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authorDave Hansen <haveblue@us.ibm.com>2008-02-15 14:37:38 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 00:29:15 -0400
commit18f335aff86913de3c76f88d32c8135c1da62ce6 (patch)
treebf541547b9774137a161d200bace04ad152e80e3 /fs/nfsd/vfs.c
parent9079b1eb1753f217c3de9f1b7dd7fd549cc3f0cf (diff)
[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.c4
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);