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| author |   Miklos Szeredi <mszeredi@redhat.com> | 2016-10-31 14:42:14 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-10-31 14:42:14 +0100 |
| commit | fd3220d37b1f6f0cab6142d98b0e6c4082e63299 (patch) | |
| tree | 69f329819476f64840bfa280bb83f1504efd7afd /fs | |
| parent | Linux 4.9-rc3 (diff) | |
| download | linux-dev-fd3220d37b1f6f0cab6142d98b0e6c4082e63299.tar.xz linux-dev-fd3220d37b1f6f0cab6142d98b0e6c4082e63299.zip | |
ovl: update S_ISGID when setting posix ACLs
This change fixes xfstest generic/375, which failed to clear the
setgid bit in the following test case on overlayfs:
touch $testfile
chown 100:100 $testfile
chmod 2755 $testfile
_runas -u 100 -g 101 -- setfacl -m u::rwx,g::rwx,o::rwx $testfile
Reported-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Tested-by: Amir Goldstein <amir73il@gmail.com>
Fixes: d837a49bd57f ("ovl: fix POSIX ACL setting")
Cc: <stable@vger.kernel.org> # v4.8
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/overlayfs/super.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index bcf3965be819..edd46a0e951d 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1037,6 +1037,21 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler, posix_acl_release(acl); + /* + * Check if sgid bit needs to be cleared (actual setacl operation will + * be done with mounter's capabilities and so that won't do it for us). + */ + if (unlikely(inode->i_mode & S_ISGID) && + handler->flags == ACL_TYPE_ACCESS && + !in_group_p(inode->i_gid) && + !capable_wrt_inode_uidgid(inode, CAP_FSETID)) { + struct iattr iattr = { .ia_valid = ATTR_KILL_SGID }; + + err = ovl_setattr(dentry, &iattr); + if (err) + return err; + } + err = ovl_xattr_set(dentry, handler->name, value, size, flags); if (!err) ovl_copyattr(ovl_inode_real(inode, NULL), inode); |