android13/external/ltp/testcases/kernel/syscalls/setsockopt/setsockopt07.c

146 lines
3.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2020 SUSE LLC <mdoucha@suse.cz>
*/
/*
* CVE-2017-1000111
*
* Check for race condition between packet_set_ring() and tp_reserve.
* The race allows you to set tp_reserve bigger than ring buffer size.
* While this will cause truncation of all incoming packets to 0 bytes,
* sanity checks in tpacket_rcv() prevent any exploitable buffer overflows.
* Race fixed in:
*
* commit c27927e372f0785f3303e8fad94b85945e2c97b7 (HEAD)
* Author: Willem de Bruijn <willemb@google.com>
* Date: Thu Aug 10 12:41:58 2017 -0400
*
* packet: fix tp_reserve race in packet_set_ring
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sched.h>
#include "tst_test.h"
#include "tst_fuzzy_sync.h"
#include "lapi/if_packet.h"
#include "lapi/if_ether.h"
static int sock = -1;
static struct tst_fzsync_pair fzsync_pair;
static void setup(void)
{
int real_uid = getuid();
int real_gid = getgid();
SAFE_UNSHARE(CLONE_NEWUSER);
SAFE_UNSHARE(CLONE_NEWNET);
SAFE_FILE_PRINTF("/proc/self/setgroups", "deny");
SAFE_FILE_PRINTF("/proc/self/uid_map", "0 %d 1", real_uid);
SAFE_FILE_PRINTF("/proc/self/gid_map", "0 %d 1", real_gid);
/*
* Reproducing the bug on unpatched system takes <15 loops. The test
* is slow and the bug is mostly harmless so don't waste too much
* time.
*/
fzsync_pair.exec_loops = 500;
tst_fzsync_pair_init(&fzsync_pair);
}
static void *thread_run(void *arg)
{
unsigned int val = 1 << 30;
while (tst_fzsync_run_b(&fzsync_pair)) {
tst_fzsync_start_race_b(&fzsync_pair);
setsockopt(sock, SOL_PACKET, PACKET_RESERVE, &val, sizeof(val));
tst_fzsync_end_race_b(&fzsync_pair);
}
return arg;
}
static void run(void)
{
unsigned int val, version = TPACKET_V3;
socklen_t vsize = sizeof(val);
struct tpacket_req3 req = {
.tp_block_size = 4096,
.tp_block_nr = 1,
.tp_frame_size = 4096,
.tp_frame_nr = 1,
.tp_retire_blk_tov = 100
};
tst_fzsync_pair_reset(&fzsync_pair, thread_run);
while (tst_fzsync_run_a(&fzsync_pair)) {
sock = SAFE_SOCKET(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
TEST(setsockopt(sock, SOL_PACKET, PACKET_VERSION, &version,
sizeof(version)));
if (TST_RET == -1 && TST_ERR == EINVAL)
tst_brk(TCONF | TTERRNO, "TPACKET_V3 not supported");
if (TST_RET) {
tst_brk(TBROK | TTERRNO,
"setsockopt(PACKET_VERSION, TPACKET_V3");
}
tst_fzsync_start_race_a(&fzsync_pair);
TEST(setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &req,
sizeof(req)));
tst_fzsync_end_race_a(&fzsync_pair);
SAFE_GETSOCKOPT(sock, SOL_PACKET, PACKET_RESERVE, &val, &vsize);
SAFE_CLOSE(sock);
if (TST_RET == -1 && TST_ERR == EINVAL) {
tst_fzsync_pair_add_bias(&fzsync_pair, 1);
continue;
}
if (TST_RET) {
tst_brk(TBROK | TTERRNO,
"Invalid setsockopt() return value");
}
if (val > req.tp_block_size){
tst_res(TFAIL, "PACKET_RESERVE checks bypassed");
return;
}
}
tst_res(TPASS, "Cannot reproduce bug");
}
static void cleanup(void)
{
tst_fzsync_pair_cleanup(&fzsync_pair);
if (sock >= 0)
SAFE_CLOSE(sock);
}
static struct tst_test test = {
.test_all = run,
.setup = setup,
.cleanup = cleanup,
.needs_kconfigs = (const char *[]) {
"CONFIG_USER_NS=y",
"CONFIG_NET_NS=y",
NULL
},
.tags = (const struct tst_tag[]) {
{"linux-git", "c27927e372f0"},
{"CVE", "2017-1000111"},
{}
}
};