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fs/proc: Show STACKLEAK metrics in the /proc file system

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Introduce CONFIG_STACKLEAK_METRICS providing STACKLEAK information about
tasks via the /proc file system. In particular, /proc/<pid>/stack_depth
shows the maximum kernel stack consumption for the current and previous
syscalls. Although this information is not precise, it can be useful for
estimating the STACKLEAK performance impact for your workloads.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Alexander Popov <alex.popov@linux.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Alexander Popov
2018-08-17 01:17:01 +03:00
committed by Kees Cook
parent f90d1e0c78
commit c8d126275a
5 changed files with 38 additions and 0 deletions
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4
kernel/stackleak.c
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@@ -41,6 +41,10 @@ asmlinkage void stackleak_erase(void)
if (kstack_ptr == boundary)
kstack_ptr += sizeof(unsigned long);
#ifdef CONFIG_STACKLEAK_METRICS
current->prev_lowest_stack = kstack_ptr;
#endif
/*
* Now write the poison value to the kernel stack. Start from
* 'kstack_ptr' and move up till the new 'boundary'. We assume that