See <http://lists.gnu.org/archive/html/bug-patch/2015-06/msg00009.html>

From 0507dfad5f060161f01840067e1bb1615257b636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Mon, 8 Jun 2015 17:27:56 +0200
Subject: [PATCH] Do not rely on PATH_MAX when reading a symlink target.

* src/util.c (move_file, copy_file): Use 'fromst->st_size + 1' and
'tost->st_size + 1' for the allocation, and 'fromst->st_size' and
'tost->st_size' instead of PATH_MAX.  Fixes compilation on GNU/Hurd.
---
 src/util.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/util.c b/src/util.c
index 82a7e37..c4c0f9d 100644
--- a/src/util.c
+++ b/src/util.c
@@ -460,12 +460,12 @@ move_file (char const *from, bool *from_needs_removal,
 
 	  /* FROM contains the contents of the symlink we have patched; need
 	     to convert that back into a symlink. */
-	  char *buffer = xmalloc (PATH_MAX);
+	  char *buffer = xmalloc (fromst->st_size + 1);
 	  int fd, size = 0, i;
 
 	  if ((fd = safe_open (from, O_RDONLY | O_BINARY, 0)) < 0)
 	    pfatal ("Can't reopen file %s", quotearg (from));
-	  while ((i = read (fd, buffer + size, PATH_MAX - size)) > 0)
+	  while ((i = read (fd, buffer + size, fromst->st_size - size)) > 0)
 	    size += i;
 	  if (i != 0 || close (fd) != 0)
 	    read_fatal ();
@@ -610,9 +610,9 @@ copy_file (char const *from, char const *to, struct stat *tost,
 
   if (S_ISLNK (mode))
     {
-      char *buffer = xmalloc (PATH_MAX);
+      char *buffer = xmalloc (tost->st_size + 1);
 
-      if (safe_readlink (from, buffer, PATH_MAX) < 0)
+      if (safe_readlink (from, buffer, tost->st_size) < 0)
 	pfatal ("Can't read %s %s", "symbolic link", from);
       if (safe_symlink (buffer, to) != 0)
 	pfatal ("Can't create %s %s", "symbolic link", to);
-- 
2.4.2

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<tr><td><span title='2021-01-02 18:54:19 +0100'>2021-01-02</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=7431bdb5d5683af19c43058145605682394beb2b'>gnu: brltty: Update to 6.2.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-09-24 17:17:08 +0300'>2020-09-24</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=9995f7ebbca4acf9da052c008a3194f9d7e9bee6'>gnu: xmagnify: Use cc-for-target.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-09-24 17:15:43 +0300'>2020-09-24</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=6c1f173650728eb9d5f21254686e9b923808a89b'>gnu: footswitch: Use cc-for-target.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-08-18 23:26:16 +0200'>2020-08-18</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=de3f0ac66d9cf10ff5174f96989c8d7329987aa3'>gnu: Add brltty.</a><span class='msg-avail'>...</span></td><td>Raghav Gururajan</td></tr>
<tr><td><span title='2020-08-18 23:26:15 +0200'>2020-08-18</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=edaa508100fee7e629a69f8fb116707513a87a9d'>gnu: Add libbraille.</a><span class='msg-avail'>...</span></td><td>Raghav Gururajan</td></tr>