diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2018-05-13 07:04:16 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-19 13:35:56 +0300 |
| commit | eb0146daefdde65665b7f076fbff7b49dade95b9 (patch) | |
| tree | b7e478904c9cd985c4349977d67b92178369392d | |
| parent | 70948c05fdde0aac32f9667856a88725c192fa40 (diff) | |
| download | linux-eb0146daefdde65665b7f076fbff7b49dade95b9.tar.xz | |
ARM: 8771/1: kprobes: Prohibit kprobes on do_undefinstr
Prohibit kprobes on do_undefinstr because kprobes on
arm is implemented by undefined instruction. This means
if we probe do_undefinstr(), it can cause infinit
recursive exception.
Fixes: 24ba613c9d6c ("ARM kprobes: core code")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | arch/arm/kernel/traps.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 5e3633c24e63..2fe87109ae46 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -19,6 +19,7 @@ #include <linux/uaccess.h> #include <linux/hardirq.h> #include <linux/kdebug.h> +#include <linux/kprobes.h> #include <linux/module.h> #include <linux/kexec.h> #include <linux/bug.h> @@ -417,7 +418,8 @@ void unregister_undef_hook(struct undef_hook *hook) raw_spin_unlock_irqrestore(&undef_lock, flags); } -static int call_undef_hook(struct pt_regs *regs, unsigned int instr) +static nokprobe_inline +int call_undef_hook(struct pt_regs *regs, unsigned int instr) { struct undef_hook *hook; unsigned long flags; @@ -490,6 +492,7 @@ die_sig: arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6); } +NOKPROBE_SYMBOL(do_undefinstr) /* * Handle FIQ similarly to NMI on x86 systems. |