The patch titled
Subject: gcov: annotate struct gcov_iterator with __counted_by
has been added to the -mm mm-nonmm-unstable branch. Its filename is
gcov-annotate-struct-gcov_iterator-with-__counted_by.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/gcov-annotate-struct-gcov_iterator-with-__counted_by.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: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: gcov: annotate struct gcov_iterator with __counted_by
Date: Fri, 22 Sep 2023 10:52:20 -0700
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct gcov_iterator.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Link: https://lkml.kernel.org/r/20230922175220.work.327-kees@xxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Tom Rix <trix@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/gcov/fs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/gcov/fs.c~gcov-annotate-struct-gcov_iterator-with-__counted_by
+++ a/kernel/gcov/fs.c
@@ -99,7 +99,7 @@ struct gcov_iterator {
struct gcov_info *info;
size_t size;
loff_t pos;
- char buffer[];
+ char buffer[] __counted_by(size);
};
/**
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
mm-memcg-annotate-struct-mem_cgroup_threshold_ary-with-__counted_by.patch
ocfs2-annotate-struct-ocfs2_replay_map-with-__counted_by.patch
gcov-annotate-struct-gcov_iterator-with-__counted_by.patch
