/esr.h>
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#include <asm/fpsimd.h>
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#include <asm/signal32.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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struct compat_sigcontext {
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/* We always set these two fields to 0 */
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compat_ulong_t trap_no;
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compat_ulong_t error_code;
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compat_ulong_t oldmask;
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compat_ulong_t arm_r0;
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compat_ulong_t arm_r1;
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compat_ulong_t arm_r2;
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compat_ulong_t arm_r3;
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compat_ulong_t arm_r4;
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compat_ulong_t arm_r5;
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compat_ulong_t arm_r6;
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compat_ulong_t arm_r7;
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compat_ulong_t arm_r8;
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compat_ulong_t arm_r9;
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compat_ulong_t arm_r10;
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compat_ulong_t arm_fp;
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compat_ulong_t arm_ip;
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compat_ulong_t arm_sp;
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compat_ulong_t arm_lr;
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compat_ulong_t arm_pc;
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compat_ulong_t arm_cpsr;
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compat_ulong_t fault_address;
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};
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struct compat_ucontext {
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compat_ulong_t uc_flags;
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compat_uptr_t uc_link;
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compat_stack_t uc_stack;
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struct compat_sigcontext uc_mcontext;
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compat_sigset_t uc_sigmask;
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int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
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compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8)));
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};
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struct compat_vfp_sigframe {
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compat_ulong_t magic;
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compat_ulong_t size;
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struct compat_user_vfp {
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compat_u64 fpregs[32];
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compat_ulong_t fpscr;
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} ufp;
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struct compat_user_vfp_exc {
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compat_ulong_t fpexc;
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compat_ulong_t fpinst;
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compat_ulong_t fpinst2;
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} ufp_exc;
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} __attribute__((__aligned__(8)));
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#define VFP_MAGIC 0x56465001
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#define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe)
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#define FSR_WRITE_SHIFT (11)
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struct compat_aux_sigframe {
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struct compat_vfp_sigframe vfp;
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/* Something that isn't a valid magic number for any coprocessor. */
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unsigned long end_magic;
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} __attribute__((__aligned__(8)));
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struct compat_sigframe {
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struct compat_ucontext uc;
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compat_ulong_t retcode[2];
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};
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struct compat_rt_sigframe {
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struct compat_siginfo info;
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struct compat_sigframe sig;
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};
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
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{
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compat_sigset_t cset;
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cset.sig[0] = set->sig[0] & 0xffffffffull;
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cset.sig[1] = set->sig[0] >> 32;
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return copy_to_user(uset, &cset, sizeof(*uset));
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}
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static inline int get_sigset_t(sigset_t *set,
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const compat_sigset_t __user *uset)
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{
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compat_sigset_t s32;
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if (copy_from_user(&s32, uset, sizeof(*uset)))
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return -EFAULT;
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set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
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return 0;
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}
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
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{
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int err;
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if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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* this code is fixed accordingly.
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* It should never copy any pad contained in the structure
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* to avoid security leaks, but must copy the generic
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* 3 ints plus the relevant union member.
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* This routine must convert siginfo from 64bit to 32bit as well
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* at the same time.
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*/
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
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SI_PAD_SIZE);
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else switch (from->si_code & __SI_MASK) {
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case __SI_KILL:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_TIMER:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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case __SI_POLL:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_FAULT:
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err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
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&to->si_addr);
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#ifdef BUS_MCEERR_AO
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/*
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* Other callers might not initialize the si_lsb field,
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* so check explicitely for the right codes here.
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*/
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if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
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err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
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#endif
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break;
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case __SI_CHLD:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_status, &to->si_status);
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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break;
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case __SI_RT: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ: /* But this is */
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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case __SI_SYS:
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err |= __put_user((compat_uptr_t)(unsigned long)
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from->si_call_addr, &to->si_call_addr);
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err |= __put_user(from->si_syscall, &to->si_syscall);
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err |= __put_user(from->si_arch, &to->si_arch);
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break;
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default: /* this is just in case for now ... */
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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}
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return err;
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}
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int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
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{
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memset(to, 0, sizeof *to);
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if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
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copy_from_user(to->_sifields._pad,
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from->_sifields._pad, SI_PAD_SIZE))
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return -EFAULT;
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return 0;
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}
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/*
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* VFP save/restore code.
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*/
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static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
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{
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struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state;
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compat_ulong_t magic = VFP_MAGIC;
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compat_ulong_t size = VFP_STORAGE_SIZE;
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compat_ulong_t fpscr, fpexc;
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int err = 0;
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/*
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* Save the hardware registers to the fpsimd_state structure.
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* Note that this also saves V16-31, which aren't visible
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* in AArch32.
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*/
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fpsimd_preserve_current_state();
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/* Place structure header on the stack */
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__put_user_error(magic, &frame->magic, err);
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__put_user_error(size, &frame->size, err);
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/*
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* Now copy the FP registers. Since the registers are packed,
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* we can copy the prefix we want (V0-V15) as it is.
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* FIXME: Won't work if big endian.
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*/
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err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
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sizeof(frame->ufp.fpregs));
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/* Create an AArch32 fpscr from the fpsr and the fpcr. */
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fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
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(fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
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__put_user_error(fpscr, &frame->ufp.fpscr, err);
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/*
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* The exception register aren't available so we fake up a
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* basic FPEXC and zero everything else.
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*/
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fpexc = (1 << 30);
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__put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
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__put_user_error(0, &frame->ufp_exc.fpinst, err);
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__put_user_error(0, &frame->ufp_exc.fpinst2, err);
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return err ? -EFAULT : 0;
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}
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static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
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{
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struct fpsimd_state fpsimd;
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compat_ulong_t magic = VFP_MAGIC;
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compat_ulong_t size = VFP_STORAGE_SIZE;
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compat_ulong_t fpscr;
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int err = 0;
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__get_user_error(magic, &frame->magic, err);
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__get_user_error(size, &frame->size, err);
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if (err)
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return -EFAULT;
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if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
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return -EINVAL;
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/*
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* Copy the FP registers into the start of the fpsimd_state.
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* FIXME: Won't work if big endian.
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*/
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err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
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sizeof(frame->ufp.fpregs));
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/* Extract the fpsr and the fpcr from the fpscr */
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__get_user_error(fpscr, &frame->ufp.fpscr, err);
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fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
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fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
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/*
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* We don't need to touch the exception register, so
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* reload the hardware state.
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*/
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if (!err)
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fpsimd_update_current_state(&fpsimd);
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return err ? -EFAULT : 0;
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}
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static int compat_restore_sigframe(struct pt_regs *regs,
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struct compat_sigframe __user *sf)
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{
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int err;
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sigset_t set;
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struct compat_aux_sigframe __user *aux;
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err = get_sigset_t(&set, &sf->uc.uc_sigmask);
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if (err == 0) {
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sigdelsetmask(&set, ~_BLOCKABLE);
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set_current_blocked(&set);
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}
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__get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
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__get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
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__get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
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__get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
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__get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
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__get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
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__get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
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__get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
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__get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
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__get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
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__get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
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__get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
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__get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
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__get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
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__get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
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__get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
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__get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
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/*
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* Avoid compat_sys_sigreturn() restarting.
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*/
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regs->syscallno = ~0UL;
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err |= !valid_user_regs(®s->user_regs);
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aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
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if (err == 0)
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err |= compat_restore_vfp_context(&aux->vfp);
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return err;
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}
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asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
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{
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struct compat_sigframe __user *frame;
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/* Always make any pending restarted system calls return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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/*
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* Since we stacked the signal on a 64-bit boundary,
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* then 'sp' should be word aligned here. If it's
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* not, then the user is trying to mess with us.
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*/
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if (regs->compat_sp & 7)
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goto badframe;
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frame = (struct compat_sigframe __user *)regs->compat_sp;
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if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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goto badframe;
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if (compat_restore_sigframe(regs, frame))
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goto badframe;
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return regs->regs[0];
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badframe:
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if (show_unhandled_signals)
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pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
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current->comm, task_pid_nr(current), __func__,
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regs->pc, regs->sp);
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force_sig(SIGSEGV, current);
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return 0;
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}
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asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
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{
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struct compat_rt_sigframe __user *frame;
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/* Always make any pending restarted system calls return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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/*
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* Since we stacked the signal on a 64-bit boundary,
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* then 'sp' should be word aligned here. If it's
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* not, then the user is trying to mess with us.
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*/
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if (regs->compat_sp & 7)
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goto badframe;
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frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
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if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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goto badframe;
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if (compat_restore_sigframe(regs, &frame->sig))
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goto badframe;
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if (compat_restore_altstack(&frame->sig.uc.uc_stack))
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goto badframe;
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return regs->regs[0];
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badframe:
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if (show_unhandled_signals)
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pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
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current->comm, task_pid_nr(current), __func__,
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regs->pc, regs->sp);
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force_sig(SIGSEGV, current);
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return 0;
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}
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static void __user *compat_get_sigframe(struct ksignal *ksig,
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struct pt_regs *regs,
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int framesize)
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{
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compat_ulong_t sp = sigsp(regs->compat_sp, ksig);
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void __user *frame;
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/*
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* ATPCS B01 mandates 8-byte alignment
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*/
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frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
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/*
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* Check that we can actually write to the signal frame.
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*/
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if (!access_ok(VERIFY_WRITE, frame, framesize))
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frame = NULL;
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return frame;
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}
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static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
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compat_ulong_t __user *rc, void __user *frame,
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int usig)
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{
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compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
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compat_ulong_t retcode;
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compat_ulong_t spsr = regs->pstate & ~(PSR_f | COMPAT_PSR_E_BIT);
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int thumb;
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/* Check if the handler is written for ARM or Thumb */
|
|
thumb = handler & 1;
|
|
|
|
if (thumb)
|
|
spsr |= COMPAT_PSR_T_BIT;
|
|
else
|
|
spsr &= ~COMPAT_PSR_T_BIT;
|
|
|
|
/* The IT state must be cleared for both ARM and Thumb-2 */
|
|
spsr &= ~COMPAT_PSR_IT_MASK;
|
|
|
|
/* Restore the original endianness */
|
|
spsr |= COMPAT_PSR_ENDSTATE;
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
retcode = ptr_to_compat(ka->sa.sa_restorer);
|
|
} else {
|
|
/* Set up sigreturn pointer */
|
|
unsigned int idx = thumb << 1;
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
idx += 3;
|
|
|
|
retcode = AARCH32_VECTORS_BASE +
|
|
AARCH32_KERN_SIGRET_CODE_OFFSET +
|
|
(idx << 2) + thumb;
|
|
}
|
|
|
|
regs->regs[0] = usig;
|
|
regs->compat_sp = ptr_to_compat(frame);
|
|
regs->compat_lr = retcode;
|
|
regs->pc = handler;
|
|
regs->pstate = spsr;
|
|
}
|
|
|
|
static int compat_setup_sigframe(struct compat_sigframe __user *sf,
|
|
struct pt_regs *regs, sigset_t *set)
|
|
{
|
|
struct compat_aux_sigframe __user *aux;
|
|
int err = 0;
|
|
|
|
__put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
|
|
__put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
|
|
__put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
|
|
__put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
|
|
__put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
|
|
__put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
|
|
__put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
|
|
__put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
|
|
__put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
|
|
__put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
|
|
__put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
|
|
__put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
|
|
__put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
|
|
__put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
|
|
__put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
|
|
__put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
|
|
__put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
|
|
|
|
__put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
|
|
/* set the compat FSR WnR */
|
|
__put_user_error(!!(current->thread.fault_code & ESR_ELx_WNR) <<
|
|
FSR_WRITE_SHIFT, &sf->uc.uc_mcontext.error_code, err);
|
|
__put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
|
|
__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
|
|
|
|
err |= put_sigset_t(&sf->uc.uc_sigmask, set);
|
|
|
|
aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
|
|
|
|
if (err == 0)
|
|
err |= compat_preserve_vfp_context(&aux->vfp);
|
|
__put_user_error(0, &aux->end_magic, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 32-bit signal handling routines called from signal.c
|
|
*/
|
|
int compat_setup_rt_frame(int usig, struct ksignal *ksig,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct compat_rt_sigframe __user *frame;
|
|
int err = 0;
|
|
|
|
frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
|
|
|
|
__put_user_error(0, &frame->sig.uc.uc_flags, err);
|
|
__put_user_error(0, &frame->sig.uc.uc_link, err);
|
|
|
|
err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
|
|
|
|
err |= compat_setup_sigframe(&frame->sig, regs, set);
|
|
|
|
if (err == 0) {
|
|
compat_setup_return(regs, &ksig->ka, frame->sig.retcode, frame, usig);
|
|
regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
|
|
regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int compat_setup_frame(int usig, struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct compat_sigframe __user *frame;
|
|
int err = 0;
|
|
|
|
frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
__put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
|
|
|
|
err |= compat_setup_sigframe(frame, regs, set);
|
|
if (err == 0)
|
|
compat_setup_return(regs, &ksig->ka, frame->retcode, frame, usig);
|
|
|
|
return err;
|
|
}
|
|
|
|
void compat_setup_restart_syscall(struct pt_regs *regs)
|
|
{
|
|
regs->regs[7] = __NR_compat_restart_syscall;
|
|
}
|