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Created December 21, 2023 10:52
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report
TITLE: KMSAN: uninit-value in io_rw_fail
CORRUPTED: false ()
MAINTAINERS (TO): [axboe@kernel.dk io-uring@vger.kernel.org]
MAINTAINERS (CC): [asml.silence@gmail.com linux-kernel@vger.kernel.org]
=====================================================
BUG: KMSAN: uninit-value in io_fixup_rw_res io_uring/rw.c:311 [inline]
BUG: KMSAN: uninit-value in io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099
io_fixup_rw_res io_uring/rw.c:311 [inline]
io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099
io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1065
io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2100
io_submit_sqe io_uring/io_uring.c:2328 [inline]
io_submit_sqes+0x2527/0x30d0 io_uring/io_uring.c:2448
__do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline]
__se_sys_io_uring_enter+0x40c/0x4440 io_uring/io_uring.c:3647
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Uninit was created at:
slab_post_alloc_hook+0x1c6/0xbd0 mm/slab.h:768
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0x115/0x3e0 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
io_alloc_async_data io_uring/io_uring.c:1780 [inline]
io_req_prep_async+0x384/0x5a0 io_uring/io_uring.c:1801
io_queue_sqe_fallback+0x95/0x260 io_uring/io_uring.c:2097
io_submit_sqe io_uring/io_uring.c:2328 [inline]
io_submit_sqes+0x2527/0x30d0 io_uring/io_uring.c:2448
__do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline]
__se_sys_io_uring_enter+0x40c/0x4440 io_uring/io_uring.c:3647
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
CPU: 2 PID: 8051 Comm: 5e5 Not tainted 6.7.0-rc5-00189-gbd7f77dae695 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
=====================================================
TITLE: kernel panic: kmsan.panic set ...
CORRUPTED: false ()
MAINTAINERS (TO): [axboe@kernel.dk io-uring@vger.kernel.org]
MAINTAINERS (CC): [asml.silence@gmail.com linux-kernel@vger.kernel.org]
io_fixup_rw_res io_uring/rw.c:311 [inline]
io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099
io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1065
io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2100
io_submit_sqe io_uring/io_uring.c:2328 [inline]
io_submit_sqes+0x2527/0x30d0 io_uring/io_uring.c:2448
__do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline]
__se_sys_io_uring_enter+0x40c/0x4440 io_uring/io_uring.c:3647
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Uninit was created at:
slab_post_alloc_hook+0x1c6/0xbd0 mm/slab.h:768
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0x115/0x3e0 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
io_alloc_async_data io_uring/io_uring.c:1780 [inline]
io_req_prep_async+0x384/0x5a0 io_uring/io_uring.c:1801
io_queue_sqe_fallback+0x95/0x260 io_uring/io_uring.c:2097
io_submit_sqe io_uring/io_uring.c:2328 [inline]
io_submit_sqes+0x2527/0x30d0 io_uring/io_uring.c:2448
__do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline]
__se_sys_io_uring_enter+0x40c/0x4440 io_uring/io_uring.c:3647
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
CPU: 2 PID: 8051 Comm: 5e5 Not tainted 6.7.0-rc5-00189-gbd7f77dae695 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
=====================================================
Disabling lock debugging due to kernel taint
Kernel panic - not syncing: kmsan.panic set ...
CPU: 2 PID: 8051 Comm: 5e5 Tainted: G B 6.7.0-rc5-00189-gbd7f77dae695 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__msan_warning+0x96/0x110 mm/kmsan/instrumentation.c:317
io_fixup_rw_res io_uring/rw.c:311 [inline]
io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099
io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1065
io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2100
io_submit_sqe io_uring/io_uring.c:2328 [inline]
io_submit_sqes+0x2527/0x30d0 io_uring/io_uring.c:2448
__do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline]
__se_sys_io_uring_enter+0x40c/0x4440 io_uring/io_uring.c:3647
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x432e39
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:00007ffeeaf6ac18 EFLAGS: 00000216 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007ffeeaf6ae58 RCX: 0000000000432e39
RDX: 0000000000000000 RSI: 0000000000002d3e RDI: 0000000000000003
RBP: 00007ffeeaf6ac40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000001
R13: 00007ffeeaf6ae48 R14: 0000000000000001 R15: 0000000000000001
Raw
repro.c
// autogenerated by syzkaller (https://github.com/google/syzkaller)
#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/mman.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_io_uring_enter
#define __NR_io_uring_enter 426
#endif
#ifndef __NR_io_uring_setup
#define __NR_io_uring_setup 425
#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;
}
#define SIZEOF_IO_URING_SQE 64
#define SIZEOF_IO_URING_CQE 16
#define SQ_HEAD_OFFSET 0
#define SQ_TAIL_OFFSET 64
#define SQ_RING_MASK_OFFSET 256
#define SQ_RING_ENTRIES_OFFSET 264
#define SQ_FLAGS_OFFSET 276
#define SQ_DROPPED_OFFSET 272
#define CQ_HEAD_OFFSET 128
#define CQ_TAIL_OFFSET 192
#define CQ_RING_MASK_OFFSET 260
#define CQ_RING_ENTRIES_OFFSET 268
#define CQ_RING_OVERFLOW_OFFSET 284
#define CQ_FLAGS_OFFSET 280
#define CQ_CQES_OFFSET 320
struct io_sqring_offsets {
uint32_t head;
uint32_t tail;
uint32_t ring_mask;
uint32_t ring_entries;
uint32_t flags;
uint32_t dropped;
uint32_t array;
uint32_t resv1;
uint64_t resv2;
};
struct io_cqring_offsets {
uint32_t head;
uint32_t tail;
uint32_t ring_mask;
uint32_t ring_entries;
uint32_t overflow;
uint32_t cqes;
uint64_t resv[2];
};
struct io_uring_params {
uint32_t sq_entries;
uint32_t cq_entries;
uint32_t flags;
uint32_t sq_thread_cpu;
uint32_t sq_thread_idle;
uint32_t features;
uint32_t resv[4];
struct io_sqring_offsets sq_off;
struct io_cqring_offsets cq_off;
};
#define IORING_OFF_SQ_RING 0
#define IORING_OFF_SQES 0x10000000ULL
static long syz_io_uring_setup(volatile long a0, volatile long a1,
volatile long a2, volatile long a3) {
uint32_t entries = (uint32_t)a0;
struct io_uring_params* setup_params = (struct io_uring_params*)a1;
void** ring_ptr_out = (void**)a2;
void** sqes_ptr_out = (void**)a3;
uint32_t fd_io_uring = syscall(__NR_io_uring_setup, entries, setup_params);
uint32_t sq_ring_sz =
setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
uint32_t cq_ring_sz = setup_params->cq_off.cqes +
setup_params->cq_entries * SIZEOF_IO_URING_CQE;
uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
*ring_ptr_out =
mmap(0, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE,
fd_io_uring, IORING_OFF_SQ_RING);
uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
*sqes_ptr_out = mmap(0, sqes_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd_io_uring, IORING_OFF_SQES);
uint32_t* array =
(uint32_t*)((uintptr_t)*ring_ptr_out + setup_params->sq_off.array);
for (uint32_t index = 0; index < entries; index++) array[index] = index;
return fd_io_uring;
}
static long syz_io_uring_submit(volatile long a0, volatile long a1,
volatile long a2) {
char* ring_ptr = (char*)a0;
char* sqes_ptr = (char*)a1;
char* sqe = (char*)a2;
uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + SQ_RING_MASK_OFFSET);
uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + SQ_TAIL_OFFSET);
uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
char* sqe_dest = sqes_ptr + sq_tail * SIZEOF_IO_URING_SQE;
memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
uint32_t sq_tail_next = *sq_tail_ptr + 1;
__atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
return 0;
}
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, 0x0, 0x0};
void execute_one(void) {
intptr_t res = 0;
*(uint32_t*)0x200001c4 = 0;
*(uint32_t*)0x200001c8 = 0x10100;
*(uint32_t*)0x200001cc = 0;
*(uint32_t*)0x200001d0 = 0;
*(uint32_t*)0x200001d8 = -1;
memset((void*)0x200001dc, 0, 12);
res = -1;
res = syz_io_uring_setup(/*entries=*/0x24f7, /*params=*/0x200001c0,
/*ring_ptr=*/0x20000040, /*sqes_ptr=*/0x20000100);
if (res != -1) {
r[0] = res;
r[1] = *(uint64_t*)0x20000040;
r[2] = *(uint64_t*)0x20000100;
}
*(uint8_t*)0x20000740 = 2;
*(uint8_t*)0x20000741 = 0x10;
*(uint16_t*)0x20000742 = 0;
*(uint32_t*)0x20000744 = 0;
*(uint64_t*)0x20000748 = 0;
*(uint64_t*)0x20000750 = 0;
*(uint32_t*)0x20000758 = 0xfffffe08;
*(uint32_t*)0x2000075c = 0;
*(uint64_t*)0x20000760 = 0;
*(uint16_t*)0x20000768 = 0;
*(uint16_t*)0x2000076a = 0;
memset((void*)0x2000076c, 0, 20);
syz_io_uring_submit(/*ring_ptr=*/r[1], /*sqes_ptr=*/r[2], /*sqe=*/0x20000740);
syscall(__NR_io_uring_enter, /*fd=*/r[0], /*to_submit=*/0x2d3e,
/*min_complete=*/0, /*flags=*/0ul, /*sigmask=*/0ul, /*size=*/0ul);
}
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;
}
Raw
repro.txt
r0 = syz_io_uring_setup(0x24f7, &(0x7f00000001c0)={0x0, 0x0, 0x10100}, &(0x7f0000000040)=<r1=>0x0, &(0x7f0000000100)=<r2=>0x0)
syz_io_uring_submit(r1, r2, &(0x7f0000000740)=@IORING_OP_WRITEV={0x2, 0x10, 0x0, @fd_index, 0x0, 0x0, 0xfffffffffffffe08})
io_uring_enter(r0, 0x2d3e, 0x0, 0x0, 0x0, 0x0)
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