On 9/15/23 14:14, Kees Cook wrote:
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 afs_permits.
[1]
https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: David Howells <dhowe...@redhat.com>
Cc: Marc Dionne <marc.dio...@auristor.com>
Cc: linux-...@lists.infradead.org
Signed-off-by: Kees Cook <keesc...@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavo...@kernel.org>
Thanks
--
Gustavo
---
fs/afs/internal.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 07433a5349ca..469a717467a4 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -705,7 +705,7 @@ struct afs_permits {
refcount_t usage;
unsigned short nr_permits; /* Number of records */
bool invalidated; /* Invalidated due to key
change */
- struct afs_permit permits[]; /* List of permits sorted by
key pointer */
+ struct afs_permit permits[] __counted_by(nr_permits); /* List
of permits sorted by key pointer */
};
/*
