Subject: bug#63212: closed (Re: [PATCH] fix NFSv4 acl detection on F39)

From: [email-masked] (GNU bug Tracking System)
Date: Sun, 16 Feb 2025 06:08:03 +0000

Your bug report

#63212: [PATCH] fix NFSv4 acl detection on F39

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
63212: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63212
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: [PATCH] fix NFSv4 acl detection on F39
From: Paul Eggert <[email-masked]>
To: [email-masked]
Date: Sat, 15 Feb 2025 22:07:19 -0800
List-Id: <debbugs-submit.debbugs.gnu.org>

Closing the old bug report <https://bugs.gnu.org/63212> as the bug was 
fixed in Gnulib later that month. See the thread containing 
<https://lists.gnu.org/r/bug-gnulib/2023-05/msg00092.html>.

Subject: [PATCH] fix NFSv4 acl detection on F39
From: Ondrej Valousek <[email-masked]>
To: [email-masked]
Cc: Ondrej Valousek <[email-masked]>
Date: Mon, 1 May 2023 21:38:08 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

Sending the other proposed patch fixing the NFSv4 acl detection on Fedora39.
It's bit longer, but I think should be better.
Please review.

---
 lib/file-has-acl.c | 60 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 49 insertions(+), 11 deletions(-)

diff --git a/lib/file-has-acl.c b/lib/file-has-acl.c
index b31a2ea252..27da1c0607 100644
--- a/lib/file-has-acl.c
+++ b/lib/file-has-acl.c
@@ -121,6 +121,30 @@ acl_nfs4_nontrivial (uint32_t *xattr, ssize_t nbytes)
 
   return 0;
 }
+
+/* Return 1 if ATTR is found in the xattr list given by BUF */
+int have_xattr (char const *attr, char *buf, ssize_t buflen)
+{
+  char const *key = buf;
+  /* Loop over the list of zero terminated strings with the
+     attribute keys. Use the remaining buffer length to determine
+     the end of the list. */
+  while (buflen > 0) {
+    int keylen;
+
+    if (strcmp (key, attr) == 0)
+      {
+        /* we don't expect this function will be called again
+           so we free the buffer so caller does not have to */
+        free (buf);
+        return 1;
+      }
+    keylen = strlen (key) + 1;
+    buflen -= keylen;
+    key += keylen;
+  }
+  return 0;
+}
 #endif
 
 /* Return 1 if NAME has a nontrivial access control list,
@@ -139,25 +163,37 @@ file_has_acl (char const *name, struct stat const *sb)
 
 # if GETXATTR_WITH_POSIX_ACLS
 
-      ssize_t ret;
+      ssize_t ret, buflen;
+      char *attrlist;
       int initial_errno = errno;
 
-      ret = getxattr (name, XATTR_NAME_POSIX_ACL_ACCESS, NULL, 0);
-      if (ret < 0 && errno == ENODATA)
-        ret = 0;
-      else if (ret > 0)
+      ret = listxattr (name, NULL, 0);
+      if (ret <= 0)
+        return ret;
+      attrlist = malloc (ret);
+      if (attrlist == NULL)
+        return -1;
+      buflen = listxattr (name, attrlist, ret);
+      if (buflen == -1)
+        {
+          free (attrlist);
+          return - acl_errno_valid (errno);
+        }
+
+      if(have_xattr (XATTR_NAME_POSIX_ACL_ACCESS, attrlist, buflen))
         return 1;
+      else
+        ret = 0;
 
-      if (ret == 0 && S_ISDIR (sb->st_mode))
+      if (S_ISDIR (sb->st_mode))
         {
-          ret = getxattr (name, XATTR_NAME_POSIX_ACL_DEFAULT, NULL, 0);
-          if (ret < 0 && errno == ENODATA)
-            ret = 0;
-          else if (ret > 0)
+          if (have_xattr (XATTR_NAME_POSIX_ACL_DEFAULT, attrlist, buflen))
             return 1;
+          else
+            ret = 0;
         }
 
-      if (ret < 0)
+      if (have_xattr (XATTR_NAME_NFSV4_ACL, attrlist, buflen))
         {
           /* Check for NFSv4 ACLs.  The max length of a trivial
              ACL is 6 words for owner, 6 for group, 7 for everyone,
@@ -186,6 +222,8 @@ file_has_acl (char const *name, struct stat const *sb)
               errno = initial_errno;
             }
         }
+      else
+        free (attrlist);
       if (ret < 0)
         return - acl_errno_valid (errno);
       return ret;
-- 
2.40.1