diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2023-52435.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2023-52435.patch | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2023-52435.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2023-52435.patch new file mode 100644 index 000000000..bd9549c73 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2023-52435.patch @@ -0,0 +1,115 @@ +From 6c53e8547687d9c767c139cd4b50af566f58c29a Mon Sep 17 00:00:00 2001 +From: Eric Dumazet <edumazet@google.com> +Date: Tue, 12 Dec 2023 16:46:21 +0000 +Subject: net: prevent mss overflow in skb_segment() + +commit 23d05d563b7e7b0314e65c8e882bc27eac2da8e7 upstream. + +Once again syzbot is able to crash the kernel in skb_segment() [1] + +GSO_BY_FRAGS is a forbidden value, but unfortunately the following +computation in skb_segment() can reach it quite easily : + + mss = mss * partial_segs; + +65535 = 3 * 5 * 17 * 257, so many initial values of mss can lead to +a bad final result. + +Make sure to limit segmentation so that the new mss value is smaller +than GSO_BY_FRAGS. + +[1] + +general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN +KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] +CPU: 1 PID: 5079 Comm: syz-executor993 Not tainted 6.7.0-rc4-syzkaller-00141-g1ae4cd3cbdd0 #0 +Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 +RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 +Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 +RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 +RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 +RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 +RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff +R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 +R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 +FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 +CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 +CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 +DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 +DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 +Call Trace: +<TASK> +udp6_ufo_fragment+0xa0e/0xd00 net/ipv6/udp_offload.c:109 +ipv6_gso_segment+0x534/0x17e0 net/ipv6/ip6_offload.c:120 +skb_mac_gso_segment+0x290/0x610 net/core/gso.c:53 +__skb_gso_segment+0x339/0x710 net/core/gso.c:124 +skb_gso_segment include/net/gso.h:83 [inline] +validate_xmit_skb+0x36c/0xeb0 net/core/dev.c:3626 +__dev_queue_xmit+0x6f3/0x3d60 net/core/dev.c:4338 +dev_queue_xmit include/linux/netdevice.h:3134 [inline] +packet_xmit+0x257/0x380 net/packet/af_packet.c:276 +packet_snd net/packet/af_packet.c:3087 [inline] +packet_sendmsg+0x24c6/0x5220 net/packet/af_packet.c:3119 +sock_sendmsg_nosec net/socket.c:730 [inline] +__sock_sendmsg+0xd5/0x180 net/socket.c:745 +__sys_sendto+0x255/0x340 net/socket.c:2190 +__do_sys_sendto net/socket.c:2202 [inline] +__se_sys_sendto net/socket.c:2198 [inline] +__x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198 +do_syscall_x64 arch/x86/entry/common.c:52 [inline] +do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 +entry_SYSCALL_64_after_hwframe+0x63/0x6b +RIP: 0033:0x7f8692032aa9 +Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 +RSP: 002b:00007fff8d685418 EFLAGS: 00000246 ORIG_RAX: 000000000000002c +RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8692032aa9 +RDX: 0000000000010048 RSI: 00000000200000c0 RDI: 0000000000000003 +RBP: 00000000000f4240 R08: 0000000020000540 R09: 0000000000000014 +R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8d685480 +R13: 0000000000000001 R14: 00007fff8d685480 R15: 0000000000000003 +</TASK> +Modules linked in: +---[ end trace 0000000000000000 ]--- +RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 +Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 +RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 +RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 +RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 +RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff +R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 +R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 +FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 +CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 +CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 +DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 +DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 + +Fixes: 3953c46c3ac7 ("sk_buff: allow segmenting based on frag sizes") +Signed-off-by: Eric Dumazet <edumazet@google.com> +Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> +Reviewed-by: Willem de Bruijn <willemb@google.com> +Link: https://lore.kernel.org/r/20231212164621.4131800-1-edumazet@google.com +Signed-off-by: Jakub Kicinski <kuba@kernel.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + net/core/skbuff.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/net/core/skbuff.c b/net/core/skbuff.c +index 7090844af4991a..3dbefce8d14b7f 100644 +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -4079,8 +4079,9 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb, + /* GSO partial only requires that we trim off any excess that + * doesn't fit into an MSS sized block, so take care of that + * now. ++ * Cap len to not accidentally hit GSO_BY_FRAGS. + */ +- partial_segs = len / mss; ++ partial_segs = min(len, GSO_BY_FRAGS - 1U) / mss; + if (partial_segs > 1) + mss *= partial_segs; + else +-- +cgit 1.2.3-korg + |