CVE-2021-47448 (GCVE-0-2021-47448)
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2025-05-04 07:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix possible stall on recvmsg() recvmsg() can enter an infinite loop if the caller provides the MSG_WAITALL, the data present in the receive queue is not sufficient to fulfill the request, and no more data is received by the peer. When the above happens, mptcp_wait_data() will always return with no wait, as the MPTCP_DATA_READY flag checked by such function is set and never cleared in such code path. Leveraging the above syzbot was able to trigger an RCU stall: rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10499 ticks this GP) idle=0af/1/0x4000000000000000 softirq=10678/10678 fqs=1 (t=10500 jiffies g=13089 q=109) rcu: rcu_preempt kthread starved for 10497 jiffies! g13089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28696 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8510 Comm: syz-executor827 Not tainted 5.15.0-rc2-next-20210920-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0xc8/0x180 mm/kasan/generic.c:189 Code: 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 RSP: 0018:ffffc9000cd676c8 EFLAGS: 00000283 RAX: ffffed100e9a110e RBX: ffffed100e9a110f RCX: ffffffff88ea062a RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888074d08870 RBP: ffffed100e9a110e R08: 0000000000000001 R09: ffff888074d08877 R10: ffffed100e9a110e R11: 0000000000000000 R12: ffff888074d08000 R13: ffff888074d08000 R14: ffff888074d08088 R15: ffff888074d08000 FS: 0000555556d8e300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 S: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 0000000068909000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:101 [inline] test_and_clear_bit include/asm-generic/bitops/instrumented-atomic.h:83 [inline] mptcp_release_cb+0x14a/0x210 net/mptcp/protocol.c:3016 release_sock+0xb4/0x1b0 net/core/sock.c:3204 mptcp_wait_data net/mptcp/protocol.c:1770 [inline] mptcp_recvmsg+0xfd1/0x27b0 net/mptcp/protocol.c:2080 inet6_recvmsg+0x11b/0x5e0 net/ipv6/af_inet6.c:659 sock_recvmsg_nosec net/socket.c:944 [inline] ____sys_recvmsg+0x527/0x600 net/socket.c:2626 ___sys_recvmsg+0x127/0x200 net/socket.c:2670 do_recvmmsg+0x24d/0x6d0 net/socket.c:2764 __sys_recvmmsg net/socket.c:2843 [inline] __do_sys_recvmmsg net/socket.c:2866 [inline] __se_sys_recvmmsg net/socket.c:2859 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2859 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc200d2 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8
Version: 7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1a4554e94f0deff9fc1dc5addf93fa579cc29711\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/612f71d7328c14369924384ad2170aae2a6abd92\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.611Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47448\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:36:18.098656Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:16.705Z\"}}], \"cna\": {\"title\": \"mptcp: fix possible stall on recvmsg()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8\", \"lessThan\": \"1a4554e94f0deff9fc1dc5addf93fa579cc29711\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8\", \"lessThan\": \"612f71d7328c14369924384ad2170aae2a6abd92\", \"versionType\": \"git\"}], \"programFiles\": [\"net/mptcp/protocol.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.14.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/mptcp/protocol.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1a4554e94f0deff9fc1dc5addf93fa579cc29711\"}, {\"url\": \"https://git.kernel.org/stable/c/612f71d7328c14369924384ad2170aae2a6abd92\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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) -\u003estate=0x0 -\u003ecpu=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 \u003c48\u003e 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---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.14\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:11:09.740Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47448\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:11:09.740Z\", \"dateReserved\": \"2024-05-21T14:58:30.832Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T06:19:40.141Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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