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authorHugh Dickins <hugh@veritas.com>2007-02-10 01:46:13 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:34 -0800
commit2e7842b887627c4319c4625d2b52fa6616fda2cd (patch)
tree608123e38adff4cb19f756b0a67158ea30a15b18 /fs/ext2/super.c
parent9bbf81e4830db873300c1d0503b371b4f8a932ce (diff)
[PATCH] fix umask when noACL kernel meets extN tuned for ACLs
Fix insecure default behaviour reported by Tigran Aivazian: if an ext2 or ext3 or ext4 filesystem is tuned to mount with "acl", but mounted by a kernel built without ACL support, then umask was ignored when creating inodes - though root or user has umask 022, touch creates files as 0666, and mkdir creates directories as 0777. This appears to have worked right until 2.6.11, when a fix to the default mode on symlinks (always 0777) assumed VFS applies umask: which it does, unless the mount is marked for ACLs; but ext[234] set MS_POSIXACL in s_flags according to s_mount_opt set according to def_mount_opts. We could revert to the 2.6.10 ext[234]_init_acl (adding an S_ISLNK test); but other filesystems only set MS_POSIXACL when ACLs are configured. We could fix this at another level; but it seems most robust to avoid setting the s_mount_opt flag in the first place (at the expense of more ifdefs). Likewise don't set the XATTR_USER flag when built without XATTR support. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk> Cc: <linux-ext4@vger.kernel.org> Cc: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext2/super.c')
-rw-r--r--fs/ext2/super.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 6347c2dbdd8..daaa243eee9 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -708,10 +708,14 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
set_opt(sbi->s_mount_opt, GRPID);
if (def_mount_opts & EXT2_DEFM_UID16)
set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT2_FS_XATTR
if (def_mount_opts & EXT2_DEFM_XATTR_USER)
set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
if (def_mount_opts & EXT2_DEFM_ACL)
set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
set_opt(sbi->s_mount_opt, ERRORS_PANIC);