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| author | Alexander Popov <alex.popov@linux.com> | 2018-08-17 00:17:01 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2018-09-04 19:35:48 +0200 |
| commit | c8d126275a5fa59394fe17109bdb9812fed296b8 (patch) | |
| tree | 81be08434798afffb46681c2625c0d16e4e188cc /kernel | |
| parent | lkdtm: Add a test for STACKLEAK (diff) | |
| download | linux-c8d126275a5fa59394fe17109bdb9812fed296b8.tar.xz linux-c8d126275a5fa59394fe17109bdb9812fed296b8.zip | |
fs/proc: Show STACKLEAK metrics in the /proc file system
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/stackleak.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/stackleak.c b/kernel/stackleak.c index 628485db37ba..f66239572c89 100644 --- a/kernel/stackleak.c +++ b/kernel/stackleak.c @@ -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 |