lkml.org 
[lkml]   [2018]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.9 066/329] ocfs2/acl: use ip_xattr_sem to protect getting extended attribute
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: piaojun <piaojun@huawei.com>

[ Upstream commit 16c8d569f5704a84164f30ff01b29879f3438065 ]

The race between *set_acl and *get_acl will cause getting incomplete
xattr data as below:

processA processB

ocfs2_set_acl
ocfs2_xattr_set
__ocfs2_xattr_set_handle

ocfs2_get_acl_nolock
ocfs2_xattr_get_nolock:

processB may get incomplete xattr data if processA hasn't set_acl done.

So we should use 'ip_xattr_sem' to protect getting extended attribute in
ocfs2_get_acl_nolock(), as other processes could be changing it
concurrently.

Link: http://lkml.kernel.org/r/5A5DDCFF.7030001@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Alex Chen <alex.chen@huawei.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ocfs2/acl.c | 6 ++++++
fs/ocfs2/xattr.c | 2 ++
2 files changed, 8 insertions(+)

--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -314,7 +314,9 @@ struct posix_acl *ocfs2_iop_get_acl(stru
return ERR_PTR(ret);
}

+ down_read(&OCFS2_I(inode)->ip_xattr_sem);
acl = ocfs2_get_acl_nolock(inode, type, di_bh);
+ up_read(&OCFS2_I(inode)->ip_xattr_sem);

ocfs2_inode_unlock(inode, 0);
brelse(di_bh);
@@ -333,7 +335,9 @@ int ocfs2_acl_chmod(struct inode *inode,
if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
return 0;

+ down_read(&OCFS2_I(inode)->ip_xattr_sem);
acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
+ up_read(&OCFS2_I(inode)->ip_xattr_sem);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
@@ -364,8 +368,10 @@ int ocfs2_init_acl(handle_t *handle,

if (!S_ISLNK(inode->i_mode)) {
if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
+ down_read(&OCFS2_I(dir)->ip_xattr_sem);
acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
dir_bh);
+ up_read(&OCFS2_I(dir)->ip_xattr_sem);
if (IS_ERR(acl))
return PTR_ERR(acl);
}
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -638,9 +638,11 @@ int ocfs2_calc_xattr_init(struct inode *
si->value_len);

if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
+ down_read(&OCFS2_I(dir)->ip_xattr_sem);
acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
"", NULL, 0);
+ up_read(&OCFS2_I(dir)->ip_xattr_sem);
if (acl_len > 0) {
a_size = ocfs2_xattr_entry_real_size(0, acl_len);
if (S_ISDIR(mode))

\
 
 \ /
  Last update: 2018-05-28 16:49    [W:0.578 / U:26.432 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site