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arm64: kprobes: Avoid calling kprobes debug handlers explicitly

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Kprobes bypasses our debug hook registration code so that it doesn't
get tangled up with recursive debug exceptions from things like lockdep:

  http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/324385.html

However, since then, (a) the hook list has become RCU protected and (b)
the kprobes hooks were found not to filter out exceptions from userspace
correctly. On top of that, the step handler is invoked directly from
single_step_handler(), which *does* use the debug hook list, so it's
clearly not the end of the world.

For now, have kprobes use the debug hook registration API like everybody
else. We can revisit this in the future if this is found to limit
coverage significantly.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2019-02-26 14:35:00 +00:00
parent 26a04d84bc
commit a22d570aee
3 changed files with 14 additions and 14 deletions
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2
arch/arm64/include/asm/kprobes.h
View File

@ -54,8 +54,6 @@ void arch_remove_kprobe(struct kprobe *);
int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
int kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data);
int kprobe_breakpoint_handler(struct pt_regs *regs, unsigned int esr);
int kprobe_single_step_handler(struct pt_regs *regs, unsigned int esr);
void kretprobe_trampoline(void);
void __kprobes *trampoline_probe_handler(struct pt_regs *regs);

10
arch/arm64/kernel/debug-monitors.c
View File

@ -258,10 +258,6 @@ static int single_step_handler(unsigned long unused, unsigned int esr,
if (!reinstall_suspended_bps(regs))
return 0;
#ifdef CONFIG_KPROBES
if (kprobe_single_step_handler(regs, esr) == DBG_HOOK_HANDLED)
handler_found = true;
#endif
if (!handler_found && call_step_hook(regs, esr) == DBG_HOOK_HANDLED)
handler_found = true;
@ -337,12 +333,6 @@ static int brk_handler(unsigned long unused, unsigned int esr,
{
bool handler_found = false;
#ifdef CONFIG_KPROBES
if ((esr & BRK64_ESR_MASK) == BRK64_ESR_KPROBES) {
if (kprobe_breakpoint_handler(regs, esr) == DBG_HOOK_HANDLED)
handler_found = true;
}
#endif
if (!handler_found && call_break_hook(regs, esr) == DBG_HOOK_HANDLED)
handler_found = true;

16
arch/arm64/kernel/probes/kprobes.c
View File

@ -439,7 +439,7 @@ kprobe_ss_hit(struct kprobe_ctlblk *kcb, unsigned long addr)
return DBG_HOOK_ERROR;
}
int __kprobes
static int __kprobes
kprobe_single_step_handler(struct pt_regs *regs, unsigned int esr)
{
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@ -461,7 +461,11 @@ kprobe_single_step_handler(struct pt_regs *regs, unsigned int esr)
return retval;
}
int __kprobes
static struct step_hook kprobes_step_hook = {
.fn = kprobe_single_step_handler,
};
static int __kprobes
kprobe_breakpoint_handler(struct pt_regs *regs, unsigned int esr)
{
if (user_mode(regs))
@ -471,6 +475,11 @@ kprobe_breakpoint_handler(struct pt_regs *regs, unsigned int esr)
return DBG_HOOK_HANDLED;
}
static struct break_hook kprobes_break_hook = {
.imm = BRK64_ESR_KPROBES,
.fn = kprobe_breakpoint_handler,
};
/*
* Provide a blacklist of symbols identifying ranges which cannot be kprobed.
* This blacklist is exposed to userspace via debugfs (kprobes/blacklist).
@ -599,5 +608,8 @@ int __kprobes arch_trampoline_kprobe(struct kprobe *p)
int __init arch_init_kprobes(void)
{
register_kernel_break_hook(&kprobes_break_hook);
register_kernel_step_hook(&kprobes_step_hook);
return 0;
}