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
