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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-04-28 02:16:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:47 -0700
commite97e8de388723f9491514fa0434ddf1fd713a188 (patch)
tree582513162e3e9406a02d6de8a09af76da3839400
parent1278fdd34b12214b5c2e91e64848a5e54e57ed96 (diff)
fat: fat_setattr() fix
Fix fat_setattr() on the case of showexec option. If user specified showexec option, inode->i_mode may not have S_IXUGO. This just use inode->i_mode to fix it. And with this patch, we don't allow chmod() on memory inode, it's just bad behaviour. IOW, we allow changing S_IWUGO only which can be stored to disk. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/fat/file.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c
index b61a98f5398..e73f13a1379 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -257,7 +257,8 @@ int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
}
EXPORT_SYMBOL_GPL(fat_getattr);
-static int fat_check_mode(const struct msdos_sb_info *sbi, mode_t mode)
+static int fat_check_mode(const struct msdos_sb_info *sbi, struct inode *inode,
+ mode_t mode)
{
mode_t mask, req = mode & ~S_IFMT;
@@ -271,7 +272,7 @@ static int fat_check_mode(const struct msdos_sb_info *sbi, mode_t mode)
* w bits, either all (subject to umask) or none must be present.
*/
req &= ~mask;
- if ((req & (S_IRUGO | S_IXUGO)) != ((S_IRUGO | S_IXUGO) & ~mask))
+ if ((req & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
return -EPERM;
if ((req & S_IWUGO) && ((req & S_IWUGO) != (S_IWUGO & ~mask)))
return -EPERM;
@@ -310,7 +311,9 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
if (((attr->ia_valid & ATTR_UID) &&
(attr->ia_uid != sbi->options.fs_uid)) ||
((attr->ia_valid & ATTR_GID) &&
- (attr->ia_gid != sbi->options.fs_gid)))
+ (attr->ia_gid != sbi->options.fs_gid)) ||
+ ((attr->ia_valid & ATTR_MODE) &&
+ fat_check_mode(sbi, inode, attr->ia_mode) < 0))
error = -EPERM;
if (error) {
@@ -319,12 +322,6 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
goto out;
}
- if (attr->ia_valid & ATTR_MODE) {
- error = fat_check_mode(sbi, attr->ia_mode);
- if (error != 0 && !sbi->options.quiet)
- goto out;
- }
-
error = inode_setattr(inode, attr);
if (error)
goto out;