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<20181206110634.GA9056@localhost.localdomain> In-Reply-To: From: Alexander Potapenko Date: Mon, 14 Jan 2019 10:58:43 +0100 Message-ID: Subject: Re: KMSAN: kernel-infoleak in sctp_getsockopt To: Xin Long Cc: Marcelo Ricardo Leitner , syzbot+ad5d327e6936a2e284be@syzkaller.appspotmail.com, davem , LKML , linux-sctp@vger.kernel.org, network dev , Neil Horman , syzkaller-bugs , Vlad Yasevich Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 14, 2019 at 10:56 AM Xin Long wrote: > > On Mon, Jan 14, 2019 at 5:34 PM Alexander Potapenko w= rote: > > > > On Mon, Dec 10, 2018 at 9:56 AM Xin Long wrote: > > > > > > On Thu, Dec 6, 2018 at 8:08 PM Marcelo Ricardo Leitner > > > wrote: > > > > > > > > On Thu, Dec 06, 2018 at 11:36:08AM +0100, Alexander Potapenko wrote= : > > > > > On Wed, Dec 5, 2018 at 8:31 PM syzbot > > > > > wrote: > > > > > > > > > > > > Hello, > > > > > > > > > > > > syzbot found the following crash on: > > > > > > > > > > > > HEAD commit: fffec98ae2a6 net: proper support for CONFIG_GEN= ERIC_CSUM o.. > > > > > > git tree: https://github.com/google/kmsan.git/master > > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D12e= 84a47400000 > > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D56b= 48b46dafe4516 > > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dad5d3= 27e6936a2e284be > > > > > > compiler: clang version 8.0.0 (trunk 343298) > > > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D1= 03cd225400000 > > > > > > > > > > > > IMPORTANT: if you fix the bug, please add the following tag to = the commit: > > > > > > Reported-by: syzbot+ad5d327e6936a2e284be@syzkaller.appspotmail.= com > > > > > > > > > > > > 8021q: adding VLAN 0 to HW filter on device team0 > > > > > > 8021q: adding VLAN 0 to HW filter on device team0 > > > > > > 8021q: adding VLAN 0 to HW filter on device team0 > > > > > > 8021q: adding VLAN 0 to HW filter on device team0 > > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > > > > BUG: KMSAN: kernel-infoleak in _copy_to_user+0x19a/0x230 lib/us= ercopy.c:33 > > > > > > CPU: 1 PID: 8164 Comm: syz-executor2 Not tainted 4.20.0-rc3+ #9= 5 > > > > > > Hardware name: Google Google Compute Engine/Google Compute Engi= ne, BIOS > > > > > > Google 01/01/2011 > > > > > > Call Trace: > > > > > > __dump_stack lib/dump_stack.c:77 [inline] > > > > > > dump_stack+0x32d/0x480 lib/dump_stack.c:113 > > > > > > kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:683 > > > > > > kmsan_internal_check_memory+0x32a/0xa50 mm/kmsan/kmsan.c:743 > > > > > > kmsan_copy_to_user+0x78/0xd0 mm/kmsan/kmsan_hooks.c:634 > > > > > > _copy_to_user+0x19a/0x230 lib/usercopy.c:33 > > > > > > copy_to_user include/linux/uaccess.h:183 [inline] > > > > > > sctp_getsockopt_local_addrs net/sctp/socket.c:5998 [inline] > > > > > > sctp_getsockopt+0x15248/0x186f0 net/sctp/socket.c:7477 > > > > > > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > > > > > > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > > > > > > __do_sys_getsockopt net/socket.c:1950 [inline] > > > > > > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > > > > > > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > > > > > > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > > > > > > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > > > > > RIP: 0033:0x457569 > > > > > > Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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> 3= d 01 f0 ff > > > > > > ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > > > > > > RSP: 002b:00007f4991886c78 EFLAGS: 00000246 ORIG_RAX: 000000000= 0000037 > > > > > > RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004575= 69 > > > > > > RDX: 000000000000006d RSI: 0000000000000084 RDI: 00000000000000= 03 > > > > > > RBP: 000000000072bf00 R08: 0000000020000140 R09: 00000000000000= 00 > > > > > > R10: 0000000020001100 R11: 0000000000000246 R12: 00007f49918876= d4 > > > > > > R13: 00000000004c7d88 R14: 00000000004ce348 R15: 00000000ffffff= ff > > > > > > > > > > > > Uninit was stored to memory at: > > > > > > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > > > > > > kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] > > > > > > kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 > > > > > > kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:34= 4 > > > > > > kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 > > > > > > __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 > > > > > > sctp_copy_laddrs net/sctp/socket.c:5901 [inline] > > > > > > sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] > > > > > > sctp_getsockopt+0x14f41/0x186f0 net/sctp/socket.c:7477 > > > > > > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > > > > > > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > > > > > > __do_sys_getsockopt net/socket.c:1950 [inline] > > > > > > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > > > > > > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > > > > > > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > > > > > > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > > > > > > > > > > > Uninit was stored to memory at: > > > > > > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > > > > > > kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] > > > > > > kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 > > > > > > kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:34= 4 > > > > > > kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 > > > > > > __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 > > > > > > sctp_copy_laddrs net/sctp/socket.c:5890 [inline] > > > > > > sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] > > > > > > sctp_getsockopt+0x14de8/0x186f0 net/sctp/socket.c:7477 > > > > > > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > > > > > > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > > > > > > __do_sys_getsockopt net/socket.c:1950 [inline] > > > > > > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > > > > > > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > > > > > > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > > > > > > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > > > > > > > > > > > Uninit was created at: > > > > > > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > > > > > > kmsan_internal_poison_shadow+0x6d/0x130 mm/kmsan/kmsan.c:170 > > > > > > kmsan_kmalloc+0xa1/0x100 mm/kmsan/kmsan_hooks.c:186 > > > > > > __kmalloc+0x14c/0x4d0 mm/slub.c:3825 > > > > > > kmalloc include/linux/slab.h:551 [inline] > > > > > > sctp_inet6addr_event+0x60e/0xbd0 net/sctp/ipv6.c:100 > > > > > > notifier_call_chain kernel/notifier.c:93 [inline] > > > > > > __atomic_notifier_call_chain kernel/notifier.c:183 [inline] > > > > > > atomic_notifier_call_chain+0x13d/0x240 kernel/notifier.c:193 > > > > > > inet6addr_notifier_call_chain+0x76/0x90 net/ipv6/addrconf_cor= e.c:107 > > > > > > ipv6_add_addr+0x2597/0x2890 net/ipv6/addrconf.c:1115 > > > > > > inet6_addr_add+0xc86/0x1c10 net/ipv6/addrconf.c:2912 > > > > > > inet6_rtm_newaddr+0x167e/0x3d20 net/ipv6/addrconf.c:4750 > > > > > > rtnetlink_rcv_msg+0x1148/0x1540 net/core/rtnetlink.c:4947 > > > > > > netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2477 > > > > > > rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4965 > > > > > > netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] > > > > > > netlink_unicast+0x1699/0x1740 net/netlink/af_netlink.c:1336 > > > > > > netlink_sendmsg+0x13c7/0x1440 net/netlink/af_netlink.c:1917 > > > > > > sock_sendmsg_nosec net/socket.c:621 [inline] > > > > > > sock_sendmsg net/socket.c:631 [inline] > > > > > > ___sys_sendmsg+0xe3b/0x1240 net/socket.c:2116 > > > > > > __sys_sendmsg net/socket.c:2154 [inline] > > > > > > __do_sys_sendmsg net/socket.c:2163 [inline] > > > > > > __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 > > > > > > __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 > > > > > > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > > > > > > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > > > > > > > > > > > Bytes 32-35 of 2100 are uninitialized > > > > > > Memory access of size 2100 starts at ffff888185d8b000 > > > > > > Data copied to user address 0000000020001108 > > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > > > When a network device goes up and sctp_inetaddr_event() is called= , it > > > > > allocates a partially initialized struct sctp_sockaddr_entry to h= old > > > > > the newly created address. > > > > > The attached reproducer can be then used to read up to 8 uninit b= ytes > > > > > for each of the local addresses. > > > > > I guess the devices aren't created so often that this can pose an= y > > > > > security risk, but we probably still need to allocate this struct= ure > > > > > with __GFP_ZERO. > > > > > > > > Agree. Thanks Alexander. > > > > Looks like this is the last/only place left with this issue. > > Actually there's still a similar bug in IPv4. Memsetting addr->av4 shou= ld help: > seems right, because of __pad of struct sockaddr_in. > Do you have any reproducer for this? I just took the above reproducer. Not sure what changed (perhaps the configuration of my VM), but now the uninitialized data is allocated by sctp_inetaddr_event() > We should use kzalloc for all sctp_sockaddr_entry allocations. > > Thanks. > > > > > diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c > > index d5878ae55840..f1cbfb4d0c39 100644 > > --- a/net/sctp/protocol.c > > +++ b/net/sctp/protocol.c > > @@ -778,6 +778,7 @@ static int sctp_inetaddr_event(struct > > notifier_block *this, unsigned long ev, > > case NETDEV_UP: > > addr =3D kmalloc(sizeof(struct sctp_sockaddr_entry), GF= P_ATOMIC); > > if (addr) { > > + memset(&addr->a.v4, 0, sizeof(struct sockaddr_i= n)); > > addr->a.v4.sin_family =3D AF_INET; > > addr->a.v4.sin_port =3D 0; > > addr->a.v4.sin_addr.s_addr =3D ifa->ifa_local; > > > > > > > This field is not really used by sctp, I will just set it to 0. > > > > > > diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c > > > index fc6c5e4bffa5..7f0539db5604 100644 > > > --- a/net/sctp/ipv6.c > > > +++ b/net/sctp/ipv6.c > > > @@ -101,6 +101,7 @@ static int sctp_inet6addr_event(struct > > > notifier_block *this, unsigned long ev, > > > if (addr) { > > > addr->a.v6.sin6_family =3D AF_INET6; > > > addr->a.v6.sin6_port =3D 0; > > > + addr->a.v6.sin6_flowinfo =3D 0; > > > addr->a.v6.sin6_addr =3D ifa->addr; > > > addr->a.v6.sin6_scope_id =3D ifa->idev->dev->= ifindex; > > > addr->valid =3D 1; > > > > > > > > > > > > > > > > > > > --- > > > > > > This bug 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 bug report. See: > > > > > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicat= e with > > > > > > syzbot. > > > > > > syzbot can test patches for this bug, for details see: > > > > > > https://goo.gl/tpsmEJ#testing-patches > > > > > > > > > > > > -- > > > > > > You received this message because you are subscribed to the Goo= gle Groups "syzkaller-bugs" group. > > > > > > To unsubscribe from this group and stop receiving emails from i= t, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > > > > > > To view this discussion on the web visit https://groups.google.= com/d/msgid/syzkaller-bugs/000000000000311344057c4b6cc3%40google.com. > > > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > > > > > > > > > > > > > > > -- > > > > > Alexander Potapenko > > > > > Software Engineer > > > > > > > > > > Google Germany GmbH > > > > > Erika-Mann-Stra=C3=9Fe, 33 > > > > > 80636 M=C3=BCnchen > > > > > > > > > > Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Halimah DeLaine Prado > > > > > Registergericht und -nummer: Hamburg, HRB 86891 > > > > > Sitz der Gesellschaft: Hamburg > > > > > > > > > #ifndef DUMP_BUF_H > > > > > #define DUMP_BUF_H > > > > > > > > > > #ifndef DUMP_MIN_STRLEN > > > > > #define DUMP_MIN_STRLEN 1 > > > > > #endif > > > > > > > > > > #ifndef DUMP_PARALLEL > > > > > #define DUMP_PARALLEL 0 > > > > > #endif > > > > > > > > > > #ifndef DUMP_PRINT_BUF_ADDR > > > > > #define DUMP_PRINT_BUF_ADDR 0 > > > > > #endif > > > > > > > > > > #ifndef DUMP_PRINT_HEX > > > > > #define DUMP_PRINT_HEX 0 > > > > > #endif > > > > > > > > > > #ifndef DUMP_PRINT_STRING > > > > > #define DUMP_PRINT_STRING 0 > > > > > #endif > > > > > > > > > > #if DUMP_PARALLEL > > > > > pthread_mutex_t out_mutex =3D PTHREAD_MUTEX_INITIALIZER; > > > > > #endif > > > > > > > > > > void dump_buf(unsigned char *buf, int len) { > > > > > int i, nz =3D 0; > > > > > for (i =3D 0; i < len; i++) { > > > > > if (buf[i]) { > > > > > nz =3D 1; > > > > > break; > > > > > } > > > > > } > > > > > if (!nz) { > > > > > // The buffer is empty. > > > > > return; > > > > > } else { > > > > > #if DUMP_PARALLEL > > > > > pthread_mutex_lock(&out_mutex); > > > > > #endif > > > > > #if DUMP_PRINT_BUF_ADDR > > > > > fprintf(stderr, "nonempty buffer at %p\n", buf); > > > > > #endif > > > > > #if DUMP_PRINT_HEX > > > > > for (i=3D0; i < len; i++) { > > > > > if (buf[i]) { > > > > > fprintf(stderr, "buf[%d]: %x (%p)\n", i, buf[i], *(void**= )&buf[i]); > > > > > } > > > > > } > > > > > #endif // DUMP_PRINT_HEX > > > > > #if DUMP_PARALLEL > > > > > pthread_mutex_unlock(&out_mutex); > > > > > #endif > > > > > } > > > > > #if DUMP_PARALLEL > > > > > pthread_mutex_lock(&out_mutex); > > > > > #endif > > > > > #if DUMP_PRINT_STRING > > > > > for (i =3D 0; i < len; i++) { > > > > > if (buf[i]) { > > > > > int str_len =3D strlen(&buf[i]); > > > > > // Short string pieces are too boring. > > > > > if (str_len >=3D DUMP_MIN_STRLEN) { > > > > > unsigned char *c; > > > > > for (c =3D &buf[i]; c < &buf[i + str_len]; c++) { > > > > > if ((*c > 127) || ((*c < 32) && (*c !=3D 10) && (*c != =3D 13))) { > > > > > *c =3D ' '; > > > > > continue; > > > > > } > > > > > } > > > > > // Dump the buffer. > > > > > fprintf(stderr, "%s\n", &buf[i]); > > > > > } > > > > > i +=3D str_len; > > > > > } > > > > > } > > > > > #endif // DUMP_PRINT_STRING > > > > > #if DUMP_PARALLEL > > > > > pthread_mutex_unlock(&out_mutex); > > > > > #endif > > > > > } > > > > > > > > > > #endif > > > > > > > > > #include > > > > > #include > > > > > #include /* See NOTES */ > > > > > #include > > > > > #include > > > > > > > > > > #define DUMP_PARALLEL 1 > > > > > #define DUMP_PRINT_BUF_ADDR 1 > > > > > #define DUMP_PRINT_STRING 1 > > > > > #define DUMP_PRINT_HEX 1 > > > > > #include "dump_buf.h" > > > > > > > > > > void *setsockopt_fn(void *arg) { > > > > > int sock =3D (int)arg; > > > > > struct sockaddr addr; > > > > > memset(&addr, 0, sizeof(addr)); > > > > > addr.sa_family =3D 2; > > > > > addr.sa_data[2] =3D 0xac; > > > > > addr.sa_data[3] =3D 0x14; > > > > > addr.sa_data[4] =3D 0x14; > > > > > setsockopt(sock, 0x84, 0x6e, &addr, 0x10); > > > > > } > > > > > > > > > > #define BUFLEN (0x2c2) > > > > > void *getsockopt_fn(void *arg) { > > > > > int sock =3D (int)arg; > > > > > char buf[BUFLEN]; > > > > > memset(buf, 0, BUFLEN); > > > > > int socklen =3D BUFLEN; > > > > > getsockopt(sock, 0x84, /*SCTP_GET_LOCAL_ADDRS*/0x6d, buf, &sock= len); > > > > > dump_buf(&(buf[8]), 32); > > > > > } > > > > > > > > > > void do_work(int sock) { > > > > > pthread_t t1, t2; > > > > > for (int i =3D 0; i < 10; i++) { > > > > > pthread_create(&t1, NULL, getsockopt_fn, (void*)sock); > > > > > pthread_create(&t2, NULL, setsockopt_fn, (void*)sock); > > > > > usleep(100); > > > > > } > > > > > } > > > > > > > > > > int main(int argc, char *argv[]) { > > > > > int res; > > > > > int pid =3D fork(); > > > > > if (pid =3D=3D 0) { > > > > > int sock =3D socket(0x2, 0x1, 0x84); > > > > > do_work(sock); > > > > > } > > > > > sleep(10); > > > > > return 0; > > > > > } > > > > > > > > > > > > -- > > Alexander Potapenko > > Software Engineer > > > > Google Germany GmbH > > Erika-Mann-Stra=C3=9Fe, 33 > > 80636 M=C3=BCnchen > > > > Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Halimah DeLaine Prado > > Registergericht und -nummer: Hamburg, HRB 86891 > > Sitz der Gesellschaft: Hamburg --=20 Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Stra=C3=9Fe, 33 80636 M=C3=BCnchen Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Halimah DeLaine Prado Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg