| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix possible stall on recvmsg()\n\nrecvmsg() can enter an infinite loop if the caller provides the\nMSG_WAITALL, the data present in the receive queue is not sufficient to\nfulfill the request, and no more data is received by the peer.\n\nWhen the above happens, mptcp_wait_data() will always return with\nno wait, as the MPTCP_DATA_READY flag checked by such function is\nset and never cleared in such code path.\n\nLeveraging the above syzbot was able to trigger an RCU stall:\n\nrcu: INFO: rcu_preempt self-detected stall on CPU\nrcu: 0-...!: (10499 ticks this GP) idle=0af/1/0x4000000000000000 softirq=10678/10678 fqs=1\n (t=10500 jiffies g=13089 q=109)\nrcu: rcu_preempt kthread starved for 10497 jiffies! g13089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1\nrcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.\nrcu: RCU grace-period kthread stack dump:\ntask:rcu_preempt state:R running task stack:28696 pid: 14 ppid: 2 flags:0x00004000\nCall Trace:\n context_switch kernel/sched/core.c:4955 [inline]\n __schedule+0x940/0x26f0 kernel/sched/core.c:6236\n schedule+0xd3/0x270 kernel/sched/core.c:6315\n schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881\n rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955\n rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128\n kthread+0x405/0x4f0 kernel/kthread.c:327\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\nrcu: Stack dump where RCU GP kthread last ran:\nSending NMI from CPU 0 to CPUs 1:\nNMI backtrace for cpu 1\nCPU: 1 PID: 8510 Comm: syz-executor827 Not tainted 5.15.0-rc2-next-20210920-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]\nRIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]\nRIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]\nRIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]\nRIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]\nRIP: 0010:kasan_check_range+0xc8/0x180 mm/kasan/generic.c:189\nCode: 38 00 74 ed 48 8d 50 08 eb 09 48 83 c0 01 48 39 d0 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 <48> 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00\nRSP: 0018:ffffc9000cd676c8 EFLAGS: 00000283\nRAX: ffffed100e9a110e RBX: ffffed100e9a110f RCX: ffffffff88ea062a\nRDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888074d08870\nRBP: ffffed100e9a110e R08: 0000000000000001 R09: ffff888074d08877\nR10: ffffed100e9a110e R11: 0000000000000000 R12: ffff888074d08000\nR13: ffff888074d08000 R14: ffff888074d08088 R15: ffff888074d08000\nFS: 0000555556d8e300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020000180 CR3: 0000000068909000 CR4: 00000000001506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n instrument_atomic_read_write include/linux/instrumented.h:101 [inline]\n test_and_clear_bit include/asm-generic/bitops/instrumented-atomic.h:83 [inline]\n mptcp_release_cb+0x14a/0x210 net/mptcp/protocol.c:3016\n release_sock+0xb4/0x1b0 net/core/sock.c:3204\n mptcp_wait_data net/mptcp/protocol.c:1770 [inline]\n mptcp_recvmsg+0xfd1/0x27b0 net/mptcp/protocol.c:2080\n inet6_recvmsg+0x11b/0x5e0 net/ipv6/af_inet6.c:659\n sock_recvmsg_nosec net/socket.c:944 [inline]\n ____sys_recvmsg+0x527/0x600 net/socket.c:2626\n ___sys_recvmsg+0x127/0x200 net/socket.c:2670\n do_recvmmsg+0x24d/0x6d0 net/socket.c:2764\n __sys_recvmmsg net/socket.c:2843 [inline]\n __do_sys_recvmmsg net/socket.c:2866 [inline]\n __se_sys_recvmmsg net/socket.c:2859 [inline]\n __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2859\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7fc200d2\n---truncated---" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/mptcp/protocol.c" |
| ], |
| "versions": [ |
| { |
| "version": "7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8", |
| "lessThan": "1a4554e94f0deff9fc1dc5addf93fa579cc29711", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8", |
| "lessThan": "612f71d7328c14369924384ad2170aae2a6abd92", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "net/mptcp/protocol.c" |
| ], |
| "versions": [ |
| { |
| "version": "5.6", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "5.6", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.14.14", |
| "lessThanOrEqual": "5.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.6", |
| "versionEndExcluding": "5.14.14" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "5.6", |
| "versionEndExcluding": "5.15" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/1a4554e94f0deff9fc1dc5addf93fa579cc29711" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/612f71d7328c14369924384ad2170aae2a6abd92" |
| } |
| ], |
| "title": "mptcp: fix possible stall on recvmsg()", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-47448", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
