* [PATCH] fs/xattr: Annotate struct simple_xattr with __counted_by
@ 2025-11-09 13:23 Thorsten Blum
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From: Thorsten Blum @ 2025-11-09 13:23 UTC (permalink / raw)
To: Kees Cook, Gustavo A. R. Silva
Cc: Thorsten Blum, linux-kernel, linux-hardening
Add the __counted_by() compiler attribute to the flexible array member
'value' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
include/linux/xattr.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 86b0d47984a1..2d0ccf99ee75 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -114,7 +114,7 @@ struct simple_xattr {
struct rb_node rb_node;
char *name;
size_t size;
- char value[];
+ char value[] __counted_by(size);
};
void simple_xattrs_init(struct simple_xattrs *xattrs);
--
2.51.1
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2025-11-09 13:23 [PATCH] fs/xattr: Annotate struct simple_xattr with __counted_by Thorsten Blum
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