lkml.org 
[lkml]   [2013]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on func_ptr_is_kernel_text
From
Date
Prohibit probing on func_ptr_is_kernel_text().
Since the func_ptr_is_kernel_text() is called from
notifier_call_chain() which is called from int3 handler,
probing it may cause double int3 fault and kernel will
reboot.

This happenes when the kernel built with CONFIG_DEBUG_NOTIFIERS=y.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Ingo Molnar <mingo@kernel.org>
---
kernel/extable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 832cb28..022fb25 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -129,7 +129,7 @@ int kernel_text_address(unsigned long addr)
* pointer is part of the kernel text, we need to do some
* special dereferencing first.
*/
-int func_ptr_is_kernel_text(void *ptr)
+int nokprobe func_ptr_is_kernel_text(void *ptr)
{
unsigned long addr;
addr = (unsigned long) dereference_function_descriptor(ptr);

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-11-01 12:41    [W:0.083 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site