[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 138.594973][ T8225] ===================================================== [ 138.602156][ T8225] BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 [ 138.603344][ T8225] CPU: 1 PID: 8225 Comm: syz-executor269 Not tainted 5.11.0-rc7-syzkaller #0 [ 138.603344][ T8225] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 138.603344][ T8225] Call Trace: [ 138.603344][ T8225] dump_stack+0x21c/0x280 [ 138.603344][ T8225] kmsan_report+0xfb/0x1e0 [ 138.603344][ T8225] kmsan_internal_check_memory+0x484/0x520 [ 138.603344][ T8225] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 138.603344][ T8225] ? should_fail+0x72/0x9e0 [ 138.603344][ T8225] kmsan_copy_to_user+0x9c/0xb0 [ 138.603344][ T8225] _copy_to_user+0x1ac/0x270 [ 138.603344][ T8225] fb_cmap_to_user+0x40a/0x990 [ 138.603344][ T8225] do_fb_ioctl+0xc53/0x1090 [ 138.603344][ T8225] ? kmsan_get_metadata+0x116/0x180 [ 138.603344][ T8225] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 [ 138.603344][ T8225] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 138.603344][ T8225] ? do_vfs_ioctl+0x117f/0x3510 [ 138.603344][ T8225] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 [ 138.603344][ T8225] ? kmsan_get_metadata+0x116/0x180 [ 138.713646][ T8225] fb_ioctl+0x1e4/0x210 [ 138.713646][ T8225] ? fb_write+0xd80/0xd80 [ 138.713646][ T8225] __se_sys_ioctl+0x311/0x4d0 [ 138.713646][ T8225] __x64_sys_ioctl+0x4a/0x70 [ 138.713646][ T8225] do_syscall_64+0x9f/0x140 [ 138.713646][ T8225] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 138.713646][ T8225] RIP: 0033:0x43fbd9 [ 138.713646][ T8225] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 138.713646][ T8225] RSP: 002b:00007ffc68acbf98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 138.713646][ T8225] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043fbd9 [ 138.713646][ T8225] RDX: 0000000020007400 RSI: 0000000000004604 RDI: 0000000000000003 [ 138.713646][ T8225] RBP: 0000000000000000 R08: 00007ffc68acc138 R09: 00007ffc68acc138 [ 138.713646][ T8225] R10: 00007ffc68acba10 R11: 0000000000000246 R12: 0000000000403460 [ 138.713646][ T8225] R13: 431bde82d7b634db R14: 00000000004ad018 R15: 0000000000400488 [ 138.713646][ T8225] [ 138.713646][ T8225] Uninit was created at: [ 138.713646][ T8225] kmsan_internal_poison_shadow+0x5c/0xf0 [ 138.713646][ T8225] kmsan_slab_alloc+0x8d/0xe0 [ 138.713646][ T8225] __kmalloc+0x378/0x560 [ 138.713646][ T8225] fb_alloc_cmap_gfp+0x39b/0xa70 [ 138.713646][ T8225] fb_alloc_cmap+0x95/0xb0 [ 138.713646][ T8225] drm_fb_helper_alloc_fbi+0x106/0x3f0 [ 138.713646][ T8225] drm_fb_helper_generic_probe+0x4f3/0xc70 [ 138.713646][ T8225] __drm_fb_helper_initial_config_and_unlock+0x1cac/0x26c0 [ 138.713646][ T8225] drm_fbdev_client_hotplug+0xbb8/0xd70 [ 138.713646][ T8225] drm_fbdev_generic_setup+0x39d/0xa00 [ 138.713646][ T8225] vkms_init+0x880/0xa02 [ 138.713646][ T8225] do_one_initcall+0x362/0x8d0 [ 138.713646][ T8225] do_initcall_level+0x1e7/0x35a [ 138.713646][ T8225] do_initcalls+0x127/0x1cb [ 138.713646][ T8225] do_basic_setup+0x33/0x36 [ 138.713646][ T8225] kernel_init_freeable+0x23d/0x390 [ 138.713646][ T8225] kernel_init+0x1f/0x840 [ 138.713646][ T8225] ret_from_fork+0x1f/0x30 [ 138.713646][ T8225] [ 138.713646][ T8225] Bytes 0-1 of 2 are uninitialized [ 138.713646][ T8225] Memory access of size 2 starts at ffff8881455651c0 [ 138.713646][ T8225] Data copied to user address 0000000020007300 [ 138.713646][ T8225] ===================================================== [ 138.713646][ T8225] Disabling lock debugging due to kernel taint [ 138.713646][ T8225] Kernel panic - not syncing: panic_on_warn set ... [ 138.713646][ T8225] CPU: 1 PID: 8225 Comm: syz-executor269 Tainted: G B 5.11.0-rc7-syzkaller #0 [ 138.713646][ T8225] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 138.713646][ T8225] Call Trace: [ 138.713646][ T8225] dump_stack+0x21c/0x280 [ 138.713646][ T8225] panic+0x4c6/0xea7 [ 138.713646][ T8225] ? add_taint+0x17c/0x210 [ 138.713646][ T8225] kmsan_report+0x1de/0x1e0 [ 138.713646][ T8225] kmsan_internal_check_memory+0x484/0x520 [ 138.713646][ T8225] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 138.713646][ T8225] ? should_fail+0x72/0x9e0 [ 138.713646][ T8225] kmsan_copy_to_user+0x9c/0xb0 [ 138.713646][ T8225] _copy_to_user+0x1ac/0x270 [ 138.713646][ T8225] fb_cmap_to_user+0x40a/0x990 [ 138.713646][ T8225] do_fb_ioctl+0xc53/0x1090 [ 139.034571][ T8225] ? kmsan_get_metadata+0x116/0x180 [ 139.040659][ T8225] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 [ 139.046767][ T8225] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 139.052836][ T8225] ? do_vfs_ioctl+0x117f/0x3510 [ 139.057700][ T8225] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 [ 139.063764][ T8225] ? kmsan_get_metadata+0x116/0x180 [ 139.069841][ T8225] fb_ioctl+0x1e4/0x210 [ 139.073749][ T8225] ? fb_write+0xd80/0xd80 [ 139.077404][ T8225] __se_sys_ioctl+0x311/0x4d0 [ 139.082324][ T8225] __x64_sys_ioctl+0x4a/0x70 [ 139.087353][ T8225] do_syscall_64+0x9f/0x140 [ 139.092307][ T8225] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 139.097412][ T8225] RIP: 0033:0x43fbd9 [ 139.102288][ T8225] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 139.121065][ T8225] RSP: 002b:00007ffc68acbf98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 139.129770][ T8225] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043fbd9 [ 139.138620][ T8225] RDX: 0000000020007400 RSI: 0000000000004604 RDI: 0000000000000003 [ 139.146072][ T8225] RBP: 0000000000000000 R08: 00007ffc68acc138 R09: 00007ffc68acc138 [ 139.154579][ T8225] R10: 00007ffc68acba10 R11: 0000000000000246 R12: 0000000000403460 [ 139.161958][ T8225] R13: 431bde82d7b634db R14: 00000000004ad018 R15: 0000000000400488 [ 139.170482][ T8225] Kernel Offset: disabled [ 139.170482][ T8225] Rebooting in 86400 seconds..