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[PATCH] Kprobes: prevent possible race conditions ia64 changes

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This patch contains the ia64 architecture specific changes to prevent the
possible race conditions.

Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Prasanna S Panchamukhi 2005-09-06 15:19:30 -07:00 committed by Linus Torvalds
parent bb144a85c7
commit 1f7ad57b75
6 changed files with 41 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/ia64/kernel/jprobes.S
View File

@ -49,6 +49,7 @@
/*
* void jprobe_break(void)
*/
.section .kprobes.text, "ax"
ENTRY(jprobe_break)
break.m 0x80300
END(jprobe_break)

57
arch/ia64/kernel/kprobes.c
View File

@ -87,8 +87,10 @@ static enum instruction_type bundle_encoding[32][3] = {
* is IP relative instruction and update the kprobe
* inst flag accordingly
*/
static void update_kprobe_inst_flag(uint template, uint slot, uint major_opcode,
unsigned long kprobe_inst, struct kprobe *p)
static void __kprobes update_kprobe_inst_flag(uint template, uint slot,
uint major_opcode,
unsigned long kprobe_inst,
struct kprobe *p)
{
p->ainsn.inst_flag = 0;
p->ainsn.target_br_reg = 0;
@ -126,8 +128,10 @@ static void update_kprobe_inst_flag(uint template, uint slot, uint major_opcode
* Returns 0 if supported
* Returns -EINVAL if unsupported
*/
static int unsupported_inst(uint template, uint slot, uint major_opcode,
unsigned long kprobe_inst, struct kprobe *p)
static int __kprobes unsupported_inst(uint template, uint slot,
uint major_opcode,
unsigned long kprobe_inst,
struct kprobe *p)
{
unsigned long addr = (unsigned long)p->addr;
@ -168,8 +172,9 @@ static int unsupported_inst(uint template, uint slot, uint major_opcode,
* on which we are inserting kprobe is cmp instruction
* with ctype as unc.
*/
static uint is_cmp_ctype_unc_inst(uint template, uint slot, uint major_opcode,
unsigned long kprobe_inst)
static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot,
uint major_opcode,
unsigned long kprobe_inst)
{
cmp_inst_t cmp_inst;
uint ctype_unc = 0;
@ -201,8 +206,10 @@ out:
* In this function we override the bundle with
* the break instruction at the given slot.
*/
static void prepare_break_inst(uint template, uint slot, uint major_opcode,
unsigned long kprobe_inst, struct kprobe *p)
static void __kprobes prepare_break_inst(uint template, uint slot,
uint major_opcode,
unsigned long kprobe_inst,
struct kprobe *p)
{
unsigned long break_inst = BREAK_INST;
bundle_t *bundle = &p->ainsn.insn.bundle;
@ -271,7 +278,8 @@ static inline int in_ivt_functions(unsigned long addr)
&& addr < (unsigned long)__end_ivt_text);
}
static int valid_kprobe_addr(int template, int slot, unsigned long addr)
static int __kprobes valid_kprobe_addr(int template, int slot,
unsigned long addr)
{
if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) {
printk(KERN_WARNING "Attempting to insert unaligned kprobe "
@ -323,7 +331,7 @@ static void kretprobe_trampoline(void)
* - cleanup by marking the instance as unused
* - long jump back to the original return address
*/
int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kretprobe_instance *ri = NULL;
struct hlist_head *head;
@ -381,7 +389,8 @@ int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
return 1;
}
void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs)
void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
{
struct kretprobe_instance *ri;
@ -399,7 +408,7 @@ void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs)
}
}
int arch_prepare_kprobe(struct kprobe *p)
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
unsigned long addr = (unsigned long) p->addr;
unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL);
@ -430,7 +439,7 @@ int arch_prepare_kprobe(struct kprobe *p)
return 0;
}
void arch_arm_kprobe(struct kprobe *p)
void __kprobes arch_arm_kprobe(struct kprobe *p)
{
unsigned long addr = (unsigned long)p->addr;
unsigned long arm_addr = addr & ~0xFULL;
@ -439,7 +448,7 @@ void arch_arm_kprobe(struct kprobe *p)
flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
}
void arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_disarm_kprobe(struct kprobe *p)
{
unsigned long addr = (unsigned long)p->addr;
unsigned long arm_addr = addr & ~0xFULL;
@ -449,7 +458,7 @@ void arch_disarm_kprobe(struct kprobe *p)
flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
}
void arch_remove_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
}
@ -461,7 +470,7 @@ void arch_remove_kprobe(struct kprobe *p)
* to original stack address, handle the case where we need to fixup the
* relative IP address and/or fixup branch register.
*/
static void resume_execution(struct kprobe *p, struct pt_regs *regs)
static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
{
unsigned long bundle_addr = ((unsigned long) (&p->opcode.bundle)) & ~0xFULL;
unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL;
@ -528,7 +537,7 @@ turn_ss_off:
ia64_psr(regs)->ss = 0;
}
static void prepare_ss(struct kprobe *p, struct pt_regs *regs)
static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs)
{
unsigned long bundle_addr = (unsigned long) &p->opcode.bundle;
unsigned long slot = (unsigned long)p->addr & 0xf;
@ -545,7 +554,7 @@ static void prepare_ss(struct kprobe *p, struct pt_regs *regs)
ia64_psr(regs)->ss = 1;
}
static int pre_kprobes_handler(struct die_args *args)
static int __kprobes pre_kprobes_handler(struct die_args *args)
{
struct kprobe *p;
int ret = 0;
@ -616,7 +625,7 @@ no_kprobe:
return ret;
}
static int post_kprobes_handler(struct pt_regs *regs)
static int __kprobes post_kprobes_handler(struct pt_regs *regs)
{
if (!kprobe_running())
return 0;
@ -641,7 +650,7 @@ out:
return 1;
}
static int kprobes_fault_handler(struct pt_regs *regs, int trapnr)
static int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
{
if (!kprobe_running())
return 0;
@ -659,8 +668,8 @@ static int kprobes_fault_handler(struct pt_regs *regs, int trapnr)
return 0;
}
int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
void *data)
int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct die_args *args = (struct die_args *)data;
switch(val) {
@ -681,7 +690,7 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
return NOTIFY_DONE;
}
int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct jprobe *jp = container_of(p, struct jprobe, kp);
unsigned long addr = ((struct fnptr *)(jp->entry))->ip;
@ -703,7 +712,7 @@ int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
return 1;
}
int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
{
*regs = jprobe_saved_regs;
return 1;

5
arch/ia64/kernel/traps.c
View File

@ -15,6 +15,7 @@
#include <linux/vt_kern.h> /* For unblank_screen() */
#include <linux/module.h> /* for EXPORT_SYMBOL */
#include <linux/hardirq.h>
#include <linux/kprobes.h>
#include <asm/fpswa.h>
#include <asm/ia32.h>
@ -122,7 +123,7 @@ die_if_kernel (char *str, struct pt_regs *regs, long err)
}
void
ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
{
siginfo_t siginfo;
int sig, code;
@ -444,7 +445,7 @@ ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
return rv;
}
void
void __kprobes
ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
unsigned long iim, unsigned long itir, long arg5, long arg6,
long arg7, struct pt_regs regs)

1
arch/ia64/kernel/vmlinux.lds.S
View File

@ -48,6 +48,7 @@ SECTIONS
*(.text)
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
*(.gnu.linkonce.t*)
}
.text2 : AT(ADDR(.text2) - LOAD_OFFSET)

1
arch/ia64/lib/flush.S
View File

@ -20,6 +20,7 @@
*
* Note: "in0" and "in1" are preserved for debugging purposes.
*/
.section .kprobes.text,"ax"
GLOBAL_ENTRY(flush_icache_range)
.prologue

3
arch/ia64/mm/fault.c
View File

@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kprobes.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
@ -76,7 +77,7 @@ mapped_kernel_page_is_present (unsigned long address)
return pte_present(pte);
}
void
void __kprobes
ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *regs)
{
int signal = SIGSEGV, code = SEGV_MAPERR;