C reproducer:

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h> #include <fcntl.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <unistd.h>

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) {     if (a0 == 0xc || a0 == 0xb) {         char buf[128];         sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2);         return open(buf, O_RDWR, 0);     } else {         char buf[1024];         char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1);         buf[sizeof(buf) - 1] = 0;         while ((hash = strchr(buf, '#'))) {             *hash = '0' + (char)(a1 % 10);             a1 /= 10;         }         return open(buf, a2, 0);     } }

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

int main(void) {         syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);                 intptr_t res = 0;     res = syz_open_dev(0xc, 4, 1);     if (res != -1)         r[0] = res;     syscall(__NR_ioctl, r[0], 0x4b3aul, 1ul);     res = syz_open_dev(0xc, 4, 1);     if (res != -1)         r[1] = res; *(uint16_t*)0x20000000 = 0x4d; *(uint16_t*)0x20000002 = 0x1000; *(uint16_t*)0x20000004 = 0xf1;     syscall(__NR_ioctl, r[1], 0x5609ul, 0x20000000ul);     res = syz_open_dev(0xc, 4, 1);     if (res != -1)         r[2] = res;     syscall(__NR_ioctl, r[2], 0x4b3aul, 0ul);     res = syz_open_dev(0xc, 4, 1);     if (res != -1)         r[3] = res; *(uint8_t*)0x20000840 = 0x7f; *(uint8_t*)0x20000841 = 0x45; *(uint8_t*)0x20000842 = 0x4c; *(uint8_t*)0x20000843 = 0x46; *(uint8_t*)0x20000844 = 5; *(uint8_t*)0x20000845 = 6; *(uint8_t*)0x20000846 = 5; *(uint8_t*)0x20000847 = 9; *(uint64_t*)0x20000848 = 0xfffffffffffffffa; *(uint16_t*)0x20000850 = 3; *(uint16_t*)0x20000852 = 3; *(uint32_t*)0x20000854 = 0x117; *(uint32_t*)0x20000858 = 0x45; *(uint32_t*)0x2000085c = 0x38; *(uint32_t*)0x20000860 = 0x1df; *(uint32_t*)0x20000864 = 5; *(uint16_t*)0x20000868 = 4; *(uint16_t*)0x2000086a = 0x20; *(uint16_t*)0x2000086c = 2; *(uint16_t*)0x2000086e = 0x1ff; *(uint16_t*)0x20000870 = 0x55; *(uint16_t*)0x20000872 = 0xfffb; *(uint32_t*)0x20000878 = 4; *(uint32_t*)0x2000087c = 4; *(uint32_t*)0x20000880 = 4; *(uint32_t*)0x20000884 = 1; *(uint32_t*)0x20000888 = 1; *(uint32_t*)0x2000088c = 3; *(uint32_t*)0x20000890 = 7; *(uint32_t*)0x20000894 = 0xfff; *(uint32_t*)0x20000898 = 3; *(uint32_t*)0x2000089c = 5; *(uint32_t*)0x200008a0 = 3; *(uint32_t*)0x200008a4 = 1; *(uint32_t*)0x200008a8 = 0x3f; *(uint32_t*)0x200008ac = 0x200; *(uint32_t*)0x200008b0 = 4; *(uint32_t*)0x200008b4 = 7; memcpy((void*)0x200008b8, 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4096); *(uint64_t*)0x200018b8 = 0; *(uint64_t*)0x200018c0 = 0; *(uint64_t*)0x200018c8 = 0; *(uint64_t*)0x200018d0 = 0; *(uint64_t*)0x200018d8 = 0; *(uint64_t*)0x200018e0 = 0; *(uint64_t*)0x200018e8 = 0; *(uint64_t*)0x200018f0 = 0; *(uint64_t*)0x200018f8 = 0; *(uint64_t*)0x20001900 = 0; *(uint64_t*)0x20001908 = 0; *(uint64_t*)0x20001910 = 0; *(uint64_t*)0x20001918 = 0; *(uint64_t*)0x20001920 = 0; *(uint64_t*)0x20001928 = 0; *(uint64_t*)0x20001930 = 0; *(uint64_t*)0x20001938 = 0; *(uint64_t*)0x20001940 = 0; *(uint64_t*)0x20001948 = 0; *(uint64_t*)0x20001950 = 0; *(uint64_t*)0x20001958 = 0; *(uint64_t*)0x20001960 = 0; *(uint64_t*)0x20001968 = 0; *(uint64_t*)0x20001970 = 0; *(uint64_t*)0x20001978 = 0; *(uint64_t*)0x20001980 = 0; *(uint64_t*)0x20001988 = 0; *(uint64_t*)0x20001990 = 0; *(uint64_t*)0x20001998 = 0; *(uint64_t*)0x200019a0 = 0; *(uint64_t*)0x200019a8 = 0; *(uint64_t*)0x200019b0 = 0; *(uint64_t*)0x200019b8 = 0; *(uint64_t*)0x200019c0 = 0; *(uint64_t*)0x200019c8 = 0; *(uint64_t*)0x200019d0 = 0; *(uint64_t*)0x200019d8 = 0; *(uint64_t*)0x200019e0 = 0; *(uint64_t*)0x200019e8 = 0; *(uint64_t*)0x200019f0 = 0; *(uint64_t*)0x200019f8 = 0; *(uint64_t*)0x20001a00 = 0; *(uint64_t*)0x20001a08 = 0; *(uint64_t*)0x20001a10 = 0; *(uint64_t*)0x20001a18 = 0; *(uint64_t*)0x20001a20 = 0; *(uint64_t*)0x20001a28 = 0; *(uint64_t*)0x20001a30 = 0; *(uint64_t*)0x20001a38 = 0; *(uint64_t*)0x20001a40 = 0; *(uint64_t*)0x20001a48 = 0; *(uint64_t*)0x20001a50 = 0; *(uint64_t*)0x20001a58 = 0; *(uint64_t*)0x20001a60 = 0; *(uint64_t*)0x20001a68 = 0; *(uint64_t*)0x20001a70 = 0; *(uint64_t*)0x20001a78 = 0; *(uint64_t*)0x20001a80 = 0; *(uint64_t*)0x20001a88 = 0; *(uint64_t*)0x20001a90 = 0; *(uint64_t*)0x20001a98 = 0; *(uint64_t*)0x20001aa0 = 0; *(uint64_t*)0x20001aa8 = 0; *(uint64_t*)0x20001ab0 = 0; *(uint64_t*)0x20001ab8 = 0; *(uint64_t*)0x20001ac0 = 0; *(uint64_t*)0x20001ac8 = 0; *(uint64_t*)0x20001ad0 = 0; *(uint64_t*)0x20001ad8 = 0; *(uint64_t*)0x20001ae0 = 0; *(uint64_t*)0x20001ae8 = 0; *(uint64_t*)0x20001af0 = 0; *(uint64_t*)0x20001af8 = 0; *(uint64_t*)0x20001b00 = 0; *(uint64_t*)0x20001b08 = 0; *(uint64_t*)0x20001b10 = 0; *(uint64_t*)0x20001b18 = 0; *(uint64_t*)0x20001b20 = 0; *(uint64_t*)0x20001b28 = 0; *(uint64_t*)0x20001b30 = 0; *(uint64_t*)0x20001b38 = 0; *(uint64_t*)0x20001b40 = 0; *(uint64_t*)0x20001b48 = 0; *(uint64_t*)0x20001b50 = 0; *(uint64_t*)0x20001b58 = 0; *(uint64_t*)0x20001b60 = 0; *(uint64_t*)0x20001b68 = 0; *(uint64_t*)0x20001b70 = 0; *(uint64_t*)0x20001b78 = 0; *(uint64_t*)0x20001b80 = 0; *(uint64_t*)0x20001b88 = 0; *(uint64_t*)0x20001b90 = 0; *(uint64_t*)0x20001b98 = 0; *(uint64_t*)0x20001ba0 = 0; *(uint64_t*)0x20001ba8 = 0; *(uint64_t*)0x20001bb0 = 0; *(uint64_t*)0x20001bb8 = 0; *(uint64_t*)0x20001bc0 = 0; *(uint64_t*)0x20001bc8 = 0; *(uint64_t*)0x20001bd0 = 0; *(uint64_t*)0x20001bd8 = 0; *(uint64_t*)0x20001be0 = 0; *(uint64_t*)0x20001be8 = 0; *(uint64_t*)0x20001bf0 = 0; *(uint64_t*)0x20001bf8 = 0; *(uint64_t*)0x20001c00 = 0; *(uint64_t*)0x20001c08 = 0; *(uint64_t*)0x20001c10 = 0; *(uint64_t*)0x20001c18 = 0; *(uint64_t*)0x20001c20 = 0; *(uint64_t*)0x20001c28 = 0; *(uint64_t*)0x20001c30 = 0; *(uint64_t*)0x20001c38 = 0; *(uint64_t*)0x20001c40 = 0; *(uint64_t*)0x20001c48 = 0; *(uint64_t*)0x20001c50 = 0; *(uint64_t*)0x20001c58 = 0; *(uint64_t*)0x20001c60 = 0; *(uint64_t*)0x20001c68 = 0; *(uint64_t*)0x20001c70 = 0; *(uint64_t*)0x20001c78 = 0; *(uint64_t*)0x20001c80 = 0; *(uint64_t*)0x20001c88 = 0; *(uint64_t*)0x20001c90 = 0; *(uint64_t*)0x20001c98 = 0; *(uint64_t*)0x20001ca0 = 0; *(uint64_t*)0x20001ca8 = 0; *(uint64_t*)0x20001cb0 = 0; *(uint64_t*)0x20001cb8 = 0; *(uint64_t*)0x20001cc0 = 0; *(uint64_t*)0x20001cc8 = 0; *(uint64_t*)0x20001cd0 = 0; *(uint64_t*)0x20001cd8 = 0; *(uint64_t*)0x20001ce0 = 0; *(uint64_t*)0x20001ce8 = 0; *(uint64_t*)0x20001cf0 = 0; *(uint64_t*)0x20001cf8 = 0; *(uint64_t*)0x20001d00 = 0; *(uint64_t*)0x20001d08 = 0; *(uint64_t*)0x20001d10 = 0; *(uint64_t*)0x20001d18 = 0; *(uint64_t*)0x20001d20 = 0; *(uint64_t*)0x20001d28 = 0; *(uint64_t*)0x20001d30 = 0; *(uint64_t*)0x20001d38 = 0; *(uint64_t*)0x20001d40 = 0; *(uint64_t*)0x20001d48 = 0; *(uint64_t*)0x20001d50 = 0; *(uint64_t*)0x20001d58 = 0; *(uint64_t*)0x20001d60 = 0; *(uint64_t*)0x20001d68 = 0; *(uint64_t*)0x20001d70 = 0; *(uint64_t*)0x20001d78 = 0; *(uint64_t*)0x20001d80 = 0; *(uint64_t*)0x20001d88 = 0; *(uint64_t*)0x20001d90 = 0; *(uint64_t*)0x20001d98 = 0; *(uint64_t*)0x20001da0 = 0; *(uint64_t*)0x20001da8 = 0; *(uint64_t*)0x20001db0 = 0; *(uint64_t*)0x20001db8 = 0; *(uint64_t*)0x20001dc0 = 0; *(uint64_t*)0x20001dc8 = 0; *(uint64_t*)0x20001dd0 = 0; *(uint64_t*)0x20001dd8 = 0; *(uint64_t*)0x20001de0 = 0; *(uint64_t*)0x20001de8 = 0; *(uint64_t*)0x20001df0 = 0; *(uint64_t*)0x20001df8 = 0; *(uint64_t*)0x20001e00 = 0; *(uint64_t*)0x20001e08 = 0; *(uint64_t*)0x20001e10 = 0; *(uint64_t*)0x20001e18 = 0; *(uint64_t*)0x20001e20 = 0; *(uint64_t*)0x20001e28 = 0; *(uint64_t*)0x20001e30 = 0; *(uint64_t*)0x20001e38 = 0; *(uint64_t*)0x20001e40 = 0; *(uint64_t*)0x20001e48 = 0; *(uint64_t*)0x20001e50 = 0; *(uint64_t*)0x20001e58 = 0; *(uint64_t*)0x20001e60 = 0; *(uint64_t*)0x20001e68 = 0; *(uint64_t*)0x20001e70 = 0; *(uint64_t*)0x20001e78 = 0; *(uint64_t*)0x20001e80 = 0; *(uint64_t*)0x20001e88 = 0; *(uint64_t*)0x20001e90 = 0; *(uint64_t*)0x20001e98 = 0; *(uint64_t*)0x20001ea0 = 0; *(uint64_t*)0x20001ea8 = 0; *(uint64_t*)0x20001eb0 = 0; *(uint64_t*)0x20001eb8 = 0; *(uint64_t*)0x20001ec0 = 0; *(uint64_t*)0x20001ec8 = 0; *(uint64_t*)0x20001ed0 = 0; *(uint64_t*)0x20001ed8 = 0; *(uint64_t*)0x20001ee0 = 0; *(uint64_t*)0x20001ee8 = 0; *(uint64_t*)0x20001ef0 = 0; *(uint64_t*)0x20001ef8 = 0; *(uint64_t*)0x20001f00 = 0; *(uint64_t*)0x20001f08 = 0; *(uint64_t*)0x20001f10 = 0; *(uint64_t*)0x20001f18 = 0; *(uint64_t*)0x20001f20 = 0; *(uint64_t*)0x20001f28 = 0; *(uint64_t*)0x20001f30 = 0; *(uint64_t*)0x20001f38 = 0; *(uint64_t*)0x20001f40 = 0; *(uint64_t*)0x20001f48 = 0; *(uint64_t*)0x20001f50 = 0; *(uint64_t*)0x20001f58 = 0; *(uint64_t*)0x20001f60 = 0; *(uint64_t*)0x20001f68 = 0; *(uint64_t*)0x20001f70 = 0; *(uint64_t*)0x20001f78 = 0; *(uint64_t*)0x20001f80 = 0; *(uint64_t*)0x20001f88 = 0; *(uint64_t*)0x20001f90 = 0; *(uint64_t*)0x20001f98 = 0; *(uint64_t*)0x20001fa0 = 0; *(uint64_t*)0x20001fa8 = 0; *(uint64_t*)0x20001fb0 = 0; *(uint64_t*)0x20001fb8 = 0; *(uint64_t*)0x20001fc0 = 0; *(uint64_t*)0x20001fc8 = 0; *(uint64_t*)0x20001fd0 = 0; *(uint64_t*)0x20001fd8 = 0; *(uint64_t*)0x20001fe0 = 0; *(uint64_t*)0x20001fe8 = 0; *(uint64_t*)0x20001ff0 = 0; *(uint64_t*)0x20001ff8 = 0; *(uint64_t*)0x20002000 = 0; *(uint64_t*)0x20002008 = 0; *(uint64_t*)0x20002010 = 0; *(uint64_t*)0x20002018 = 0; *(uint64_t*)0x20002020 = 0; *(uint64_t*)0x20002028 = 0; *(uint64_t*)0x20002030 = 0; *(uint64_t*)0x20002038 = 0; *(uint64_t*)0x20002040 = 0; *(uint64_t*)0x20002048 = 0; *(uint64_t*)0x20002050 = 0; *(uint64_t*)0x20002058 = 0; *(uint64_t*)0x20002060 = 0; *(uint64_t*)0x20002068 = 0; *(uint64_t*)0x20002070 = 0; *(uint64_t*)0x20002078 = 0; *(uint64_t*)0x20002080 = 0; *(uint64_t*)0x20002088 = 0; *(uint64_t*)0x20002090 = 0; *(uint64_t*)0x20002098 = 0; *(uint64_t*)0x200020a0 = 0; *(uint64_t*)0x200020a8 = 0; *(uint64_t*)0x200020b0 = 0;     syscall(__NR_write, r[3], 0x20000840ul, 0x1878ul);     return 0; }

On 2020/10/20 17:02, Yang Yingliang wrote:

I got a UAF report in do_update_region() when I doing fuzz test.

[   51.161905] BUG: KASAN: use-after-free in do_update_region+0x579/0x600 [   51.161918] Read of size 2 at addr ffff888000100000 by task test/295

[   51.161957] CPU: 2 PID: 295 Comm: test Not tainted 5.7.0+ #975 [   51.161969] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [   51.161976] Call Trace: [   51.162001]  dump_stack+0xc6/0x11e [   51.162019]  ? do_update_region+0x579/0x600 [   51.162047]  print_address_description.constprop.6+0x1a/0x220 [   51.162083]  ? vprintk_func+0x66/0xed [   51.162100]  ? do_update_region+0x579/0x600 [   51.162112]  ? do_update_region+0x579/0x600 [   51.162128]  kasan_report.cold.9+0x37/0x7c [   51.162151]  ? do_update_region+0x579/0x600 [   51.162173]  do_update_region+0x579/0x600 [   51.162207]  ? con_get_trans_old+0x230/0x230 [   51.162229]  ? retint_kernel+0x10/0x10 [   51.162278]  csi_J+0x557/0xa00 [   51.162307]  do_con_trol+0x49af/0x5cc0 [   51.162330]  ? lock_downgrade+0x720/0x720 [   51.162347]  ? reset_palette+0x1b0/0x1b0 [   51.162369]  ? lockdep_hardirqs_on_prepare+0x379/0x540 [   51.162393]  ? notifier_call_chain+0x11b/0x160 [   51.162438]  do_con_write.part.24+0xb0a/0x1a30 [   51.162501]  ? do_con_trol+0x5cc0/0x5cc0 [   51.162522]  ? console_unlock+0x7b8/0xb00 [   51.162555]  ? __mutex_unlock_slowpath+0xd4/0x670 [   51.162574]  ? this_tty+0xe0/0xe0 [   51.162589]  ? console_unlock+0x559/0xb00 [   51.162605]  ? wait_for_completion+0x260/0x260 [   51.162638]  con_write+0x31/0xb0 [   51.162658]  n_tty_write+0x4fa/0xd40 [   51.162710]  ? n_tty_read+0x1800/0x1800 [   51.162730]  ? prepare_to_wait_exclusive+0x270/0x270 [   51.162754]  ? __might_fault+0x175/0x1b0 [   51.162783]  tty_write+0x42b/0x8d0 [   51.162795]  ? n_tty_read+0x1800/0x1800 [   51.162825]  ? tty_lookup_driver+0x450/0x450 [   51.162848]  __vfs_write+0x7c/0x100 [   51.162875]  vfs_write+0x1c9/0x510 [   51.162901]  ksys_write+0xff/0x200 [   51.162918]  ? __ia32_sys_read+0xb0/0xb0 [   51.162940]  ? do_syscall_64+0x1a/0x520 [   51.162957]  ? lockdep_hardirqs_on_prepare+0x379/0x540 [   51.162984]  do_syscall_64+0xa1/0x520 [   51.163008]  entry_SYSCALL_64_after_hwframe+0x49/0xb3

After vgacon_set_origin() is called in set_origin(), the vc_origin is set to vga_vram_base, the vc_pos should between vga_vram_base and vga_vram_end. But we still use vc_screenbuf_size, if the vga_vram_size is smaller than vc_screenbuf_size, vc_pos may be out of bound, using it will cause a use-after-free(or out-of-bounds). Fix this by calling vc_resize() if vga_vram_size is smaller than vc_screenbuf_size.

Signed-off-by: Yang Yingliangyangyingliang@huawei.com

drivers/video/console/vgacon.c | 3 +++  1 file changed, 3 insertions(+)

diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 998b0de..2ee3d62 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -1336,6 +1336,9 @@ static int vgacon_set_origin(struct vc_data *c)      if (vga_is_gfx ||    /* We don't play origin tricks in graphic modes */          (console_blanked && !vga_palette_blanked))    /* Nor we write to blanked screens */          return 0;

+    if (c->vc_screenbuf_size > vga_vram_size) +        vc_resize(c, screen_info.orig_video_cols, screen_info.orig_video_lines);      c->vc_origin = c->vc_visible_origin = vga_vram_base;      vga_set_mem_top(c);      vga_rolled_over = 0;

.