BUG: KASAN: stack-out-of-bounds in idempotent kernel/module/main.c:3078 [inline] BUG: KASAN: stack-out-of-bounds in init_module_from_file+0x62c/0x6a0 kernel/module/main.c:3124 Read of size 8 at addr ffffc90006fdfe00 by task syz-executor.1/30860 CPU: 2 PID: 30860 Comm: syz-executor.1 Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 idempotent kernel/module/main.c:3078 [inline] init_module_from_file+0x62c/0x6a0 kernel/module/main.c:3124 __do_sys_finit_module kernel/module/main.c:3171 [inline] __se_sys_finit_module kernel/module/main.c:3154 [inline] __ia32_sys_finit_module+0xfd/0x190 kernel/module/main.c:3154 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f6a579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f445cc EFLAGS: 00000296 ORIG_RAX: 000000000000015e RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000200 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the virtual mapping at [ffffc90006fd8000, ffffc90006fe1000) created by: kernel_clone+0xeb/0x890 kernel/fork.c:2911 The buggy address belongs to the physical page: page:ffffea00005971c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x165c7 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 30819, tgid 30819 (syz-executor.1), ts 794408204688, free_ts 794385428076 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfed/0x2d30 mm/page_alloc.c:3221 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 vm_area_alloc_pages mm/vmalloc.c:3059 [inline] __vmalloc_area_node mm/vmalloc.c:3135 [inline] __vmalloc_node_range+0xb1c/0x14c0 mm/vmalloc.c:3316 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1112 [inline] copy_process+0x13bb/0x75c0 kernel/fork.c:2329 kernel_clone+0xeb/0x890 kernel/fork.c:2911 __do_compat_sys_ia32_clone+0x9e/0xd0 arch/x86/kernel/sys_ia32.c:254 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] do_int80_syscall_32+0x4a/0x90 arch/x86/entry/common.c:132 entry_INT80_compat+0x8f/0xa0 arch/x86/entry/entry_64_compat.S:353 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2348 free_unref_page+0x33/0x370 mm/page_alloc.c:2443 vfree+0x180/0x7b0 mm/vmalloc.c:2842 delayed_vfree_work+0x57/0x70 mm/vmalloc.c:2763 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffffc90006fdfd00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffffc90006fdfd80: 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 f1 >ffffc90006fdfe00: f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 f3 f3 ^ ffffc90006fdfe80: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90006fdff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi