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Commit 03514685 authored by Duane Griffin's avatar Duane Griffin Committed by Al Viro
Browse files

vfs: introduce helper function to safely NUL-terminate symlinks 



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: default avatarDuane Griffin <duaneg@dghda.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a17d5232

include/linux/namei.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */