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lookup_one_len: don't accept . and ..
author
Al Viro
<viro@zeniv.linux.org.uk>
Fri, 30 Nov 2012 03:17:21 +0000
(22:17 -0500)
committer
Al Viro
<viro@zeniv.linux.org.uk>
Fri, 30 Nov 2012 03:17:21 +0000
(22:17 -0500)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/namei.c
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diff --git
a/fs/namei.c
b/fs/namei.c
index
937f9d5
..
5f4cdf3
100644
(file)
--- a/
fs/namei.c
+++ b/
fs/namei.c
@@
-2131,6
+2131,11
@@
struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
if (!len)
return ERR_PTR(-EACCES);
+ if (unlikely(name[0] == '.')) {
+ if (len < 2 || (len == 2 && name[1] == '.'))
+ return ERR_PTR(-EACCES);
+ }
+
while (len--) {
c = *(const unsigned char *)name++;
if (c == '/' || c == '\0')