The patch titled
Subject: fault-injection: skip stacktrace filtering by default
has been added to the -mm mm-nonmm-unstable branch. Its filename is
fault-injection-skip-stacktrace-filtering-by-default.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fault-injection-skip-stacktrace-filtering-by-default.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Subject: fault-injection: skip stacktrace filtering by default
Date: Wed, 17 Aug 2022 08:03:30 +0000
If FAULT_INJECTION_STACKTRACE_FILTER is enabled, the depth is default to
32. This means fail_stacktrace() will iter each entry's stacktrace, even
if filter is not configured.
This patch changes to quick return from fail_stacktrace() if stacktrace
filter is not set.
Link: https://lkml.kernel.org/r/20220817080332.1052710-3-weiyongjun1@xxxxxxxxxx
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Cc: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Isabella Basso <isabbasso@xxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Miguel Ojeda <ojeda@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/fault-inject.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/fault-inject.c~fault-injection-skip-stacktrace-filtering-by-default
+++ a/lib/fault-inject.c
@@ -74,7 +74,7 @@ static bool fail_stacktrace(struct fault
int n, nr_entries;
bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX);
- if (depth == 0)
+ if (depth == 0 || (found && !attr->reject_start && !attr->reject_end))
return found;
nr_entries = stack_trace_save(entries, depth, 1);
_
Patches currently in -mm which might be from weiyongjun1@xxxxxxxxxx are
fault-injection-allow-stacktrace-filter-for-x86-64.patch
fault-injection-skip-stacktrace-filtering-by-default.patch
fault-injection-make-some-stack-filter-attrs-more-readable.patch
fault-injection-make-stacktrace-filter-works-as-expected.patch
