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author | Jeff Liu <jeff.liu@oracle.com> | 2013-02-28 01:02:48 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-28 03:10:09 (GMT) |
commit | 32918dd9f19e5960af4cdfa41190bb843fb2247b (patch) | |
tree | 5f9e131e83017f3854a3435ec618773a328415a4 /firmware | |
parent | 9dc30918b23f4b0d7f7f81be5bda023aea3f6627 (diff) | |
download | linux-fsl-qoriq-32918dd9f19e5960af4cdfa41190bb843fb2247b.tar.xz |
ocfs2: fix ocfs2_init_security_and_acl() to initialize acl correctly
We need to re-initialize the security for a new reflinked inode with its
parent dirs if it isn't specified to be preserved for ocfs2_reflink().
However, the code logic is broken at ocfs2_init_security_and_acl()
although ocfs2_init_security_get() succeed. As a result,
ocfs2_acl_init() does not involked and therefore the default ACL of
parent dir was missing on the new inode.
Note this was introduced by 9d8f13ba3 ("security: new
security_inode_init_security API adds function callback")
To reproduce:
set default ACL for the parent dir(ocfs2 in this case):
$ setfacl -m default:user:jeff:rwx ../ocfs2/
$ getfacl ../ocfs2/
# file: ../ocfs2/
# owner: jeff
# group: jeff
user::rwx
group::r-x
other::r-x
default:user::rwx
default:user:jeff:rwx
default:group::r-x
default:mask::rwx
default:other::r-x
$ touch a
$ getfacl a
# file: a
# owner: jeff
# group: jeff
user::rw-
group::rw-
other::r--
Before patching, create reflink file b from a, the user
default ACL entry(user:jeff:rwx)was missing:
$ ./ocfs2_reflink a b
$ getfacl b
# file: b
# owner: jeff
# group: jeff
user::rw-
group::rw-
other::r--
In this case, the end user can also observed an error message at syslog:
(ocfs2_reflink,3229,2):ocfs2_init_security_and_acl:7193 ERROR: status = 0
After applying this patch, create reflink file c from a:
$ ./ocfs2_reflink a c
$ getfacl c
# file: c
# owner: jeff
# group: jeff
user::rw-
user:jeff:rwx #effective:rw-
group::r-x #effective:r--
mask::rw-
other::r--
Test program:
/* Usage: reflink <source> <dest> */
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
static int
reflink_file(char const *src_name, char const *dst_name,
bool preserve_attrs)
{
int fd;
#ifndef REFLINK_ATTR_NONE
# define REFLINK_ATTR_NONE 0
#endif
#ifndef REFLINK_ATTR_PRESERVE
# define REFLINK_ATTR_PRESERVE 1
#endif
#ifndef OCFS2_IOC_REFLINK
struct reflink_arguments {
uint64_t old_path;
uint64_t new_path;
uint64_t preserve;
};
# define OCFS2_IOC_REFLINK _IOW ('o', 4, struct reflink_arguments)
#endif
struct reflink_arguments args = {
.old_path = (unsigned long) src_name,
.new_path = (unsigned long) dst_name,
.preserve = preserve_attrs ? REFLINK_ATTR_PRESERVE :
REFLINK_ATTR_NONE,
};
fd = open(src_name, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Failed to open %s: %s\n",
src_name, strerror(errno));
return -1;
}
if (ioctl(fd, OCFS2_IOC_REFLINK, &args) < 0) {
fprintf(stderr, "Failed to reflink %s to %s: %s\n",
src_name, dst_name, strerror(errno));
return -1;
}
}
int
main(int argc, char *argv[])
{
if (argc != 3) {
fprintf(stdout, "Usage: %s source dest\n", argv[0]);
return 1;
}
return reflink_file(argv[1], argv[2], 0);
}
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Tao Ma <boyu.mt@taobao.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions