Re: [syzbot] [net?] [s390?] Unable to handle kernel execute from non-executable memory at virtual address ADDR

[syzbot <syzbot+8798e95c2e5511646dac@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    8936d33c1f69 Merge remote-tracking branch 'tip/irq/core' i..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=16aaae30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=163d7426d94ed7f
dashboard link: https://syzkaller.appspot.com/bug?extid=8798e95c2e5511646dac
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11aaae30580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1289cd87980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c58cd818af34/disk-8936d33c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0e687204404/vmlinux-8936d33c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/efc94fae8d41/Image-8936d33c.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8798e95c2e5511646dac@syzkaller.appspotmail.com

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
Unable to handle kernel execute from non-executable memory at virtual address ffff0000d1080b80
KASAN: maybe wild-memory-access in range [0xfffc000688405c00-0xfffc000688405c07]
Mem abort info:
  ESR = 0x000000008600000f
  EC = 0x21: IABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x0f: level 3 permission fault
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001bd31d000
[ffff0000d1080b80] pgd=0000000000000000, p4d=180000023ffff403, pud=180000023f41b403, pmd=180000023f392403, pte=0068000111080707
Internal error: Oops: 000000008600000f [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6416 Comm: syz-executor278 Not tainted 6.12.0-rc6-syzkaller-g8936d33c1f69 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0xffff0000d1080b80
lr : smc_fback_forward_wakeup+0x1dc/0x514 net/smc/af_smc.c:822
sp : ffff8000a3b97140
x29: ffff8000a3b97210 x28: 1fffe00019a901c8 x27: ffff8000a3b97160
x26: dfff800000000000 x25: ffff700014772e2c x24: ffff8000a3b97190
x23: ffff0000cd480e40 x22: ffff0000cd480cc0 x21: ffff0000d1080b80
x20: ffff8000a3b97180 x19: ffff0000dde73040 x18: ffff8000a3b96da0
x17: 000000000000fc8e x16: ffff8000802ae4a0 x15: 0000000000000001
x14: 1fffe0001bbce608 x13: ffff8000a3b98000 x12: 0000000000000003
x11: 0000000000000202 x10: 0000000000000000 x9 : 1fffe000185b0001
x8 : 0000000100000201 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000020 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000003 x1 : ffff80008b626000 x0 : ffff0000cd480cc0
Call trace:
 0xffff0000d1080b80 (P)
 smc_fback_forward_wakeup+0x1dc/0x514 net/smc/af_smc.c:822 (L)
 smc_fback_data_ready+0x88/0xac net/smc/af_smc.c:850
 tcp_data_ready+0x22c/0x44c net/ipv4/tcp_input.c:5220
 tcp_data_queue+0x18a4/0x4eb8 net/ipv4/tcp_input.c:5310
 tcp_rcv_established+0xe10/0x2018 net/ipv4/tcp_input.c:6264
 tcp_v4_do_rcv+0x3b8/0xc44 net/ipv4/tcp_ipv4.c:1915
 sk_backlog_rcv include/net/sock.h:1115 [inline]
 __release_sock+0x1a8/0x3d8 net/core/sock.c:3072
 __sk_flush_backlog+0x38/0xa4 net/core/sock.c:3092
 sk_flush_backlog include/net/sock.h:1178 [inline]
 tcp_sendmsg_locked+0x3118/0x3eb8 net/ipv4/tcp.c:1163
 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1357
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:853
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg net/socket.c:744 [inline]
 __sys_sendto+0x374/0x4f4 net/socket.c:2214
 __do_sys_sendto net/socket.c:2226 [inline]
 __se_sys_sendto net/socket.c:2222 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2222
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 00000000 00000000 00000000 00000000 (00000000) 
---[ end trace 0000000000000000 ]---


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