diff options
| author | Dave Hansen <haveblue@us.ibm.com> | 2008-02-15 14:37:38 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-19 00:29:15 -0400 |
| commit | 18f335aff86913de3c76f88d32c8135c1da62ce6 (patch) | |
| tree | bf541547b9774137a161d200bace04ad152e80e3 /fs/nfsd/vfs.c | |
| parent | 9079b1eb1753f217c3de9f1b7dd7fd549cc3f0cf (diff) | |
| download | lwn-18f335aff86913de3c76f88d32c8135c1da62ce6.tar.gz lwn-18f335aff86913de3c76f88d32c8135c1da62ce6.zip | |
[PATCH] r/o bind mounts: elevate write count for xattr_permission() callers
This basically audits the callers of xattr_permission(), which calls
permission() and can perform writes to the filesystem.
[AV: add missing parts - removexattr() and nfsd posix acls, plug for a leak
spotted by Miklos]
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfsd/vfs.c')
| -rw-r--r-- | fs/nfsd/vfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 18a4cc9feeb3..626dfd38528f 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -2086,6 +2086,9 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) } else size = 0; + error = mnt_want_write(fhp->fh_export->ex_path.mnt); + if (error) + goto getout; if (size) error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); else { @@ -2097,6 +2100,7 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) error = 0; } } + mnt_drop_write(fhp->fh_export->ex_path.mnt); getout: kfree(value); |