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[3/6] tools/nolibc: properly align dirent buffer

Message ID 20250416-nolibc-ubsan-v1-3-c4704bb23da7@weissschuh.net
State New
Headers show
Series tools/nolibc: fix some undefined behaviour and enable UBSAN | expand

Commit Message

Thomas Weißschuh April 16, 2025, 6:40 p.m. UTC 
As byte buffer is overlaid with a 'struct dirent64'.
it has to satisfy the structs alignment requirements.

Fixes: 665fa8dea90d ("tools/nolibc: add support for directory access")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
 tools/include/nolibc/dirent.h | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/tools/include/nolibc/dirent.h b/tools/include/nolibc/dirent.h
index c5c30d0dd6806b1bec2fa8120a3df29aaa201393..cd0ddff86c360b14913a809c8696d89d8a356e9e 100644
--- a/tools/include/nolibc/dirent.h
+++ b/tools/include/nolibc/dirent.h
@@ -58,6 +58,7 @@  int closedir(DIR *dirp)
 static __attribute__((unused))
 int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
 {
+	__attribute__((aligned(__alignof__(struct linux_dirent64))))
 	char buf[sizeof(struct linux_dirent64) + NAME_MAX + 1];
 	struct linux_dirent64 *ldir = (void *)buf;
 	intptr_t i = (intptr_t)dirp;