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authorJens Axboe <axboe@kernel.dk>2021-02-28 15:37:54 -0700
committerJens Axboe <axboe@kernel.dk>2021-02-28 15:37:54 -0700
commit6aa9b364a96321843b34f7edd2cd178d79bdd642 (patch)
tree93cfbf23be449a232994534af61ae10e224614ae
parent965bae440af1d846d94765c12da2246e7fcaf9db (diff)
downloadliburing-6aa9b364a96321843b34f7edd2cd178d79bdd642.tar.gz
liburing-6aa9b364a96321843b34f7edd2cd178d79bdd642.tar.bz2
Add test case for exiting with SQPOLL and rings created disabled
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--.gitignore1
-rw-r--r--test/Makefile2
-rw-r--r--test/sqpoll-disable-exit.c231
3 files changed, 234 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
index f850a8c..17ec415 100644
--- a/.gitignore
+++ b/.gitignore
@@ -104,6 +104,7 @@
/test/sq-poll-dup
/test/sq-poll-kthread
/test/sq-poll-share
+/test/sqpoll-disable-exit
/test/sqpoll-exit-hang
/test/sqpoll-sleep
/test/sq-space_left
diff --git a/test/Makefile b/test/Makefile
index f02bbd1..2751f67 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -99,6 +99,7 @@ test_targets += \
sq-poll-dup \
sq-poll-kthread \
sq-poll-share \
+ sqpoll-disable-exit \
sqpoll-exit-hang \
sqpoll-sleep \
sq-space_left \
@@ -232,6 +233,7 @@ test_srcs := \
sq-poll-dup.c \
sq-poll-kthread.c \
sq-poll-share.c \
+ sqpoll-disable-exit.c \
sqpoll-exit-hang.c \
sqpoll-sleep.c \
sq-space_left.c \
diff --git a/test/sqpoll-disable-exit.c b/test/sqpoll-disable-exit.c
new file mode 100644
index 0000000..d4e17f8
--- /dev/null
+++ b/test/sqpoll-disable-exit.c
@@ -0,0 +1,231 @@
+// https://syzkaller.appspot.com/bug?id=99f4ea77bb9b9ef24cefb66469be319f4aa9f162
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#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>
+
+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
+
+#define sys_io_uring_setup 425
+static long syz_io_uring_setup(volatile long a0, volatile long a1,
+ volatile long a2, volatile long a3,
+ volatile long a4, volatile long a5)
+{
+ uint32_t entries = (uint32_t)a0;
+ struct io_uring_params* setup_params = (struct io_uring_params*)a1;
+ void* vma1 = (void*)a2;
+ void* vma2 = (void*)a3;
+ void** ring_ptr_out = (void**)a4;
+ void** sqes_ptr_out = (void**)a5;
+ uint32_t fd_io_uring = syscall(sys_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(vma1, ring_sz, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring,
+ IORING_OFF_SQ_RING);
+ uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
+ *sqes_ptr_out =
+ mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES);
+ return fd_io_uring;
+}
+
+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 < 100; 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;
+ }
+ }
+}
+
+void execute_one(void)
+{
+ *(uint32_t*)0x20000044 = 0;
+ *(uint32_t*)0x20000048 = 0x42;
+ *(uint32_t*)0x2000004c = 0;
+ *(uint32_t*)0x20000050 = 0;
+ *(uint32_t*)0x20000058 = -1;
+ *(uint32_t*)0x2000005c = 0;
+ *(uint32_t*)0x20000060 = 0;
+ *(uint32_t*)0x20000064 = 0;
+ syz_io_uring_setup(0x74bc, 0x20000040, 0x20ffb000, 0x20ffc000, 0, 0);
+}
+int main(void)
+{
+ syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
+ syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
+ syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
+ loop();
+ return 0;
+}