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KASAN: slab-out-of-bounds Read in do_update_region | 0 (1) | 2020/09/14 09:34 |
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KASAN: slab-out-of-bounds Read in do_update_region | 0 (1) | 2020/09/14 09:34 |
================================================================== BUG: KASAN: slab-out-of-bounds in do_update_region+0x5aa/0x630 drivers/tty/vt/vt.c:663 Read of size 2 at addr ffff888218bbd2c0 by task syz-executor.3/21923 CPU: 1 PID: 21923 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 do_update_region+0x5aa/0x630 drivers/tty/vt/vt.c:663 update_region+0xb5/0x140 drivers/tty/vt/vt.c:693 vcs_write+0x403/0xc30 drivers/tty/vt/vc_screen.c:623 do_loop_readv_writev fs/read_write.c:737 [inline] do_loop_readv_writev fs/read_write.c:721 [inline] do_iter_write+0x489/0x670 fs/read_write.c:1020 vfs_writev+0x1aa/0x2e0 fs/read_write.c:1091 do_writev+0x139/0x300 fs/read_write.c:1134 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f831f788c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000039c40 RCX: 000000000045d5f9 RDX: 0000000000000002 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc44f8988f R14: 00007f831f7899c0 R15: 000000000118cf4c Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x1b0/0x310 mm/slab.c:3664 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:666 [inline] vc_do_resize+0x2f6/0x1150 drivers/tty/vt/vt.c:1228 fbcon_init+0x1319/0x1b00 drivers/video/fbdev/core/fbcon.c:1218 visual_init+0x30e/0x5d0 drivers/tty/vt/vt.c:1074 do_bind_con_driver.isra.0+0x549/0x8e0 drivers/tty/vt/vt.c:3658 do_take_over_console+0x423/0x570 drivers/tty/vt/vt.c:4238 do_fbcon_takeover+0x10b/0x210 drivers/video/fbdev/core/fbcon.c:588 fbcon_fb_registered+0x26b/0x340 drivers/video/fbdev/core/fbcon.c:3283 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1660 [inline] register_framebuffer+0x587/0x980 drivers/video/fbdev/core/fbmem.c:1828 vga16fb_probe+0x6b4/0x7b5 drivers/video/fbdev/vga16fb.c:1373 platform_drv_probe+0x87/0x140 drivers/base/platform.c:747 really_probe+0x282/0x9f0 drivers/base/dd.c:553 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:738 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x470 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb17/0x1c40 drivers/base/core.c:2926 platform_device_add+0x34f/0x6d0 drivers/base/platform.c:597 vga16fb_init+0x152/0x1c8 drivers/video/fbdev/vga16fb.c:1431 do_one_initcall+0x10a/0x7a4 init/main.c:1204 do_initcall_level init/main.c:1277 [inline] do_initcalls init/main.c:1293 [inline] do_basic_setup init/main.c:1313 [inline] kernel_init_freeable+0x5e9/0x66d init/main.c:1512 kernel_init+0xd/0x1c0 init/main.c:1402 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff888218bbc000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4800 bytes inside of 8192-byte region [ffff888218bbc000, ffff888218bbe000) The buggy address belongs to the page: page:00000000b53090a6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x218bbc head:00000000b53090a6 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x57ffe0000010200(slab|head) raw: 057ffe0000010200 ffffea0008654508 ffffea0008603708 ffff8880aa040a00 raw: 0000000000000000 ffff888218bbc000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888218bbd180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888218bbd200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888218bbd280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888218bbd300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888218bbd380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
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2020/09/14 06:54 | upstream | e4c26faa426c | 2d3cdd63 | .config | console log | report | ci-upstream-kasan-gce-selinux-root |