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bug: Annotate WARN/BUG/stackfail as noinstr safe

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Warnings, bugs and stack protection fails from noinstr sections, e.g. low
level and early entry code, are likely to be fatal.

Mark them as "safe" to be invoked from noinstr protected code to avoid
annotating all usage sites. Getting the information out is important.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134100.376598577@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-03-13 13:49:51 +01:00
parent 126f21f0e8
commit 5916d5f9b3
3 changed files with 13 additions and 3 deletions
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4
kernel/panic.c
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@@ -680,10 +680,12 @@ device_initcall(register_warn_debugfs);
* Called when gcc's -fstack-protector feature is used, and
* gcc detects corruption of the on-stack canary value
*/
__visible void __stack_chk_fail(void)
__visible noinstr void __stack_chk_fail(void)
{
instrumentation_begin();
panic("stack-protector: Kernel stack is corrupted in: %pB",
__builtin_return_address(0));
instrumentation_end();
}
EXPORT_SYMBOL(__stack_chk_fail);