CVE-2021-47274 (GCVE-0-2021-47274)
Vulnerability from cvelistv5
Published
2024-05-21 14:20
Modified
2025-05-04 07:07
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
tracing: Correct the length check which causes memory corruption
We've suffered from severe kernel crashes due to memory corruption on
our production environment, like,
Call Trace:
[1640542.554277] general protection fault: 0000 [#1] SMP PTI
[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G
[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190
[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286
[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:
0000000006e931bf
[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:
ffff9a45ff004300
[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:
0000000000000000
[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:
ffffffff9a20608d
[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:
696c662f65636976
[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)
knlGS:0000000000000000
[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:
00000000003606e0
[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[1640542.566742] Call Trace:
[1640542.567009] anon_vma_clone+0x5d/0x170
[1640542.567417] __split_vma+0x91/0x1a0
[1640542.567777] do_munmap+0x2c6/0x320
[1640542.568128] vm_munmap+0x54/0x70
[1640542.569990] __x64_sys_munmap+0x22/0x30
[1640542.572005] do_syscall_64+0x5b/0x1b0
[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[1640542.575642] RIP: 0033:0x7f45d6e61e27
James Wang has reproduced it stably on the latest 4.19 LTS.
After some debugging, we finally proved that it's due to ftrace
buffer out-of-bound access using a debug tool as follows:
[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000
[ 86.780806] no_context+0xdf/0x3c0
[ 86.784327] __do_page_fault+0x252/0x470
[ 86.788367] do_page_fault+0x32/0x140
[ 86.792145] page_fault+0x1e/0x30
[ 86.795576] strncpy_from_unsafe+0x66/0xb0
[ 86.799789] fetch_memory_string+0x25/0x40
[ 86.804002] fetch_deref_string+0x51/0x60
[ 86.808134] kprobe_trace_func+0x32d/0x3a0
[ 86.812347] kprobe_dispatcher+0x45/0x50
[ 86.816385] kprobe_ftrace_handler+0x90/0xf0
[ 86.820779] ftrace_ops_assist_func+0xa1/0x140
[ 86.825340] 0xffffffffc00750bf
[ 86.828603] do_sys_open+0x5/0x1f0
[ 86.832124] do_syscall_64+0x5b/0x1b0
[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9
commit b220c049d519 ("tracing: Check length before giving out
the filter buffer") adds length check to protect trace data
overflow introduced in 0fc1b09ff1ff, seems that this fix can't prevent
overflow entirely, the length check should also take the sizeof
entry->array[0] into account, since this array[0] is filled the
length of trace data and occupy addtional space and risk overflow.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 2e584b1a02eeb860e286d39bc408b25ebc5ec844 Version: e46d433754420b4d6513ca389403de88a0910279 Version: 0572fc6a510add9029b113239eaabf4b5bce8ec9 Version: a0997a86f5c0085e183ddee5fb72091d584d3d16 Version: 7c93d8cff582c459350d6f8906eea6e4cd60d959 Version: b220c049d5196dd94d992dd2dc8cba1a5e6123bf Version: b220c049d5196dd94d992dd2dc8cba1a5e6123bf |
||
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009] anon_vma_clone+0x5d/0x170\n[1640542.567417] __split_vma+0x91/0x1a0\n[1640542.567777] do_munmap+0x2c6/0x320\n[1640542.568128] vm_munmap+0x54/0x70\n[1640542.569990] __x64_sys_munmap+0x22/0x30\n[1640542.572005] do_syscall_64+0x5b/0x1b0\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[ 86.780806] no_context+0xdf/0x3c0\n[ 86.784327] __do_page_fault+0x252/0x470\n[ 86.788367] do_page_fault+0x32/0x140\n[ 86.792145] page_fault+0x1e/0x30\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\n[ 86.799789] fetch_memory_string+0x25/0x40\n[ 86.804002] fetch_deref_string+0x51/0x60\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\n[ 86.812347] kprobe_dispatcher+0x45/0x50\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\n[ 86.825340] 0xffffffffc00750bf\n[ 86.828603] do_sys_open+0x5/0x1f0\n[ 86.832124] do_syscall_64+0x5b/0x1b0\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
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"url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
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],
"title": "tracing: Correct the length check which causes memory corruption",
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"dateReserved": "2024-05-21T13:27:52.127Z",
"dateUpdated": "2025-05-04T07:07:41.320Z",
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Trace:\\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\\n0000000006e931bf\\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\\nffff9a45ff004300\\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\\n0000000000000000\\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\\nffffffff9a20608d\\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\\n696c662f65636976\\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\\nknlGS:0000000000000000\\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\\n00000000003606e0\\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\\n0000000000000000\\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\\n0000000000000400\\n[1640542.566742] Call Trace:\\n[1640542.567009] anon_vma_clone+0x5d/0x170\\n[1640542.567417] __split_vma+0x91/0x1a0\\n[1640542.567777] do_munmap+0x2c6/0x320\\n[1640542.568128] vm_munmap+0x54/0x70\\n[1640542.569990] __x64_sys_munmap+0x22/0x30\\n[1640542.572005] do_syscall_64+0x5b/0x1b0\\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\\n\\nJames Wang has reproduced it stably on the latest 4.19 LTS.\\nAfter some debugging, we finally proved that it\u0027s due to ftrace\\nbuffer out-of-bound access using a debug tool as follows:\\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\\n[ 86.780806] no_context+0xdf/0x3c0\\n[ 86.784327] __do_page_fault+0x252/0x470\\n[ 86.788367] do_page_fault+0x32/0x140\\n[ 86.792145] page_fault+0x1e/0x30\\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\\n[ 86.799789] fetch_memory_string+0x25/0x40\\n[ 86.804002] fetch_deref_string+0x51/0x60\\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\\n[ 86.812347] kprobe_dispatcher+0x45/0x50\\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\\n[ 86.825340] 0xffffffffc00750bf\\n[ 86.828603] do_sys_open+0x5/0x1f0\\n[ 86.832124] do_syscall_64+0x5b/0x1b0\\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n\\ncommit b220c049d519 (\\\"tracing: Check length before giving out\\nthe filter buffer\\\") adds length check to protect trace data\\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\\noverflow entirely, the length check should also take the sizeof\\nentry-\u003earray[0] into account, since this array[0] is filled the\\nlength of trace data and occupy addtional space and risk overflow.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:05:05.763Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47274\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:32:07.995Z\", \"dateReserved\": \"2024-05-21T13:27:52.127Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:20:02.694Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
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}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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