| 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: <68d77d74.a00a0220.102ee.000e.GAE@google.com> Date: Fri, 26 Sep 2025 23:00:20 -0700 From: syzbot ci <syzbot+ci88b77c4aee0f7057@...kaller.appspotmail.com> To: almasrymina@...gle.com, bobbyeshleman@...il.com, bobbyeshleman@...a.com, davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, kuniyu@...gle.com, linux-kernel@...r.kernel.org, ncardwell@...gle.com, netdev@...r.kernel.org, pabeni@...hat.com, sdf@...ichev.me, willemb@...gle.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: net: devmem: improve cpu cost of RX token management syzbot ci has tested the following series [v4] net: devmem: improve cpu cost of RX token management https://lore.kernel.org/all/20250926-scratch-bobbyeshleman-devmem-tcp-token-upstream-v4-0-39156563c3ea@meta.com * [PATCH net-next v4 1/2] net: devmem: rename tx_vec to vec in dmabuf binding * [PATCH net-next v4 2/2] net: devmem: use niov array for token management and found the following issue: general protection fault in sock_devmem_dontneed Full report is available here: https://ci.syzbot.org/series/b8209bd4-e9f0-4c54-bad3-613e8431151b *** general protection fault in sock_devmem_dontneed tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: dc1dea796b197aba2c3cae25bfef45f4b3ad46fe arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/b4d90fd9-9fbe-4e17-8fc0-3d6603df09da/config C repro: https://ci.syzbot.org/findings/ce81b3c3-3db8-4643-9731-cbe331c65fdb/c_repro syz repro: https://ci.syzbot.org/findings/ce81b3c3-3db8-4643-9731-cbe331c65fdb/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5996 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:sock_devmem_dontneed+0x372/0x920 net/core/sock.c:1113 Code: 48 44 8b 20 44 89 74 24 54 45 01 f4 48 8b 44 24 60 42 80 3c 28 00 74 08 48 89 df e8 e8 5a c9 f8 4c 8b 33 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 cf 5a c9 f8 4d 8b 3e 4c 89 f8 48 RSP: 0018:ffffc90002a1fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88810a8ab710 RCX: 1ffff11023002f45 RDX: ffff88801b339cc0 RSI: 0000000000002000 RDI: 0000000000000000 RBP: ffffc90002a1fc50 R08: ffffc90002a1fbdf R09: 0000000000000000 R10: ffffc90002a1fb60 R11: fffff52000543f7c R12: 0000000000f07000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810a8ab710 FS: 000055556f85a500(0000) GS:ffff8881a3c3d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000a2000 CR3: 0000000024516000 CR4: 00000000000006f0 Call Trace: <TASK> sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1304 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fea0438ec29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd04a8f368 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fea045d5fa0 RCX: 00007fea0438ec29 RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007fea04411e41 R08: 0000000000000010 R09: 0000000000000000 R10: 00002000000a2000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fea045d5fa0 R14: 00007fea045d5fa0 R15: 0000000000000005 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sock_devmem_dontneed+0x372/0x920 net/core/sock.c:1113 Code: 48 44 8b 20 44 89 74 24 54 45 01 f4 48 8b 44 24 60 42 80 3c 28 00 74 08 48 89 df e8 e8 5a c9 f8 4c 8b 33 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 cf 5a c9 f8 4d 8b 3e 4c 89 f8 48 RSP: 0018:ffffc90002a1fac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88810a8ab710 RCX: 1ffff11023002f45 RDX: ffff88801b339cc0 RSI: 0000000000002000 RDI: 0000000000000000 RBP: ffffc90002a1fc50 R08: ffffc90002a1fbdf R09: 0000000000000000 R10: ffffc90002a1fb60 R11: fffff52000543f7c R12: 0000000000f07000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810a8ab710 FS: 000055556f85a500(0000) GS:ffff8881a3c3d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000a2000 CR3: 0000000024516000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 48 rex.W 1: 44 8b 20 mov (%rax),%r12d 4: 44 89 74 24 54 mov %r14d,0x54(%rsp) 9: 45 01 f4 add %r14d,%r12d c: 48 8b 44 24 60 mov 0x60(%rsp),%rax 11: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 e8 5a c9 f8 call 0xf8c95b08 20: 4c 8b 33 mov (%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 cf 5a c9 f8 call 0xf8c95b08 39: 4d 8b 3e mov (%r14),%r15 3c: 4c 89 f8 mov %r15,%rax 3f: 48 rex.W *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
Powered by blists - more mailing lists