qiurui
/
glibc
mirror of git://sourceware.org/git/glibc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

realpath: Bring back GNU extension on ENOENT and EACCES [BZ #28996] 

The GNU extension for realpath states that if the path resolution fails
with ENOENT or EACCES and the resolved buffer is non-NULL, it will
contain part of the path that failed resolution.

commit 949ad78a18 broke this when it
omitted the copy on failure.  Bring it back partially to continue
supporting this GNU extension.

Resolves: BZ #28996

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
(cherry picked from commit b416555431)
This commit is contained in:
Siddhesh Poyarekar 2022-03-31 22:00:58 +05:30 committed by Florian Weimer
parent 8a82a76a42
commit 5eae275400
3 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
NEWS
View File

@ -44,6 +44,7 @@ The following bugs are resolved with this release:
variants when avoiding overflow
[28937] New DSO dependency sorter does not put new map first if in a cycle
[28953] nss: Protect against errno changes in function lookup
[28996] realpath fails to copy partial result on ENOENT and EACCES
[29029] nptl: poll() spuriously returns EINTR during thread
cancellation and with cancellation disabled
[29039] Corrupt DTV after reuse of a TLS module ID following dlclose with unused TLS

9
stdlib/canonicalize.c
View File

@ -400,11 +400,14 @@ realpath_stk (const char *name, char *resolved,
error:
*dest++ = '\0';
if (!failed && resolved != NULL)
if (resolved != NULL)
{
if (dest - rname <= get_path_max ())
/* Copy the full result on success or partial result if failure was due
to the path not existing or not being accessible. */
if ((!failed || errno == ENOENT || errno == EACCES)
&& dest - rname <= get_path_max ())
rname = strcpy (resolved, rname);
else
else if (!failed)
{
failed = true;
__set_errno (ENAMETOOLONG);

4
stdlib/test-canon.c
View File

@ -174,8 +174,8 @@ do_test (int argc, char ** argv)
continue;
}
/* Only on success verify that buf contains the result too. */
if (result != NULL
/* Verify buf contents if the call succeeded or failed with ENOENT. */
if ((result != NULL || errno == ENOENT)
&& !check_path (buf, tests[i].out ? tests[i].out : tests[i].resolved))
{
printf ("%s: flunked test %d (expected resolved `%s', got `%s')\n",