================================================================== BUG: KASAN: vmalloc-out-of-bounds in fb_read_offset drivers/video/fbdev/core/sysmem.h:38 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:137 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0xec8/0x1758 drivers/video/fbdev/core/sysimgblt.c:24 Read of size 8 at addr ffff8000947d9ff8 by task syz.7.665/7766 CPU: 1 UID: 0 PID: 7766 Comm: syz.7.665 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 fb_read_offset drivers/video/fbdev/core/sysmem.h:38 [inline] fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:137 [inline] fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] sys_imageblit+0xec8/0x1758 drivers/video/fbdev/core/sysimgblt.c:24 drm_fbdev_shmem_defio_imageblit+0x38/0x144 drivers/gpu/drm/drm_fbdev_shmem.c:39 cw_putcs_aligned drivers/video/fbdev/core/fbcon_cw.c:111 [inline] cw_putcs+0x69c/0x8bc drivers/video/fbdev/core/fbcon_cw.c:159 fbcon_putcs+0x258/0x390 drivers/video/fbdev/core/fbcon.c:1392 do_update_region+0x31c/0x3c8 drivers/tty/vt/vt.c:656 redraw_screen+0x388/0x51c drivers/tty/vt/vt.c:1008 vc_do_resize+0x884/0xbbc drivers/tty/vt/vt.c:1309 __vc_resize+0x60/0x74 drivers/tty/vt/vt.c:1331 vc_resize include/linux/vt_kern.h:49 [inline] fbcon_do_set_font+0x3d8/0x734 drivers/video/fbdev/core/fbcon.c:2435 fbcon_set_font+0x4f0/0x6ac drivers/video/fbdev/core/fbcon.c:2518 con_font_set drivers/tty/vt/vt.c:4992 [inline] con_font_op+0x98c/0xc6c drivers/tty/vt/vt.c:5032 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1664/0x1d4c drivers/tty/vt/vt_ioctl.c:745 tty_ioctl+0x828/0xcb0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 The buggy address belongs to a vmalloc virtual mapping Memory state around the buggy address: ffff8000947d9e80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffff8000947d9f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffff8000947d9f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffff8000947da000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffff8000947da080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== Unable to handle kernel paging request at virtual address ffff8000947d9ff8 KASAN: probably user-memory-access in range [0x00000004a3ecffc0-0x00000004a3ecffc7] Mem abort info: ESR = 0x0000000096000007 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b049000 [ffff8000947d9ff8] pgd=0000000000000000, p4d=1000000221341003, pud=1000000221342003, pmd=100000010773f403, pte=0000000000000000 Internal error: Oops: 0000000096000007 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 7766 Comm: syz.7.665 Tainted: G B L syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : fb_read_offset drivers/video/fbdev/core/sysmem.h:38 [inline] pc : fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:137 [inline] pc : fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] pc : fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] pc : fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] pc : sys_imageblit+0xecc/0x1758 drivers/video/fbdev/core/sysimgblt.c:24 lr : fb_read_offset drivers/video/fbdev/core/sysmem.h:38 [inline] lr : fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:137 [inline] lr : fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] lr : fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] lr : fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] lr : sys_imageblit+0xec8/0x1758 drivers/video/fbdev/core/sysimgblt.c:24 sp : ffff800095dd7180 x29: ffff800095dd7200 x28: dfff800000000000 x27: 0000000000000020 x26: ffff8000947d9ff8 x25: 0000000000000007 x24: 0000000000000040 x23: ffff800095dd71e0 x22: 00000000000000f0 x21: ffff0000c6c119b3 x20: 0000000000000000 x19: 0000000000000020 x18: 0000000000000000 x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d x14: 3d3d3d3d3d3d3d3d x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000000000 x8 : ffffffffffffffff x7 : 0000000000000000 x6 : ffff80008048c5b8 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f62f4 x2 : 0000000000000000 x1 : ffff0000ecb69d40 x0 : 0000000000000001 Call trace: fb_right drivers/video/fbdev/core/fb_draw.h:81 [inline] (P) fb_bitblit drivers/video/fbdev/core/fb_imageblit.h:139 [inline] (P) fb_bitmap1x_imageblit drivers/video/fbdev/core/fb_imageblit.h:275 [inline] (P) fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:477 [inline] (P) fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline] (P) sys_imageblit+0xecc/0x1758 drivers/video/fbdev/core/sysimgblt.c:24 (P) drm_fbdev_shmem_defio_imageblit+0x38/0x144 drivers/gpu/drm/drm_fbdev_shmem.c:39 cw_putcs_aligned drivers/video/fbdev/core/fbcon_cw.c:111 [inline] cw_putcs+0x69c/0x8bc drivers/video/fbdev/core/fbcon_cw.c:159 fbcon_putcs+0x258/0x390 drivers/video/fbdev/core/fbcon.c:1392 do_update_region+0x31c/0x3c8 drivers/tty/vt/vt.c:656 redraw_screen+0x388/0x51c drivers/tty/vt/vt.c:1008 vc_do_resize+0x884/0xbbc drivers/tty/vt/vt.c:1309 __vc_resize+0x60/0x74 drivers/tty/vt/vt.c:1331 vc_resize include/linux/vt_kern.h:49 [inline] fbcon_do_set_font+0x3d8/0x734 drivers/video/fbdev/core/fbcon.c:2435 fbcon_set_font+0x4f0/0x6ac drivers/video/fbdev/core/fbcon.c:2518 con_font_set drivers/tty/vt/vt.c:4992 [inline] con_font_op+0x98c/0xc6c drivers/tty/vt/vt.c:5032 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1664/0x1d4c drivers/tty/vt/vt_ioctl.c:745 tty_ioctl+0x828/0xcb0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Code: 34000068 aa1a03e0 97b7a58e 92800008 (f9400349) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000068 cbz w8, 0xc 4: aa1a03e0 mov x0, x26 8: 97b7a58e bl 0xfffffffffede9640 c: 92800008 mov x8, #0xffffffffffffffff // #-1 * 10: f9400349 ldr x9, [x26] <-- trapping instruction