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regression: cifs endianness bug 

access_flags_to_mode() gets on-the-wire data (little-endian) and treats
it as host-endian.

Introduced in commit e01b640013 ("[CIFS]
enable get mode from ACL when cifsacl mount option specified")

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2007-12-05 08:24:38 +00:00 коммит произвёл Linus Torvalds
Родитель ecaf18c15a
Коммит 9b5e6857b3
1 изменённых файлов: 17 добавлений и 16 удалений
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33
fs/cifs/cifsacl.c
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@ -134,9 +134,10 @@ int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
pmode is the existing mode (we only want to overwrite part of this
bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007
*/
static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode,
umode_t *pbits_to_set)
{
__u32 flags = le32_to_cpu(ace_flags);
/* the order of ACEs is important. The canonical order is to begin with
DENY entries followed by ALLOW, otherwise an allow entry could be
encountered first, making the subsequent deny entry like "dead code"
@ -146,17 +147,17 @@ static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
/* For deny ACEs we change the mask so that subsequent allow access
control entries do not turn on the bits we are denying */
if (type == ACCESS_DENIED) {
if (ace_flags & GENERIC_ALL) {
if (flags & GENERIC_ALL) {
*pbits_to_set &= ~S_IRWXUGO;
}
if ((ace_flags & GENERIC_WRITE) ||
((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
if ((flags & GENERIC_WRITE) ||
((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
*pbits_to_set &= ~S_IWUGO;
if ((ace_flags & GENERIC_READ) ||
((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
if ((flags & GENERIC_READ) ||
((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
*pbits_to_set &= ~S_IRUGO;
if ((ace_flags & GENERIC_EXECUTE) ||
((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
if ((flags & GENERIC_EXECUTE) ||
((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
*pbits_to_set &= ~S_IXUGO;
return;
} else if (type != ACCESS_ALLOWED) {
@ -165,25 +166,25 @@ static void access_flags_to_mode(__u32 ace_flags, int type, umode_t *pmode,
}
/* else ACCESS_ALLOWED type */
if (ace_flags & GENERIC_ALL) {
if (flags & GENERIC_ALL) {
*pmode |= (S_IRWXUGO & (*pbits_to_set));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("all perms"));
#endif
return;
}
if ((ace_flags & GENERIC_WRITE) ||
((ace_flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
if ((flags & GENERIC_WRITE) ||
((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS))
*pmode |= (S_IWUGO & (*pbits_to_set));
if ((ace_flags & GENERIC_READ) ||
((ace_flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
if ((flags & GENERIC_READ) ||
((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS))
*pmode |= (S_IRUGO & (*pbits_to_set));
if ((ace_flags & GENERIC_EXECUTE) ||
((ace_flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
if ((flags & GENERIC_EXECUTE) ||
((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS))
*pmode |= (S_IXUGO & (*pbits_to_set));
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("access flags 0x%x mode now 0x%x", ace_flags, *pmode));
cFYI(1, ("access flags 0x%x mode now 0x%x", flags, *pmode));
#endif
return;
}