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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" X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 05AB61C0004 X-Stat-Signature: j9c7r8e8s1f1n761uoptfo7qnc1sttes X-Rspam-User: X-HE-Tag: 1743589204-888711 X-HE-Meta: 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 EVlCI2eI 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > 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.