[pve-devel] [PATCH cluster] fix #6445: correctly set size when stat-ing symlinks

From: "Fabian Grünbichler" <f.gruenbichler@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH cluster] fix #6445: correctly set size when stat-ing symlinks
Date: Fri,  6 Jun 2025 10:50:49 +0200	[thread overview]
Message-ID: <20250606085049.127928-1-f.gruenbichler@proxmox.com> (raw)

the size of a symlink should be the length of its target, some tools like
bsdtar seem to actually rely on this information for allocating buffers..

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---

Notes:
    should apply to master and stable-bookworm, and can IMHO go into both..

 src/pmxcfs/cfs-plug-link.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/pmxcfs/cfs-plug-link.c b/src/pmxcfs/cfs-plug-link.c
index d4eedfc..573db4d 100644
--- a/src/pmxcfs/cfs-plug-link.c
+++ b/src/pmxcfs/cfs-plug-link.c
@@ -55,8 +55,16 @@ static int cfs_plug_link_getattr(cfs_plug_t *plug, const char *path, struct stat
 
     cfs_debug("enter cfs_plug_link_getattr %s", path);
 
+    int ret = -EACCES;
+
+    cfs_plug_link_t *lnk = (cfs_plug_link_t *)plug;
+    if (!lnk->symlink) {
+        goto ret;
+    }
+
     memset(stbuf, 0, sizeof(struct stat));
 
+    stbuf->st_size = strlen(lnk->symlink);
     if (cfs_is_quorate()) {
         stbuf->st_mode = S_IFLNK | 0777;
     } else {
@@ -65,7 +73,10 @@ static int cfs_plug_link_getattr(cfs_plug_t *plug, const char *path, struct stat
 
     stbuf->st_nlink = 1;
 
-    return 0;
+    ret = 0;
+
+ret:
+    return ret;
 }
 
 static int cfs_plug_link_readlink(cfs_plug_t *plug, const char *path, char *buf, size_t max) {
-- 
2.39.5



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