[syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    88264981f208 Merge tag 'sched_ext-for-6.12' of git://git.k..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=172c4107980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=547de13ee0a4d284
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d7c19f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c81c27980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d83fc781c223/disk-88264981.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1ed4c5969fba/vmlinux-88264981.xz
kernel image: https://storage.googleapis.com/syzbot-assets/76a67bd894be/bzImage-88264981.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in _inline_copy_to_user include/linux/uaccess.h:180 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:26
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 _inline_copy_to_user include/linux/uaccess.h:180 [inline]
 _copy_to_user+0xbc/0x110 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:209 [inline]
 move_addr_to_user+0x28b/0x400 net/socket.c:292
 ____sys_recvmsg+0x232/0x620 net/socket.c:2829
 ___sys_recvmsg+0x223/0x840 net/socket.c:2864
 do_recvmmsg+0x4f6/0xfd0 net/socket.c:2958
 __sys_recvmmsg net/socket.c:3037 [inline]
 __do_sys_recvmmsg net/socket.c:3060 [inline]
 __se_sys_recvmmsg net/socket.c:3053 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3053
 x64_sys_call+0x2e5d/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 packet_recvmsg+0x176a/0x2500 net/packet/af_packet.c:3585
 sock_recvmsg_nosec+0x22f/0x2b0 net/socket.c:1052
 ____sys_recvmsg+0x541/0x620 net/socket.c:2820
 ___sys_recvmsg+0x223/0x840 net/socket.c:2864
 do_recvmmsg+0x4f6/0xfd0 net/socket.c:2958
 __sys_recvmmsg net/socket.c:3037 [inline]
 __do_sys_recvmmsg net/socket.c:3060 [inline]
 __se_sys_recvmmsg net/socket.c:3053 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3053
 x64_sys_call+0x2e5d/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 eth_header_parse+0xb8/0x110 net/ethernet/eth.c:204
 dev_parse_header include/linux/netdevice.h:3158 [inline]
 packet_rcv+0xefc/0x2050 net/packet/af_packet.c:2253
 dev_queue_xmit_nit+0x114b/0x12a0 net/core/dev.c:2347
 xmit_one net/core/dev.c:3584 [inline]
 dev_hard_start_xmit+0x17d/0xa20 net/core/dev.c:3604
 __dev_queue_xmit+0x3576/0x55e0 net/core/dev.c:4424
 dev_queue_xmit include/linux/netdevice.h:3094 [inline]
 __bpf_tx_skb net/core/filter.c:2152 [inline]
 __bpf_redirect_common net/core/filter.c:2196 [inline]
 __bpf_redirect+0x148c/0x1610 net/core/filter.c:2203
 ____bpf_clone_redirect net/core/filter.c:2475 [inline]
 bpf_clone_redirect+0x37e/0x500 net/core/filter.c:2447
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2010
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2253
 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:433
 bpf_prog_test_run_skb+0x182f/0x24d0 net/bpf/test_run.c:1094
 bpf_prog_test_run+0x6b1/0xac0 kernel/bpf/syscall.c:4320
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5735
 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5822 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5822
 x64_sys_call+0x2cce/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4092 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4187
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275
 skb_ensure_writable+0x496/0x520 net/core/skbuff.c:6214
 __bpf_try_make_writable net/core/filter.c:1677 [inline]
 bpf_try_make_writable net/core/filter.c:1683 [inline]
 bpf_try_make_head_writable net/core/filter.c:1691 [inline]
 ____bpf_clone_redirect net/core/filter.c:2469 [inline]
 bpf_clone_redirect+0x1c5/0x500 net/core/filter.c:2447
 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2010
 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2253
 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 bpf_test_run+0x546/0xd20 net/bpf/test_run.c:433
 bpf_prog_test_run_skb+0x182f/0x24d0 net/bpf/test_run.c:1094
 bpf_prog_test_run+0x6b1/0xac0 kernel/bpf/syscall.c:4320
 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5735
 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5822 [inline]
 __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5822
 x64_sys_call+0x2cce/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Bytes 12-17 of 20 are uninitialized
Memory access of size 20 starts at ffff88812112fa48
Data copied to user address 0000000020000ac0

CPU: 0 UID: 0 PID: 5234 Comm: syz-executor312 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         e32cde8d Merge tag 'sched_ext-for-6.12-rc1-fixes-1' of..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=145f2580580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b1fd45f2013d812f
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1516939f980000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: min NUM max NUM pkt NUM

EBUG: min 14 max 14 pkt 1
Warning: Permanently added '10.128.1.180' (ED25519) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
executing program
executing program


Tested on:

commit:         2f87d091 Merge tag 'trace-ringbuffer-v6.12-rc3' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17c52c40580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1229c45f980000

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         6efbea77 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12dd8240580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17bb2f27980000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         6efbea77 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=147caf27980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16d4af27980000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         6efbea77 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11c49830580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14889830580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         6efbea77 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13e6af27980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1332af27980000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [net?] KMSAN: kernel-infoleak in move_addr_to_user (7)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com
Tested-by: syzbot+346474e3bf0b26bd3090@syzkaller.appspotmail.com

Tested on:

commit:         a8cc7432 Merge tag 'mm-hotfixes-stable-2024-11-03-10-5..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1047b630580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c11ea7cf15419ce
dashboard link: https://syzkaller.appspot.com/bug?extid=346474e3bf0b26bd3090
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16068740580000

Note: testing is done by a robot and is best-effort only.