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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2017-11-24 23:54:22 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-17 22:14:21 +0000 |
| commit | c608906165355089a4de3c9133c72e81e011096c (patch) | |
| tree | cc1a76bc86bdcc8f0e69e4e3cb7874dcfccd26d2 /arch/arm/kernel/traps.c | |
| parent | 75fea300d73ae5b18957949a53ec770daaeb6fc2 (diff) | |
| download | linux-c608906165355089a4de3c9133c72e81e011096c.tar.gz linux-c608906165355089a4de3c9133c72e81e011096c.tar.bz2 linux-c608906165355089a4de3c9133c72e81e011096c.zip | |
ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code
Avoid adding kprobes to any of the kernel entry/exit or startup
assembly code, or code in the identity-mapped region. This code does
not conform to the standard C conventions, which means that the
expectations of the kprobes code is not forfilled.
Placing kprobes at some of these locations results in the kernel trying
to return to userspace addresses while retaining the CPU in kernel mode.
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/kernel/traps.c')
| -rw-r--r-- | arch/arm/kernel/traps.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 5cf04888c581..e344bdd2e5ac 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -72,7 +72,7 @@ void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from); #endif - if (in_exception_text(where)) + if (in_entry_text(from)) dump_mem("", "Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs)); } @@ -433,7 +433,7 @@ static int call_undef_hook(struct pt_regs *regs, unsigned int instr) return fn ? fn(regs, instr) : 1; } -asmlinkage void __exception do_undefinstr(struct pt_regs *regs) +asmlinkage void do_undefinstr(struct pt_regs *regs) { unsigned int instr; siginfo_t info; |