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author | 2020-09-02 10:58:48 +0200 | |
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committer | 2020-09-02 10:58:48 +0200 | |
commit | 92f0d6c9cfcf1f1fa54251353a9c4cd63fa30544 (patch) | |
tree | 4e9f1b1e31923c3be723140efe311085a96c3344 /fs/overlayfs | |
parent | ovl: clean up ovl_getxattr() in copy_up.c (diff) | |
download | linux-92f0d6c9cfcf1f1fa54251353a9c4cd63fa30544.tar.gz linux-92f0d6c9cfcf1f1fa54251353a9c4cd63fa30544.tar.bz2 linux-92f0d6c9cfcf1f1fa54251353a9c4cd63fa30544.zip |
ovl: fold ovl_getxattr() into ovl_get_redirect_xattr()
This is a partial revert (with some cleanups) of commit 993a0b2aec52 ("ovl:
Do not lose security.capability xattr over metadata file copy-up"), which
introduced ovl_getxattr() in the first place.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r-- | fs/overlayfs/util.c | 53 |
1 files changed, 17 insertions, 36 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index feca16a47f57..4cc1366c96a6 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -882,49 +882,26 @@ bool ovl_is_metacopy_dentry(struct dentry *dentry) return (oe->numlower > 1); } -static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, - size_t padding) -{ - ssize_t res; - char *buf = NULL; - - res = vfs_getxattr(dentry, name, NULL, 0); - if (res < 0) { - if (res == -ENODATA || res == -EOPNOTSUPP) - return -ENODATA; - goto fail; - } - - if (res != 0) { - buf = kzalloc(res + padding, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - res = vfs_getxattr(dentry, name, buf, res); - if (res < 0) - goto fail; - } - *value = buf; - - return res; - -fail: - pr_warn_ratelimited("failed to get xattr %s: err=%zi)\n", - name, res); - kfree(buf); - return res; -} - char *ovl_get_redirect_xattr(struct dentry *dentry, int padding) { int res; char *s, *next, *buf = NULL; - res = ovl_getxattr(dentry, OVL_XATTR_REDIRECT, &buf, padding + 1); - if (res == -ENODATA) + res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, NULL, 0); + if (res == -ENODATA || res == -EOPNOTSUPP) return NULL; if (res < 0) - return ERR_PTR(res); + goto fail; + if (res == 0) + goto invalid; + + buf = kzalloc(res + padding + 1, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, buf, res); + if (res < 0) + goto fail; if (res == 0) goto invalid; @@ -943,6 +920,10 @@ char *ovl_get_redirect_xattr(struct dentry *dentry, int padding) invalid: pr_warn_ratelimited("invalid redirect (%s)\n", buf); res = -EINVAL; + goto err_free; +fail: + pr_warn_ratelimited("failed to get redirect (%i)\n", res); +err_free: kfree(buf); return ERR_PTR(res); } |