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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>
This commit is contained in:
OGAWA Hirofumi 2008-04-28 02:16:26 -07:00 committed by Linus Torvalds
parent 1278fdd34b
commit e97e8de388
1 changed files with 6 additions and 9 deletions
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15
fs/fat/file.c
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@ -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;