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Message-ID: <68cf9d6f.050a0220.13cd81.002c.GAE@google.com> Date: Sat, 20 Sep 2025 23:38:39 -0700 From: syzbot ci <syzbot+ci0181328b0477e4f8@...kaller.appspotmail.com> To: aleksander.lobakin@...el.com, almasrymina@...gle.com, davem@...emloft.net, ebiggers@...gle.com, edumazet@...gle.com, horms@...nel.org, kerneljasonxing@...il.com, kriish.sharma2006@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...nel.org, mhal@...x.co, netdev@...r.kernel.org, pabeni@...hat.com, skhan@...uxfoundation.org, syzbot@...kaller.appspotmail.com, willemb@...gle.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: [PATCH v2] net: skb: guard kmalloc_reserve() against oversized allocations syzbot ci has tested the following series [v1] [PATCH v2] net: skb: guard kmalloc_reserve() against oversized allocations https://lore.kernel.org/all/20250920201138.402247-1-kriish.sharma2006@gmail.com * [PATCH] [PATCH v2] net: skb: guard kmalloc_reserve() against oversized allocations and found the following issues: * WARNING in __alloc_skb * WARNING in pskb_expand_head Full report is available here: https://ci.syzbot.org/series/3048e542-7fa8-46b3-8e97-499b35ec361d *** WARNING in __alloc_skb tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 315f423be0d1ebe720d8fd4fa6bed68586b13d34 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/3d048fda-1178-4af7-acb5-2eb1a391f26b/config C repro: https://ci.syzbot.org/findings/64757740-d6bb-483c-8261-a190a051189b/c_repro syz repro: https://ci.syzbot.org/findings/64757740-d6bb-483c-8261-a190a051189b/syz_repro ------------[ cut here ]------------ kmalloc_reserve: request size 2147480000 exceeds KMALLOC_MAX_SIZE (4194304) WARNING: CPU: 0 PID: 5990 at net/core/skbuff.c:598 kmalloc_reserve+0x2df/0x2f0 net/core/skbuff.c:596 Modules linked in: CPU: 0 UID: 0 PID: 5990 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:kmalloc_reserve+0x2df/0x2f0 net/core/skbuff.c:596 Code: ff e8 d5 4a 64 f8 c6 05 67 27 32 06 01 90 b9 00 00 40 00 48 c7 c7 a0 0b 94 8c 48 c7 c6 49 5a 96 8d 4c 89 ea e8 82 e7 27 f8 90 <0f> 0b 90 90 45 31 e4 e9 37 ff ff ff 0f 1f 44 00 00 90 90 90 90 90 RSP: 0018:ffffc90002c3f798 EFLAGS: 00010246 RAX: 6aef4e9a5451c800 RBX: dffffc0000000001 RCX: ffff8881079a5640 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffffc90002c3f7e4 R08: ffff88804b024253 R09: 1ffff1100960484a R10: dffffc0000000000 R11: ffffed100960484b R12: 000000007ffff080 R13: 000000007ffff1c0 R14: 0000000000000cc0 R15: 1ffff92000587efc FS: 00005555874d6500(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000006038 CR3: 000000010b696000 CR4: 00000000000006f0 Call Trace: <TASK> __alloc_skb+0x142/0x2d0 net/core/skbuff.c:677 alloc_skb include/linux/skbuff.h:1377 [inline] sock_wmalloc+0xb2/0x130 net/core/sock.c:2798 pppol2tp_sendmsg+0x183/0x5f0 net/l2tp/l2tp_ppp.c:275 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x227/0x430 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781 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: 0033:0x7f45f258eba9 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:00007ffda5a883d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f45f27d5fa0 RCX: 00007f45f258eba9 RDX: 04000000000001ce RSI: 0000200000005f80 RDI: 0000000000000004 RBP: 00007f45f2611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008040 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f45f27d5fa0 R14: 00007f45f27d5fa0 R15: 0000000000000004 </TASK> *** WARNING in pskb_expand_head tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 315f423be0d1ebe720d8fd4fa6bed68586b13d34 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/3d048fda-1178-4af7-acb5-2eb1a391f26b/config C repro: https://ci.syzbot.org/findings/951f3d6d-b4db-4f6e-b7e5-df8d3799b0ab/c_repro syz repro: https://ci.syzbot.org/findings/951f3d6d-b4db-4f6e-b7e5-df8d3799b0ab/syz_repro ------------[ cut here ]------------ kmalloc_reserve: request size 4194368 exceeds KMALLOC_MAX_SIZE (4194304) WARNING: CPU: 1 PID: 5991 at net/core/skbuff.c:598 kmalloc_reserve+0x2df/0x2f0 net/core/skbuff.c:596 Modules linked in: CPU: 1 UID: 0 PID: 5991 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:kmalloc_reserve+0x2df/0x2f0 net/core/skbuff.c:596 Code: ff e8 d5 4a 64 f8 c6 05 67 27 32 06 01 90 b9 00 00 40 00 48 c7 c7 a0 0b 94 8c 48 c7 c6 49 5a 96 8d 4c 89 ea e8 82 e7 27 f8 90 <0f> 0b 90 90 45 31 e4 e9 37 ff ff ff 0f 1f 44 00 00 90 90 90 90 90 RSP: 0018:ffffc90003b9f6d8 EFLAGS: 00010246 RAX: a130a6a821c6fc00 RBX: dffffc0000000001 RCX: ffff88802051b980 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffffc90003b9f794 R08: ffff888136624253 R09: 1ffff11026cc484a R10: dffffc0000000000 R11: ffffed1026cc484b R12: 00000000003fff00 R13: 0000000000400040 R14: 0000000000000820 R15: 1ffff92000773ef2 FS: 00005555572cd500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30b63fff CR3: 0000000027cee000 CR4: 00000000000006f0 Call Trace: <TASK> pskb_expand_head+0x18e/0x1150 net/core/skbuff.c:2248 __skb_cow include/linux/skbuff.h:3847 [inline] skb_cow_head include/linux/skbuff.h:3881 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:360 [inline] __vlan_insert_tag include/linux/if_vlan.h:406 [inline] skb_vlan_push+0x30a/0x8d0 net/core/skbuff.c:6390 ____bpf_skb_vlan_push net/core/filter.c:3209 [inline] bpf_skb_vlan_push+0x217/0x900 net/core/filter.c:3199 bpf_prog_db72096d6b827dfb+0x4c/0x55 bpf_dispatcher_nop_func include/linux/bpf.h:1335 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] bpf_test_run+0x318/0x7b0 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0xb30/0x1560 net/bpf/test_run.c:1099 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4590 __sys_bpf+0x581/0x870 kernel/bpf/syscall.c:6047 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 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: 0033:0x7efd6458eba9 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:00007ffe070e5238 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007efd647d5fa0 RCX: 00007efd6458eba9 RDX: 0000000000000050 RSI: 0000200000000180 RDI: 000000000000000a RBP: 00007efd64611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efd647d5fa0 R14: 00007efd647d5fa0 R15: 0000000000000003 </TASK> *** 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.
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