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Fri, 20 Jun 2025 01:49:02 -0700 (PDT) Date: Fri, 20 Jun 2025 01:49:02 -0700 In-Reply-To: <20250620065230.1552640-1-lizhi.xu@windriver.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6855207e.a00a0220.137b3.003b.GAE@google.com> Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3) From: syzbot To: linux-kernel@vger.kernel.org, lizhi.xu@windriver.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl ===================================================== 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:196 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xcc/0x120 lib/usercopy.c:26 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _inline_copy_to_user include/linux/uaccess.h:196 [inline] _copy_to_user+0xcc/0x120 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:439 [inline] vmci_host_unlocked_ioctl+0x1d05/0x5260 drivers/misc/vmw_vmci/vmci_host.c:933 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893 x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: kmemdup_noprof+0xb0/0x100 mm/util.c:139 kmemdup_noprof include/linux/fortify-string.h:765 [inline] dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:272 [inline] vmci_datagram_dispatch+0x4eb/0x1560 drivers/misc/vmw_vmci/vmci_datagram.c:340 ctx_fire_notification drivers/misc/vmw_vmci/vmci_context.c:257 [inline] ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:435 [inline] kref_put include/linux/kref.h:65 [inline] vmci_ctx_put+0x88e/0x15d0 drivers/misc/vmw_vmci/vmci_context.c:497 vmci_ctx_destroy+0x15d/0x250 drivers/misc/vmw_vmci/vmci_context.c:195 vmci_host_do_init_context drivers/misc/vmw_vmci/vmci_host.c:341 [inline] vmci_host_unlocked_ioctl+0x45c1/0x5260 drivers/misc/vmw_vmci/vmci_host.c:929 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893 x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable ev.i.i created at: ctx_fire_notification drivers/misc/vmw_vmci/vmci_context.c:248 [inline] ctx_free_ctx drivers/misc/vmw_vmci/vmci_context.c:435 [inline] kref_put include/linux/kref.h:65 [inline] vmci_ctx_put+0x76b/0x15d0 drivers/misc/vmw_vmci/vmci_context.c:497 vmci_ctx_destroy+0x15d/0x250 drivers/misc/vmw_vmci/vmci_context.c:195 Bytes 28-31 of 40 are uninitialized Memory access of size 40 starts at ffff8880231f26c0 Data copied to user address 000000000000a4bf CPU: 0 UID: 0 PID: 6787 Comm: syz.0.16 Not tainted 6.16.0-rc2-syzkaller-00231-g75f5f23f8787-dirty #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== Tested on: commit: 75f5f23f Merge tag 'block-6.16-20250619' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14a13d0c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=db26f33438d76de9 dashboard link: https://syzkaller.appspot.com/bug?extid=9b9124ae9b12d5af5d95 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 patch: https://syzkaller.appspot.com/x/patch.diff?x=15f39d0c580000