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ying.huang@linux.alibaba.com, ziy@nvidia.com Subject: Re: [syzbot] [mm?] WARNING in raw_ioctl Message-ID: References: <68fc07a0.a70a0220.3bf6c6.01ab.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <68fc07a0.a70a0220.3bf6c6.01ab.GAE@google.com> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: BAC2240007 X-Stat-Signature: yzdt86enm6xgf3guwbgf8s4tupbqb1sc X-HE-Tag: 1761383815-4262 X-HE-Meta: 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9SUgHkBDK3l8frVSGGjA9M0ytrsZu/FGUcLJc0XpeXD9PfF73nNstRUKA+zng9MmsO2+2Z8DumxOVsKAyHwDePmXPAWjrrePMTVmZriCoyjtu/uNRjMQsz1O5ZApib0f1F1v4wHRFE0RXfuJR0dLIv7oCWcMfEzR5NceNX/EWHqBcsbkSAWFMifCXzF2Aarp5RbOvAJLp/epj8wbw5vznnKT1Q15CtaHKVe81e5vWrksACqnqLUvLrb9KN5cWwhx9ko82bPvDe55HChE1tgumbVm1H/mSTEFaSbQZoGrAvNiAZCCZMl8GiatcfXPWoPiCjtrNCG9FC1a8sb0crWoyjPHVOTSCcbF 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: On Fri, Oct 24, 2025 at 04:11:28PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 72fb0170ef1f Add linux-next specific files for 20251024 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10fd0be2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e812d103f45aa955 > dashboard link: https://syzkaller.appspot.com/bug?extid=d8fd35fa6177afa8c92b > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119eae7c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140693e2580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/be1fa3d1f761/disk-72fb0170.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/57302bf7af40/vmlinux-72fb0170.xz > kernel image: https://storage.googleapis.com/syzbot-assets/91c806bb2a2b/bzImage-72fb0170.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+d8fd35fa6177afa8c92b@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: mm/page_alloc.c:5190 at __alloc_frozen_pages_noprof+0x2c8/0x370 mm/page_alloc.c:5190, CPU#1: syz.0.17/6001 > Modules linked in: > CPU: 1 UID: 0 PID: 6001 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 > RIP: 0010:__alloc_frozen_pages_noprof+0x2c8/0x370 mm/page_alloc.c:5190 > Code: 74 10 4c 89 e7 89 54 24 0c e8 64 b9 0d 00 8b 54 24 0c 49 83 3c 24 00 0f 85 a5 fe ff ff e9 a6 fe ff ff c6 05 b1 7d 70 0d 01 90 <0f> 0b 90 e9 18 ff ff ff a9 00 00 08 00 48 8b 4c 24 10 4c 8d 44 24 > RSP: 0018:ffffc90003017920 EFLAGS: 00010246 > RAX: ffffc90003017900 RBX: 0000000000000013 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003017988 > RBP: ffffc90003017a18 R08: ffffc90003017987 R09: 0000000000000000 > R10: ffffc90003017960 R11: fffff52000602f31 R12: 0000000000000000 > R13: 1ffff92000602f28 R14: 0000000000040cc0 R15: dffffc0000000000 > FS: 000055558dedb500(0000) GS:ffff888125ddc000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffef4504a80 CR3: 0000000072ffa000 CR4: 00000000003526f0 > Call Trace: > > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2418 > ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:5583 > __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5614 > __do_kmalloc_node mm/slub.c:5630 [inline] > __kmalloc_noprof+0x4c9/0x800 mm/slub.c:5654 > kmalloc_noprof include/linux/slab.h:961 [inline] > raw_alloc_io_data drivers/usb/gadget/legacy/raw_gadget.c:673 [inline] > raw_ioctl_ep_read drivers/usb/gadget/legacy/raw_gadget.c:1162 [inline] > raw_ioctl+0x18fb/0x3be0 drivers/usb/gadget/legacy/raw_gadget.c:1325 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fccefd8efc9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffef4505ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fcceffe5fa0 RCX: 00007fccefd8efc9 > RDX: 00002000000000c0 RSI: 00000000c0085508 RDI: 0000000000000004 > RBP: 00007fccefe11f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fcceffe5fa0 R14: 00007fcceffe5fa0 R15: 0000000000000003 > > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > 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: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup Lets first test with KMALLOC_MAX_SIZE as the upper bound for io->length from userspace and then figure out the appropriate upper bound. #syz test diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c index b71680c58de6..7b579a86c145 100644 --- a/drivers/usb/gadget/legacy/raw_gadget.c +++ b/drivers/usb/gadget/legacy/raw_gadget.c @@ -670,6 +670,8 @@ static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr, if (get_from_user) data = memdup_user(ptr + sizeof(*io), io->length); else { + if (io->length > KMALLOC_MAX_SIZE) + return ERR_PTR(-EINVAL); data = kmalloc(io->length, GFP_KERNEL); if (!data) data = ERR_PTR(-ENOMEM);