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vfs: introduce helper function to safely NUL-terminate symlinks

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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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Duane Griffin 2008-12-19 20:47:11 +00:00 committed by Al Viro
parent a17d5232de
commit 035146851c
1 changed files with 5 additions and 0 deletions
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5
include/linux/namei.h
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@ -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 */