From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1A70E235345 for ; Wed, 2 Apr 2025 10:20:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743589206; cv=none; b=kgFuIMK5cGSoGlNlqH5pRsdqRRJTcihKLzPeDA01b3BuqQM3AehwjJi3myL/0vEzKzG06IfWL83JZdh3fgiIrqzVVbPomzYLTV8OEhbcur6Ai4BDWcBnuYKyWE3hIHnTNEAlBE2RPhMy8eqAV4/MOgdM4nBpdFihYj5jRYbN9SU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743589206; c=relaxed/simple; bh=shT9uAPwqJwP5AVhc9ixwKTbjBe8qXi7cKSyCo9pWlw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=Zc3g+o7lewMvaMq39vcxDpo8+c3k5DaUCruKrolyKa2M2NAUuGUe58muS6PvfAdJLtmF65aV+NnUyadQY8P05kUrlWOLMj97nzk5lLCAgYkjUJD1f6Z+lr98WL7DrJAkuJVzk2bDd+ZHnKXcQe8laZ2q77H7wazCT0k8/rlnZ1g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f205.google.com with SMTP id e9e14a558f8ab-3d5d6c997d2so52568145ab.0 for ; Wed, 02 Apr 2025 03:20:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743589204; x=1744194004; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=kMTdeMxo5PWWDHhLUjea7x0ff+WDDWIBIAu/dBGTpkE=; b=KvXpdpnxNhp1so4sAbFTjJfYHNhywD42uxRRjdS0WXF4P0zmcRCVHoEJ4NhFxKamUY euKEH5I95UVxOwdmb3L3eAh0nB+cqu62iTtdXTrVDBSwuHYRWuCea1anhia30O9hgweX T4EvRGq3CiLxWhAPlIxMCEiA58zQ9F+SC+qr8VwQ7y8Mv2aO/nIBPOu4Gb/NgOqPXkH+ ebb2ZJYDaaKF9lPS6b7PcZSKnkY2haXF0DsOHudNrvqgarzGmF3tgkiSpsuw6NaEAR1n xH3KEV1sR2B7F/MzrvB4Vsg3u1SfU5/gIZKyqyFEjLSvcwkEbbzZXtXYSjdibUo1LlQs 2eKQ== X-Forwarded-Encrypted: i=1; AJvYcCUO+0cKH5mY0kgIPBYtoJlBnXdw6WP3HoxpnWdmf6NZ+xqrwsSeVW8GcmC/sPWz+FS+cRaM5jT0uLE+pPU=@vger.kernel.org X-Gm-Message-State: AOJu0Yw4Q+3Gz9AuDlFEfwtnRBp6Abcc4gpbR8QoxK0kKreL1GgyoXRx uhyVkGorXvDlMRtrfDaMp+ngPdDszSzMzpGBgpYwrwrrzWcA3L5zPNLbCYlmleEGMU/+3qOA8cE z+FDwmIKCMzHop6knCHDlVJxqlc6lKrUJtpbew1sFdTkXAz6wdzr0aPw= X-Google-Smtp-Source: AGHT+IEuFmThXr0Sm4QP6dV6iTCzCCX4MkhqfjKY0a//wzzpo5YDRQCmsSl3gusWZ6X/LYQCIC2PNtbPAR2vMUzVOBzK6pPmcdNT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:4401:10b0:3d4:3fbf:967d with SMTP id e9e14a558f8ab-3d5e0908eacmr115850645ab.7.1743589204085; Wed, 02 Apr 2025 03:20:04 -0700 (PDT) Date: Wed, 02 Apr 2025 03:20:04 -0700 In-Reply-To: <5598853a-8f04-4bcc-8e45-984bd8556372@lucifer.local> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67ed0f54.050a0220.297a31.0018.GAE@google.com> Subject: Re: [syzbot] [mm?] general protection fault in sys_mremap From: syzbot To: lorenzo.stoakes@oracle.com Cc: akpm@linux-foundation.org, jannh@google.com, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" > Hi, > > This is already addressed in > https://lore.kernel.org/linux-mm/b2fb6b9c-376d-4e9b-905e-26d847fd3865@lucifer.local/ > this just doesn't exist in -next/upstream yet. > > I _think_ we may be doing a 2nd PR for mm? But if not it'll be fixed in an > early rc. > > To make the point, friendly bot - let's have you try out the fix: > > #syz test: git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-stable "git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/" does not look like a valid git repo address. > > Thanks, Lorenzo > > On Wed, Apr 02, 2025 at 03:01:20AM -0700, syzbot wrote: >> syzbot has found a reproducer for the following issue on: >> >> HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel... >> git tree: upstream >> console+strace: https://syzkaller.appspot.com/x/log.txt?x=16719404580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=24f9c4330e7c0609 >> dashboard link: https://syzkaller.appspot.com/bug?extid=e3385f43b2897a19be24 >> 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=175a4fb0580000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1687b7b0580000 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/e4bfa652b34a/disk-acc4d5ff.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/3d19beb8bb92/vmlinux-acc4d5ff.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/e7298ccc6331/bzImage-acc4d5ff.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+e3385f43b2897a19be24@syzkaller.appspotmail.com >> >> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN PTI >> KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] >> CPU: 0 UID: 0 PID: 5840 Comm: syz-executor163 Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(full) >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 >> RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] >> RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] >> RIP: 0010:expand_vma mm/mremap.c:1621 [inline] >> RIP: 0010:mremap_at mm/mremap.c:1682 [inline] >> RIP: 0010:do_mremap mm/mremap.c:1727 [inline] >> RIP: 0010:__do_sys_mremap mm/mremap.c:1784 [inline] >> RIP: 0010:__se_sys_mremap+0x25fa/0x2c00 mm/mremap.c:1752 >> Code: c0 0f 85 0e 05 00 00 0f b6 9c 24 20 03 00 00 31 ff 89 de e8 d8 0d ab ff 85 db 0f 84 7b 01 00 00 e8 cb 0a ab ff e9 9e 00 00 00 <80> 78 04 00 74 0a bf 20 00 00 00 e8 26 2f 15 00 4c 8b 34 25 20 00 >> RSP: 0018:ffffc900040cfb40 EFLAGS: 00010246 >> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff92000819fca >> RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000 >> RBP: ffffc900040cff00 R08: ffffffff821d1f24 R09: ffffffff8c271397 >> R10: 0000000000000004 R11: ffff888034658000 R12: 0000200000000000 >> R13: ffff888077fac000 R14: 00000000180000fa R15: ffffc900040cfcd0 >> FS: 0000555571cf3380(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00002000000000c0 CR3: 00000000316de000 CR4: 00000000003526f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> >> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >> do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f4480ba0369 >> Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007fff6c642778 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 >> RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f4480ba0369 >> RDX: 0000000000004000 RSI: 0000000000001000 RDI: 0000200000000000 >> RBP: 0000200000001000 R08: 0000200000001000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 >> R13: 00007fff6c642958 R14: 0000000000000001 R15: 0000000000000001 >> >> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] >> RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] >> RIP: 0010:expand_vma mm/mremap.c:1621 [inline] >> RIP: 0010:mremap_at mm/mremap.c:1682 [inline] >> RIP: 0010:do_mremap mm/mremap.c:1727 [inline] >> RIP: 0010:__do_sys_mremap mm/mremap.c:1784 [inline] >> RIP: 0010:__se_sys_mremap+0x25fa/0x2c00 mm/mremap.c:1752 >> Code: c0 0f 85 0e 05 00 00 0f b6 9c 24 20 03 00 00 31 ff 89 de e8 d8 0d ab ff 85 db 0f 84 7b 01 00 00 e8 cb 0a ab ff e9 9e 00 00 00 <80> 78 04 00 74 0a bf 20 00 00 00 e8 26 2f 15 00 4c 8b 34 25 20 00 >> RSP: 0018:ffffc900040cfb40 EFLAGS: 00010246 >> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff92000819fca >> RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000 >> RBP: ffffc900040cff00 R08: ffffffff821d1f24 R09: ffffffff8c271397 >> R10: 0000000000000004 R11: ffff888034658000 R12: 0000200000000000 >> R13: ffff888077fac000 R14: 00000000180000fa R15: ffffc900040cfcd0 >> FS: 0000555571cf3380(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00002000000000c0 CR3: 00000000316de000 CR4: 00000000003526f0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> ---------------- >> Code disassembly (best guess), 1 bytes skipped: >> 0: 0f 85 0e 05 00 00 jne 0x514 >> 6: 0f b6 9c 24 20 03 00 movzbl 0x320(%rsp),%ebx >> d: 00 >> e: 31 ff xor %edi,%edi >> 10: 89 de mov %ebx,%esi >> 12: e8 d8 0d ab ff call 0xffab0def >> 17: 85 db test %ebx,%ebx >> 19: 0f 84 7b 01 00 00 je 0x19a >> 1f: e8 cb 0a ab ff call 0xffab0aef >> 24: e9 9e 00 00 00 jmp 0xc7 >> * 29: 80 78 04 00 cmpb $0x0,0x4(%rax) <-- trapping instruction >> 2d: 74 0a je 0x39 >> 2f: bf 20 00 00 00 mov $0x20,%edi >> 34: e8 26 2f 15 00 call 0x152f5f >> 39: 4c rex.WR >> 3a: 8b .byte 0x8b >> 3b: 34 25 xor $0x25,%al >> 3d: 20 00 and %al,(%rax) >> >> >> --- >> 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.