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authorErnesto A. Fernández <ernesto.mnd.fernandez@gmail.com>2017-08-31 15:53:15 +0300
committerBob Peterson <rpeterso@redhat.com>2017-08-31 15:53:15 +0300
commit309e8cda596f6552a32dd14b969ce9b17f837f2f (patch)
tree844567e15a8075d15a041cf5c3f01f1c2d6773da
parent54aae14beee6a6e9f72358f1873b3e497029c41d (diff)
downloadlinux-309e8cda596f6552a32dd14b969ce9b17f837f2f.tar.xz
gfs2: preserve i_mode if __gfs2_set_acl() fails
When changing a file's acl mask, __gfs2_set_acl() will first set the group bits of i_mode to the value of the mask, and only then set the actual extended attribute representing the new acl. If the second part fails (due to lack of space, for example) and the file had no acl attribute to begin with, the system will from now on assume that the mask permission bits are actual group permission bits, potentially granting access to the wrong users. Prevent this by only changing the inode mode after the acl has been set. Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
-rw-r--r--fs/gfs2/acl.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index a6d962323790..9d5eecb123de 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -116,6 +116,7 @@ int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
struct gfs2_holder gh;
bool need_unlock = false;
int ret;
+ umode_t mode;
if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
return -E2BIG;
@@ -130,17 +131,19 @@ int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
return ret;
need_unlock = true;
}
- if (type == ACL_TYPE_ACCESS && acl) {
- umode_t mode = inode->i_mode;
- ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
+ mode = inode->i_mode;
+ if (type == ACL_TYPE_ACCESS && acl) {
+ ret = posix_acl_update_mode(inode, &mode, &acl);
if (ret)
goto unlock;
- if (mode != inode->i_mode)
- mark_inode_dirty(inode);
}
ret = __gfs2_set_acl(inode, acl, type);
+ if (!ret && mode != inode->i_mode) {
+ inode->i_mode = mode;
+ mark_inode_dirty(inode);
+ }
unlock:
if (need_unlock)
gfs2_glock_dq_uninit(&gh);