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>
Acked-by: Andreas Gruenbacher <agruen@suse.de>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 6347c2dbdd819ad405082e83cbaa2966be185d77..daaa243eee9b906e3eb22ef27da831a6b8c3e05d 100644 (file)
--- 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);

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index b34886734a44d0417221231ba454bd6aa5aba2a5..1c0a51bc460ba2c75e351260076da486f33d289d 100644 (file)
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1459,10 +1459,14 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
                set_opt(sbi->s_mount_opt, GRPID);
        if (def_mount_opts & EXT3_DEFM_UID16)
                set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT3_FS_XATTR
        if (def_mount_opts & EXT3_DEFM_XATTR_USER)
                set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
        if (def_mount_opts & EXT3_DEFM_ACL)
                set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
        if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
                sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
        else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 486a641ca71b94fa0ed745a246d57285d01611e1..fa1d1f3da9d243f9e4574d3ed0023a8efd0ada5d 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1518,10 +1518,14 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
                set_opt(sbi->s_mount_opt, GRPID);
        if (def_mount_opts & EXT4_DEFM_UID16)
                set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT4DEV_FS_XATTR
        if (def_mount_opts & EXT4_DEFM_XATTR_USER)
                set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
        if (def_mount_opts & EXT4_DEFM_ACL)
                set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
        if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
                sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
        else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)