| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <68fb6abc.050a0220.346f24.00c9.GAE@google.com> Date: Fri, 24 Oct 2025 05:02:04 -0700 From: syzbot <syzbot+a49010a0e8fcdeea075f@...kaller.appspotmail.com> To: dmantipov@...dex.ru, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [ocfs2?] KASAN: slab-use-after-free Read in ocfs2_fault Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: UBSAN: signed-integer-overflow in ip_idents_reserve ================================================================================ UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11 1767536091 + 1282837187 cannot be represented in type 'int' CPU: 0 PID: 7041 Comm: modprobe Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: <IRQ> dump_stack+0xfd/0x16e lib/dump_stack.c:118 ubsan_epilogue+0xa/0x30 lib/ubsan.c:148 handle_overflow+0x192/0x1b0 lib/ubsan.c:180 arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] atomic_add_return include/asm-generic/atomic-instrumented.h:73 [inline] ip_idents_reserve+0x14a/0x170 net/ipv4/route.c:521 __ip_select_ident+0xe4/0x1c0 net/ipv4/route.c:538 iptunnel_xmit+0x466/0x7b0 net/ipv4/ip_tunnel_core.c:80 udp_tunnel_xmit_skb+0x1ba/0x290 net/ipv4/udp_tunnel_core.c:190 geneve_xmit_skb drivers/net/geneve.c:1004 [inline] geneve_xmit+0x1d05/0x2140 drivers/net/geneve.c:1117 __netdev_start_xmit include/linux/netdevice.h:4824 [inline] netdev_start_xmit include/linux/netdevice.h:4838 [inline] xmit_one net/core/dev.c:3601 [inline] dev_hard_start_xmit+0x294/0x780 net/core/dev.c:3617 __dev_queue_xmit+0x1678/0x28b0 net/core/dev.c:4203 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x1020/0x1490 net/ipv6/ip6_output.c:130 NF_HOOK+0x45/0x2c0 include/linux/netfilter.h:297 mld_sendpack+0x5f9/0xa70 net/ipv6/mcast.c:1676 mld_send_cr net/ipv6/mcast.c:1972 [inline] mld_ifc_timer_expire+0x7e1/0x990 net/ipv6/mcast.c:2471 call_timer_fn+0x105/0x440 kernel/time/timer.c:1444 expire_timers kernel/time/timer.c:1489 [inline] __run_timers+0x5d8/0x7a0 kernel/time/timer.c:1783 run_timer_softirq+0x19/0x30 kernel/time/timer.c:1796 __do_softirq+0x23c/0x8ae kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6d/0xb0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:423 irq_exit_rcu+0x5/0x20 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x9d/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:check_kcov_mode kernel/kcov.c:174 [inline] RIP: 0010:write_comp_data kernel/kcov.c:218 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x32/0x90 kernel/kcov.c:270 Code: 14 ba 92 7e 65 8b 0d 19 ba 92 7e f7 c1 00 01 ff 00 74 11 f7 c1 00 01 00 00 74 5b 83 ba 8c 14 00 00 00 74 52 8b 8a 68 14 00 00 <83> f9 03 75 47 48 8b 8a 70 14 00 00 44 8b 8a 6c 14 00 00 49 c1 e1 RSP: 0000:ffffc90001bcfcc0 EFLAGS: 00000246 RAX: ffffffff8191dbec RBX: ffffea0002e49201 RCX: 0000000000000000 RDX: ffff88802fad0000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffea0002e49280 R08: dffffc0000000000 R09: fffff940005c9251 R10: fffff940005c9251 R11: 1ffffd40005c9250 R12: ffffea0002e49288 R13: dffffc0000000000 R14: ffffc90001bcfd18 R15: 0000000000000000 filemap_map_pages+0x59c/0xa30 mm/filemap.c:2877 do_fault_around mm/memory.c:4089 [inline] do_read_fault mm/memory.c:4123 [inline] do_fault mm/memory.c:4256 [inline] handle_pte_fault mm/memory.c:4497 [inline] __handle_mm_fault mm/memory.c:4632 [inline] handle_mm_fault+0x16b8/0x2930 mm/memory.c:4730 do_user_addr_fault+0x468/0xa50 arch/x86/mm/fault.c:1345 handle_page_fault arch/x86/mm/fault.c:1402 [inline] exc_page_fault+0x67/0x100 arch/x86/mm/fault.c:1458 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x7fca3eee22d0 Code: 48 89 05 f3 11 19 00 f0 48 83 0c 24 00 48 8b 0d de 11 19 00 4c 8b 5c 24 30 4c 8b 54 24 28 4c 01 f9 e9 60 fe ff ff 0f 1f 40 00 <40> 84 ff 74 3b 53 48 83 ec 40 48 8b 1d c7 eb 18 00 48 8b 83 28 03 RSP: 002b:00007ffdb7892c28 EFLAGS: 00010202 RAX: 0000000000000275 RBX: 0000000000000001 RCX: 00007fca3f177300 RDX: 00007fca3ef2ccd0 RSI: 00000000000013a8 RDI: 0000000000000001 RBP: 00007ffdb7892f00 R08: 00007fca3f1786a8 R09: 0000000000000000 R10: 00007ffdb7892c30 R11: 0000000000000246 R12: fffffffffffffff8 R13: 0000002adadffe44 R14: 0000000000000000 R15: 00007fca3f17a310 ================================================================================ ---------------- Code disassembly (best guess): 0: 14 ba adc $0xba,%al 2: 92 xchg %eax,%edx 3: 7e 65 jle 0x6a 5: 8b 0d 19 ba 92 7e mov 0x7e92ba19(%rip),%ecx # 0x7e92ba24 b: f7 c1 00 01 ff 00 test $0xff0100,%ecx 11: 74 11 je 0x24 13: f7 c1 00 01 00 00 test $0x100,%ecx 19: 74 5b je 0x76 1b: 83 ba 8c 14 00 00 00 cmpl $0x0,0x148c(%rdx) 22: 74 52 je 0x76 24: 8b 8a 68 14 00 00 mov 0x1468(%rdx),%ecx * 2a: 83 f9 03 cmp $0x3,%ecx <-- trapping instruction 2d: 75 47 jne 0x76 2f: 48 8b 8a 70 14 00 00 mov 0x1470(%rdx),%rcx 36: 44 8b 8a 6c 14 00 00 mov 0x146c(%rdx),%r9d 3d: 49 rex.WB 3e: c1 .byte 0xc1 3f: e1 .byte 0xe1 Tested on: commit: d3d0b4e2 Linux 5.10.245 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y console output: https://syzkaller.appspot.com/x/log.txt?x=12ef6d42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=39182a54870857eb dashboard link: https://syzkaller.appspot.com/bug?extid=a49010a0e8fcdeea075f compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=101a93e2580000
Powered by blists - more mailing lists