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Subject[PATCH, v5] vfs: introduce helper function to safely NUL-terminate symlinks
Date
A number of filesystems were potentially triggering kernel bugs due to
corrupted symlink names on disk. This function helps safely terminate
the names.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
---
Unchanged from v4.

include/linux/namei.h | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 99eb803..fc2e035 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -94,4 +94,9 @@ static inline char *nd_get_link(struct nameidata *nd)
return nd->saved_names[nd->depth];
}

+static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
+{
+ ((char *) name)[min(len, maxlen)] = '\0';
+}
+
#endif /* _LINUX_NAMEI_H */
--
1.6.0.4


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