BUG: unable to handle kernel paging request in crypto_sha3_update

From: xingwei lee
Date: Tue Mar 19 2024 - 22:58:17 EST

Hello I found a bug titled "BUG: unable to handle kernel paging
request in crypto_sha3_update", and maybe is related with net/crypto.
I also confirmed in the latest upstream and latest net tree.

If you fix this issue, please add the following tag to the commit:
Reported-by: xingwei lee <xrivendell7@xxxxxxxxx>
Reported-by: yue sun <samsun1006219@xxxxxxxxx>

kernel: net 32fa4366cc4da1c97b725a0066adf43c6b298f37
kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=9f47e8dfa53b0b11
with KASAN enabled
compiler: gcc (Debian 12.2.0-14) 12.2.0

BUG: unable to handle page fault for address: ffff88802c583080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 14a01067 P4D 14a01067 PUD 14a02067 PMD 26119063 PTE 800fffffd3a7c060
Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 8138 Comm: a0c Not tainted 6.8.0-05242-g32fa4366cc4d #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:get_unaligned_le64 include/asm-generic/unaligned.h:37 [inline]
RIP: 0010:crypto_sha3_update+0x233/0x4c0 crypto/sha3_generic.c:197
Code: c0 40 84 ff 40 0f 95 c7 41 84 f8 0f 85 eb 01 00 00 83 e1 07 40
38 ce 40 0f 9e c7 40 84 f6 0f 91
RSP: 0018:ffffc90012b7f8c8 EFLAGS: 00010246
RAX: ffff88802c583080 RBX: 0000000000000009 RCX: 0000000000000000
RDX: ffff888018b15bc0 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff88802fb10b00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802c583080 R15: ffff88802fb10b00
FS: 00000000334d4380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88802c583080 CR3: 000000014d8dc000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
shash_ahash_update+0x1ac/0x1f0 crypto/ahash.c:71
crypto_ahash_update+0x7b/0x110 crypto/ahash.c:350
hash_sendmsg+0x2a9/0xf30 crypto/algif_hash.c:149
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0xab5/0xc90 net/socket.c:2584
___sys_sendmsg+0x135/0x1e0 net/socket.c:2638
__sys_sendmsg+0x117/0x1f0 net/socket.c:2667
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x432cb9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c8
RSP: 002b:00007ffe88e07ef8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffe88e08128 RCX: 0000000000432cb9
RDX: 47933e2b0522cf63 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007ffe88e07f10 R08: 00007ffe88e07f10 R09: 00007ffe88e07f10
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000001
R13: 00007ffe88e08118 R14: 0000000000000001 R15: 0000000000000001
</TASK>

=* repro.c =*
#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#ifndef __NR_memfd_secret
#define __NR_memfd_secret 447
#endif

static void sleep_ms(uint64_t ms) {
usleep(ms * 1000);
}

static uint64_t current_time_ms(void) {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static bool write_file(const char* file, const char* what, ...) {
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}

static void kill_and_wait(int pid, int* status) {
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
for (int i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR* dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent* ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}

static void setup_test() {
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void) {
int iter = 0;
for (;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
sleep_ms(1);
if (current_time_ms() - start < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void) {
intptr_t res = 0;
res = syscall(__NR_socket, /*domain=*/0x26ul, /*type=*/5ul, /*proto=*/0);
if (res != -1)
r[0] = res;
*(uint16_t*)0x20000000 = 0x26;
memcpy((void*)0x20000002, "hash\000\000\000\000\000\000\000\000\000\000", 14);
*(uint32_t*)0x20000010 = 0;
*(uint32_t*)0x20000014 = 0;
memcpy((void*)0x20000018,
"sha3-"
"512\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
"\000\000\000\000\000\000",
64);
syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x20000000ul, /*addrlen=*/0x58ul);
res = syscall(__NR_accept, /*fd=*/r[0], /*peer=*/0ul, /*peerlen=*/0ul);
if (res != -1)
r[1] = res;
res = syscall(__NR_memfd_secret, /*flags=*/0ul);
if (res != -1)
r[2] = res;
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0xb36000ul,
/*prot=*/0x2000003ul, /*flags=*/0x28011ul, /*fd=*/r[2],
/*offset=*/0ul);
syscall(__NR_ftruncate, /*fd=*/r[2], /*len=*/0xde99ul);
*(uint64_t*)0x20000180 = 0;
*(uint32_t*)0x20000188 = 0;
*(uint64_t*)0x20000190 = 0x20000140;
*(uint64_t*)0x20000140 = 0x20000080;
*(uint64_t*)0x20000148 = 0xb0;
*(uint64_t*)0x20000198 = 1;
*(uint64_t*)0x200001a0 = 0;
*(uint64_t*)0x200001a8 = 0;
*(uint32_t*)0x200001b0 = 0;
syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x20000180ul,
/*f=*/0x47933e2b0522cf63ul);
}
int main(void) {
syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
loop();
return 0;
}


=* repro.txt =*
r0 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r0, &(0x7f0000000000)={0x26, 'hash\x00', 0x0, 0x0,
'sha3-512\x00'}, 0x58)
r1 = accept(r0, 0x0, 0x0)
r2 = memfd_secret(0x0)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x2000003, 0x28011, r2, 0x0)
ftruncate(r2, 0xde99)
sendmsg$DEVLINK_CMD_RELOAD(r1, &(0x7f0000000180)={0x0, 0x0,
&(0x7f0000000140)={&(0x7f0000000080)=ANY=[], 0xb0}},
0x47933e2b0522cf63)


see aslo https://gist.github.com/xrivendell7/411acf9336ff0b6a70b9742702bbfb1a.

I hope it helps.
best regards.
xingwei Lee