[PATCH] ecryptfs: Annotate struct ecryptfs_message with __counted_by

Thorsten Blum
2026-01-12T16:35:04Z

Add the __counted_by() compiler attribute to the flexible array member
'data' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
fs/ecryptfs/ecryptfs_kernel.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 62a2ea7f59ed..f58b12be8267 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -359,7 +359,7 @@ struct ecryptfs_message {
/* Inherits from msg_ctx->index */
u32 index;
u32 data_len;
- u8 data[];
+ u8 data[] __counted_by(data_len);
};

struct ecryptfs_msg_ctx {
--
Thorsten Blum <thorsten.blum@linux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6 9D84 7336 78FD 8DFE EAD4