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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-15 09:27:04 +0000 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-15 09:27:04 +0000 |
commit | d5996b2ff0e26cf7ed4c103084a2d6fc569e7216 (patch) | |
tree | c4d50df299e9c0e07e8ae66406489c01f4c9d6a9 /arch/arm/Kconfig | |
parent | 671289c2872cfc050954ac1dd3131429fca30aad (diff) | |
download | op-kernel-dev-d5996b2ff0e26cf7ed4c103084a2d6fc569e7216.zip op-kernel-dev-d5996b2ff0e26cf7ed4c103084a2d6fc569e7216.tar.gz |
ARM: fix /proc/$PID/stack on SMP
Rabin Vincent reports:
| On SMP, this BUG() in save_stack_trace_tsk() can be easily triggered
| from user space by reading /proc/$PID/stack, where $PID is any pid but
| the current process:
|
| if (tsk != current) {
| #ifdef CONFIG_SMP
| /*
| * What guarantees do we have here that 'tsk'
| * is not running on another CPU?
| */
| BUG();
| #else
Fix this by replacing the BUG() with an entry to terminate the stack
trace, returning an empty trace - I'd rather not expose the dwarf
unwinder to a volatile stack of a running thread.
Reported-by: Rabin Vincent <rabin@rab.in>
Tested-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
0 files changed, 0 insertions, 0 deletions