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io: Add tst-lstat-nofollow, tst-lstat-nofollow-time64

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They verify that lstat, lstat64 do not follow symbolic links.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer 2024-08-29 11:06:08 +02:00
parent a2509a8bc9
commit f4ae345810
3 changed files with 101 additions and 0 deletions
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2
io/Makefile
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@ -208,6 +208,7 @@ tests := \
tst-lchmod \
tst-linkat \
tst-lockf \
tst-lstat-nofollow \
tst-lutimes \
tst-mkdirat \
tst-mkfifoat \
@ -237,6 +238,7 @@ tests-time64 := \
tst-futimes-time64\
tst-futimesat-time64 \
tst-lchmod-time64 \
tst-lstat-nofollow-time64 \
tst-lutimes-time64 \
tst-stat-time64 \
tst-utime-time64 \

1
io/tst-lstat-nofollow-time64.c Normal file
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@ -0,0 +1 @@
#include "tst-lstat-nofollow.c"

98
io/tst-lstat-nofollow.c Normal file
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@ -0,0 +1,98 @@
/* Test that lstat does not follow symbolic links.
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <string.h>
#include <support/check.h>
#include <support/fuse.h>
#include <support/support.h>
#include <sys/stat.h>
#include <unistd.h>
static void
fuse_thread (struct support_fuse *f, void *closure)
{
struct fuse_in_header *inh;
while ((inh = support_fuse_next (f)) != NULL)
{
if (support_fuse_handle_mountpoint (f)
|| (inh->nodeid == 1 && support_fuse_handle_directory (f)))
continue;
switch (inh->opcode)
{
case FUSE_LOOKUP:
{
TEST_COMPARE (inh->nodeid, 1);
TEST_COMPARE_STRING (support_fuse_cast (LOOKUP, inh), "symlink");
struct fuse_entry_out *out = support_fuse_prepare_entry (f, 2);
out->attr.mode = S_IFLNK | 0777;
out->attr.size = strlen ("target");
support_fuse_reply_prepared (f);
}
break;
case FUSE_GETATTR:
{
TEST_COMPARE (inh->nodeid, 2);
struct fuse_attr_out *out = support_fuse_prepare_attr (f);
out->attr.mode = S_IFLNK | 0777;
out->attr.size = strlen ("target");
support_fuse_reply_prepared (f);
}
break;
case FUSE_READLINK:
/* The lstat operation must not attempt to look at the
symbolic link target. */
FAIL ("attempt to obtain target of symblic link for node %llu",
(unsigned long long int) inh->nodeid);
break;
default:
FAIL ("unexpected event %s", support_fuse_opcode (inh->opcode));
}
}
}
static int
do_test (void)
{
support_fuse_init ();
struct support_fuse *f = support_fuse_mount (fuse_thread, NULL);
char *symlink_path = xasprintf ("%s/symlink", support_fuse_mountpoint (f));
{
struct stat st = { 0, };
TEST_COMPARE (lstat (symlink_path, &st), 0);
TEST_COMPARE (st.st_uid, getuid ());
TEST_COMPARE (st.st_gid, getgid ());
TEST_COMPARE (st.st_size, 6);
TEST_COMPARE (st.st_mode, S_IFLNK | 0777);
}
{
struct stat64 st = { 0, };
TEST_COMPARE (lstat64 (symlink_path, &st), 0);
TEST_COMPARE (st.st_uid, getuid ());
TEST_COMPARE (st.st_gid, getgid ());
TEST_COMPARE (st.st_size, 6);
TEST_COMPARE (st.st_mode, S_IFLNK | 0777);
}
free (symlink_path);
support_fuse_unmount (f);
return 0;
}
#include <support/test-driver.c>