From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f177.google.com (mail-pf1-f177.google.com [209.85.210.177]) (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 03B9156B8B; Thu, 21 Mar 2024 07:52:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711007561; cv=none; b=ghMDWv0JmU7FIj0ibxvo5TBm3qDIMbsXU+kmrVselAH/cJGI4pEJdk3ntPANZ5ffb/KgAiMcTMlB07PKOQFrguYyvBFP7SUqv89yU3mfXoD4d9+UAHukjn7BkR0UEXNkpXlrOOC+9FvRZbCAWgAHkFJ6fNR1RGDsdxavGWuAP98= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711007561; c=relaxed/simple; bh=ikyLJhFNSfpTPQwmoghzzzs78xD98IsmzrkOBMplNss=; h=MIME-Version:From:Date:Message-ID:Subject:To:Cc:Content-Type; b=QRxtAYJzfqHskZKI+IJHVPKQHMb5ApoPL4pEEafUEwVyDGNecv/aPF8qR2muQDvlZ6xbvGOzyn/lZFBsaAbwLOhHRo/MR8fM4xPHLKHiwqWOlCK/L5nhXjct6hV2Pw11ubzLK+VlhZrMuatyzyVl4s+map0Amf7NYJ336VR7hpk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=jtK8LtCx; arc=none smtp.client-ip=209.85.210.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jtK8LtCx" Received: by mail-pf1-f177.google.com with SMTP id d2e1a72fcca58-6e704078860so575806b3a.0; Thu, 21 Mar 2024 00:52:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711007559; x=1711612359; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=rgEl/WsFIni8VjXWeady1tpoD9wZSmpZIdYRdj57m+E=; b=jtK8LtCxqm8HJRBMVYBmahobM3cl0Ze4alHokCepEsJRwFWWZsAjJ9Iuy4Vo1+07Qx jgnAgmLFcFhMYF1vbHJ+M8XjwKoMPVP1baBIQgMgc8CTIqxlNwr5N5CXbhptc3ds0vs0 tsZ7M+mdThUQBM41nNRxL4tkpe9rWHomhyPZGj9Lc/GIm7bmFQY0XoV7jguicBa0rsxg dIVZ18ijUYd3obdcVgrsBeiw0BxzT/v4JqwovDOolg2/pd4/Yx68NraA/CrkG2dtwnWH WXms1SJ8+FCXn9duDhJZG2Csxqsw0MUP9LhhoFk+vVZ8uoiW8DHe9Fu6QEXbXpeSulYZ LYBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711007559; x=1711612359; h=content-transfer-encoding:cc:to:subject:message-id:date:from :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rgEl/WsFIni8VjXWeady1tpoD9wZSmpZIdYRdj57m+E=; b=YduxjagYAa3hFiFmzz6moWv5WeVYOI5ZOTMRp2uoaegonrwB+3ZNIwJPRu24eLSRgB TO26s8E2gLKVdPpzIAzR2LA941KeJW1QGiki2O5DurzLgE+Hs7JdaLNN0rofsGvSSgAh TD6E2IqIferTmlKvoxUxsLY8anjCG6kK3L1WdHK0eBub6Rz5GC3oV8kfZr70iNAisdHP kCkD8PC47Q1DD/3t39kGrQNP29zqp7G4BXRadmZLL453QY/eYNvS1k1DJ6YRylfu1MfI Vm/wi1lvFoAEiNW5JxgfoDFhMfHEx3f3GdhT5ZKhtBQqW/UdrE4hj5229HfcgPLyKZQW VV2Q== X-Gm-Message-State: AOJu0YwJ8hISN5VYOPhVk2m0hhpU3Gce0kM/KNZSTHqZpbnJUP8pi/6s 8UI3STJkWwHxEUCRul9pa7mD/NtfyqJi+gS2QkOFZrzSp1UOdfRoAueuoWkLaYNMFZ8gYbkjBMH aAO0s7Nktbc0kfnv+lJOdz233tpx6vXRFS88qlw== X-Google-Smtp-Source: AGHT+IF/e5/abMI/HQIGf4yjarIFARE1eh8E6vikXCABiZ3vlA0RFcc6/93a68CZXfefysRSzffMskQLW5HRTMbABiU= X-Received: by 2002:a17:90a:f697:b0:29c:75c6:450c with SMTP id cl23-20020a17090af69700b0029c75c6450cmr16386925pjb.49.1711007558563; Thu, 21 Mar 2024 00:52:38 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: xingwei lee Date: Thu, 21 Mar 2024 15:52:27 +0800 Message-ID: Subject: BUG: unable to handle kernel paging request in fuse_copy_do To: linux-fsdevel@vger.kernel.org, miklos@szeredi.hu Cc: linux-kernel@vger.kernel.org, samsun1006219@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello I found a bug titled "BUG: unable to handle kernel paging request in fuse_copy_do=E2=80=9D with modified syzkaller, and maybe it is related to fs/fuse. I also confirmed in the latest upstream. If you fix this issue, please add the following tag to the commit: Reported-by: xingwei lee Reported-by: yue sun kernel: upstream 23956900041d968f9ad0f30db6dede4daccd7aa9 kernel config: https://syzkaller.appspot.com/text?tag=3DKernelConfig&x=3D9f= 47e8dfa53b0b11 with KASAN enabled compiler: gcc (Debian 12.2.0-14) 12.2.0 BUG: unable to handle kernel paging request in fuse_copy_do UDPLite: UDP-Lite is deprecated and scheduled to be removed in 2025, please contact the netdev mailing list BUG: unable to handle page fault for address: ffff88802c29c000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 13001067 P4D 13001067 PUD 13002067 PMD 24c8d063 PTE 800fffffd3d63060 Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 PID: 8221 Comm: 1e9 Not tainted 6.8.0-05202-g9187210eee7d-dirty #21 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38 Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f80 RSP: 0018:ffffc9001065f9c8 EFLAGS: 00010246 RAX: ffffc9001065fb10 RBX: ffffc9001065fc78 RCX: 0000000000000010 RDX: 0000000000000010 RSI: ffff88802c29c000 RDI: ffffc9001065fb10 RBP: 0000000000000010 R08: ffff88802c29c000 R09: 0000000000000001 R10: ffffffff8ea82ed7 R11: ffffc9001065fd98 R12: ffffc9001065fac0 R13: 0000000000000010 R14: ffffc9001065faf0 R15: ffffc9001065fcbc FS: 000000000f82d480(0000) GS:ffff88823bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88802c29c000 CR3: 000000002dd7c000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: fuse_copy_do+0x152/0x340 fs/fuse/dev.c:758 fuse_copy_one fs/fuse/dev.c:1007 [inline] fuse_dev_do_write+0x1df/0x26a0 fs/fuse/dev.c:1863 fuse_dev_write+0x129/0x1b0 fs/fuse/dev.c:1960 call_write_iter include/linux/fs.h:2108 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x62e/0x10a0 fs/read_write.c:590 ksys_write+0xf6/0x1d0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x7c/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6c/0x74 =3D* repro.c =3D* #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef __NR_memfd_secret #define __NR_memfd_secret 447 #endif static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) !=3D 0) { exit(sig); } uintptr_t addr =3D (uintptr_t)info->si_addr; const uintptr_t prog_start =3D 1 << 20; const uintptr_t prog_end =3D 100 << 20; int skip =3D __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) !=3D 0; int valid =3D addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler =3D SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction =3D segv_handler; sa.sa_flags =3D SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok =3D 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) =3D=3D 0) { \ __VA_ARGS__; \ } else \ ok =3D 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] =3D 0; int len =3D strlen(buf); int fd =3D open(file, O_WRONLY | O_CLOEXEC); if (fd =3D=3D -1) return false; if (write(fd, buf, len) !=3D len) { int err =3D errno; close(fd); errno =3D err; return false; } close(fd); return true; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i =3D 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) =3D=3D pid) return; usleep(1000); } DIR* dir =3D opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent =3D readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") =3D=3D 0 || strcmp(ent->d_name, "..") =3D= =3D 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd =3D open(abort, O_WRONLY); if (fd =3D=3D -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) !=3D pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter =3D 0; for (;; iter++) { int pid =3D fork(); if (pid < 0) exit(1); if (pid =3D=3D 0) { setup_test(); execute_one(); exit(0); } int status =3D 0; uint64_t start =3D current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) =3D=3D pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[3] =3D {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffff= ff}; void execute_one(void) { intptr_t res =3D 0; NONFAILING(memcpy((void*)0x20002040, "./file0\000", 8)); syscall(__NR_mkdirat, /*fd=3D*/0xffffff9c, /*path=3D*/0x20002040ul, /*mode= =3D*/0ul); NONFAILING(memcpy((void*)0x20002080, "/dev/fuse\000", 10)); res =3D syscall(__NR_openat, /*fd=3D*/0xffffffffffffff9cul, /*file=3D*/0x2= 0002080ul, /*flags=3D*/2ul, /*mode=3D*/0ul); if (res !=3D -1) r[0] =3D res; NONFAILING(memcpy((void*)0x200020c0, "./file0\000", 8)); NONFAILING(memcpy((void*)0x20002100, "fuse\000", 5)); NONFAILING(memcpy((void*)0x20002140, "fd", 2)); NONFAILING(*(uint8_t*)0x20002142 =3D 0x3d); NONFAILING(sprintf((char*)0x20002143, "0x%016llx", (long long)r[0])); NONFAILING(*(uint8_t*)0x20002155 =3D 0x2c); NONFAILING(memcpy((void*)0x20002156, "rootmode", 8)); NONFAILING(*(uint8_t*)0x2000215e =3D 0x3d); NONFAILING(sprintf((char*)0x2000215f, "%023llo", (long long)0x4000)); NONFAILING(*(uint8_t*)0x20002176 =3D 0x2c); NONFAILING(memcpy((void*)0x20002177, "user_id", 7)); NONFAILING(*(uint8_t*)0x2000217e =3D 0x3d); NONFAILING(sprintf((char*)0x2000217f, "%020llu", (long long)0)); NONFAILING(*(uint8_t*)0x20002193 =3D 0x2c); NONFAILING(memcpy((void*)0x20002194, "group_id", 8)); NONFAILING(*(uint8_t*)0x2000219c =3D 0x3d); NONFAILING(sprintf((char*)0x2000219d, "%020llu", (long long)0)); NONFAILING(*(uint8_t*)0x200021b1 =3D 0x2c); NONFAILING(*(uint8_t*)0x200021b2 =3D 0); syscall(__NR_mount, /*src=3D*/0ul, /*dst=3D*/0x200020c0ul, /*type=3D*/0x20= 002100ul, /*flags=3D*/0ul, /*opts=3D*/0x20002140ul); res =3D syscall(__NR_memfd_secret, /*flags=3D*/0ul); if (res !=3D -1) r[1] =3D res; syscall(__NR_mmap, /*addr=3D*/0x20000000ul, /*len=3D*/0xb36000ul, /*prot=3DPROT_GROWSUP|PROT_READ*/ 0x2000001ul, /*flags=3DMAP_STACK|MAP_POPULATE|MAP_FIXED|MAP_SHARED*/ 0x28011ul, /*fd=3D*/r[1], /*offset=3D*/0ul); syscall(__NR_ftruncate, /*fd=3D*/r[1], /*len=3D*/7ul); res =3D syscall(__NR_socket, /*domain=3D*/2ul, /*type=3D*/2ul, /*proto=3D*= /0x88); if (res !=3D -1) r[2] =3D res; NONFAILING(*(uint32_t*)0x20000280 =3D 0); syscall(__NR_getsockopt, /*fd=3D*/r[2], /*level=3D*/1, /*optname=3D*/0x11, /*optval=3D*/0ul, /*optlen=3D*/0x20000280ul); NONFAILING(*(uint32_t*)0x20000000 =3D 0x50); NONFAILING(*(uint32_t*)0x20000004 =3D 0); NONFAILING(*(uint64_t*)0x20000008 =3D 0); NONFAILING(*(uint32_t*)0x20000010 =3D 7); NONFAILING(*(uint32_t*)0x20000014 =3D 0x27); NONFAILING(*(uint32_t*)0x20000018 =3D 0); NONFAILING(*(uint32_t*)0x2000001c =3D 0); NONFAILING(*(uint16_t*)0x20000020 =3D 0); NONFAILING(*(uint16_t*)0x20000022 =3D 0); NONFAILING(*(uint32_t*)0x20000024 =3D 0); NONFAILING(*(uint32_t*)0x20000028 =3D 0); NONFAILING(*(uint16_t*)0x2000002c =3D 0); NONFAILING(*(uint16_t*)0x2000002e =3D 0); NONFAILING(memset((void*)0x20000030, 0, 32)); syscall(__NR_write, /*fd=3D*/r[0], /*arg=3D*/0x20000000ul, /*len=3D*/0x50u= l); } int main(void) { syscall(__NR_mmap, /*addr=3D*/0x1ffff000ul, /*len=3D*/0x1000ul, /*prot=3D*= /0ul, /*flags=3DMAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=3D*/-= 1, /*offset=3D*/0ul); syscall(__NR_mmap, /*addr=3D*/0x20000000ul, /*len=3D*/0x1000000ul, /*prot=3DPROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=3DMAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=3D*/-= 1, /*offset=3D*/0ul); syscall(__NR_mmap, /*addr=3D*/0x21000000ul, /*len=3D*/0x1000ul, /*prot=3D*= /0ul, /*flags=3DMAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=3D*/-= 1, /*offset=3D*/0ul); install_segv_handler(); loop(); return 0; } =3D* repro.txt =3D* mkdirat(0xffffffffffffff9c, &(0x7f0000002040)=3D'./file0\x00', 0x0) r0 =3D openat$fuse(0xffffffffffffff9c, &(0x7f0000002080), 0x2, 0x0) mount$fuse(0x0, &(0x7f00000020c0)=3D'./file0\x00', &(0x7f0000002100), 0x0, &(0x7f0000002140)=3D{{'fd', 0x3d, r0}, 0x2c, {'rootmode', 0x3d, 0x4000}}) r1 =3D memfd_secret(0x0) mmap(&(0x7f0000000000/0xb36000)=3Dnil, 0xb36000, 0x2000001, 0x28011, r1, 0x= 0) ftruncate(r1, 0x7) r2 =3D socket$inet_udplite(0x2, 0x2, 0x88) getsockopt$sock_cred(r2, 0x1, 0x11, 0x0, &(0x7f0000000280)) write$FUSE_INIT(r0, &(0x7f0000000000)=3D{0x50}, 0x50) see aslo https://gist.github.com/xrivendell7/961be96ae091c9671bb56efea902ce= c4. I hope it helps. best regards. xingwei Lee