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

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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>
This commit is contained in:
Siddhesh Poyarekar 2022-03-31 22:00:58 +05:30
parent 7f2ddf7400
commit b416555431
2 changed files with 8 additions and 5 deletions
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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",