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| author | Will Deacon <will.deacon@arm.com> | 2019-02-26 17:35:00 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-09 13:21:13 +0300 |
| commit | a22d570aee77ae626e4d3532478ae8058a24bdb3 (patch) | |
| tree | 0e56e10e67dab8e3cc56fa4add1aa28c2c146e65 /arch/arm64/kernel/probes | |
| parent | 26a04d84bc5311d7785b229b353f327e866ab61a (diff) | |
| download | linux-a22d570aee77ae626e4d3532478ae8058a24bdb3.tar.xz | |
arm64: kprobes: Avoid calling kprobes debug handlers explicitly
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>
Diffstat (limited to 'arch/arm64/kernel/probes')
| -rw-r--r-- | arch/arm64/kernel/probes/kprobes.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 7a679caf4585..baf97f47aec0 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -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; } |