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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-11-06 12:53:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-06 15:41:21 -0800
commit9183482f5d4a2de00f66641b974e7f351d41b675 (patch)
treecc23af150f0aab03b29704eb461dac98b6c1f0cf /fs/fat/file.c
parent9c0aa1b87bf541affef519eb4879ce7c5a5941ae (diff)
fat: Fix ATTR_RO in the case of (~umask & S_WUGO) == 0
If inode->i_mode doesn't have S_WUGO, current code assumes it means ATTR_RO. However, if (~[ufd]mask & S_WUGO) == 0, inode->i_mode can't hold S_WUGO. Therefore the updated directory entry will always have ATTR_RO. This adds fat_mode_can_hold_ro() to check it. And if inode->i_mode can't hold, uses -i_attrs to hold ATTR_RO instead. With this, we don't set ATTR_RO unless users change it via ioctl() if (~[ufd]mask & S_WUGO) == 0. And on FAT_IOCTL_GET_ATTRIBUTES path, this adds ->i_mutex to it for not returning the partially updated attributes by FAT_IOCTL_SET_ATTRIBUTES to userland. 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>
Diffstat (limited to 'fs/fat/file.c')
-rw-r--r--fs/fat/file.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c
index f5a7e907a8fa..81b15c623803 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -27,7 +27,12 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
switch (cmd) {
case FAT_IOCTL_GET_ATTRIBUTES:
{
- u32 attr = fat_make_attrs(inode);
+ u32 attr;
+
+ mutex_lock(&inode->i_mutex);
+ attr = fat_make_attrs(inode);
+ mutex_unlock(&inode->i_mutex);
+
return put_user(attr, user_attr);
}
case FAT_IOCTL_SET_ATTRIBUTES: