CVE-2022-48802
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-48802
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48802.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-48802
- Downstream
- Related
- Published
- 2024-07-16T11:43:54Z
- Modified
- 2025-10-13T14:09:45.556491Z
- Summary
- fs/proc: task_mmu.c: don't read mapcount for migration entry
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
fs/proc: task_mmu.c: don't read mapcount for migration entry
The syzbot reported the below BUG:
kernel BUG at include/linux/page-flags.h:785! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4392 Comm: syz-executor560 Not tainted 5.16.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:PageDoubleMap include/linux/page-flags.h:785 [inline] RIP: 0010:_pagemapcount+0x2d2/0x350 mm/util.c:744 Call Trace: pagemapcount include/linux/mm.h:837 [inline] smapsaccount+0x470/0xb10 fs/proc/taskmmu.c:466 smapspteentry fs/proc/taskmmu.c:538 [inline] smapspterange+0x611/0x1250 fs/proc/taskmmu.c:601 walkpmdrange mm/pagewalk.c:128 [inline] walkpudrange mm/pagewalk.c:205 [inline] walkp4drange mm/pagewalk.c:240 [inline] walkpgdrange mm/pagewalk.c:277 [inline] _walkpagerange+0xe23/0x1ea0 mm/pagewalk.c:379 walkpagevma+0x277/0x350 mm/pagewalk.c:530 smapgatherstats.part.0+0x148/0x260 fs/proc/taskmmu.c:768 smapgatherstats fs/proc/taskmmu.c:741 [inline] showsmap+0xc6/0x440 fs/proc/taskmmu.c:822 seqreaditer+0xbb0/0x1240 fs/seqfile.c:272 seqread+0x3e0/0x5b0 fs/seqfile.c:162 vfsread+0x1b5/0x600 fs/readwrite.c:479 ksysread+0x12d/0x250 fs/readwrite.c:619 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x35/0xb0 arch/x86/entry/common.c:80 entrySYSCALL64after_hwframe+0x44/0xae
The reproducer was trying to read /proc/$PID/smaps when calling MADVFREE at the mean time. MADVFREE may split THPs if it is called for partial THP. It may trigger the below race:
CPU A CPU B ----- -----smaps walk: MADVFREE: pagemapcount() PageCompound() splithugepage() page = compound_head(page) PageDoubleMap(page)
When calling PageDoubleMap() this page is not a tail page of THP anymore so the BUG is triggered.
This could be fixed by elevated refcount of the page before calling mapcount, but that would prevent it from counting migration entries, and it seems overkilling because the race just could happen when PMD is split so all PTE entries of tail pages are actually migration entries, and smaps_account() does treat migration entries as mapcount == 1 as Kirill pointed out.
Add a new parameter for smapsaccount() to tell this entry is migration entry then skip calling pagemapcount(). Don't skip getting mapcount for device private entries since they do track references with mapcount.
Pagemap also has the similar issue although it was not reported. Fixed it as well.
[shy828301@gmail.com: v4] [nathan@kernel.org: avoid unused variable warning in pagemappmdrange()]
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/05d3f8045efa59457b323caf00bdb9273b7962fa
- https://git.kernel.org/stable/c/24d7275ce2791829953ed4e72f68277ceb2571c6
- https://git.kernel.org/stable/c/a8dd0cfa37792863b6c4bf9542975212a6715d49
- https://git.kernel.org/stable/c/db3f3636e4aed2cba3e4e7897a053323f7a62249
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede9b61f19858a5d6c42ce2298cf138279375d0d9bFixeddb3f3636e4aed2cba3e4e7897a053323f7a62249
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede9b61f19858a5d6c42ce2298cf138279375d0d9bFixeda8dd0cfa37792863b6c4bf9542975212a6715d49
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede9b61f19858a5d6c42ce2298cf138279375d0d9bFixed05d3f8045efa59457b323caf00bdb9273b7962fa
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede9b61f19858a5d6c42ce2298cf138279375d0d9bFixed24d7275ce2791829953ed4e72f68277ceb2571c6
Affected versions
v4.*
v4.10
v4.10-rc1
v4.10-rc2
v4.10-rc3
v4.10-rc4
v4.10-rc5
v4.10-rc6
v4.10-rc7
v4.10-rc8
v4.11
v4.11-rc1
v4.11-rc2
v4.11-rc3
v4.11-rc4
v4.11-rc5
v4.11-rc6
v4.11-rc7
v4.11-rc8
v4.12
v4.12-rc1
v4.12-rc2
v4.12-rc3
v4.12-rc4
v4.12-rc5
v4.12-rc6
v4.12-rc7
v4.13
v4.13-rc1
v4.13-rc2
v4.13-rc3
v4.13-rc4
v4.13-rc5
v4.13-rc6
v4.13-rc7
v4.14
v4.14-rc1
v4.14-rc2
v4.14-rc3
v4.14-rc4
v4.14-rc5
v4.14-rc6
v4.14-rc7
v4.14-rc8
v4.15
v4.15-rc1
v4.15-rc2
v4.15-rc3
v4.15-rc4
v4.15-rc5
v4.15-rc6
v4.15-rc7
v4.15-rc8
v4.15-rc9
v4.16
v4.16-rc1
v4.16-rc2
v4.16-rc3
v4.16-rc4
v4.16-rc5
v4.16-rc6
v4.16-rc7
v4.17
v4.17-rc1
v4.17-rc2
v4.17-rc3
v4.17-rc4
v4.17-rc5
v4.17-rc6
v4.17-rc7
v4.18
v4.18-rc1
v4.18-rc2
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8
v4.19
v4.19-rc1
v4.19-rc2
v4.19-rc3
v4.19-rc4
v4.19-rc5
v4.19-rc6
v4.19-rc7
v4.19-rc8
v4.20
v4.20-rc1
v4.20-rc2
v4.20-rc3
v4.20-rc4
v4.20-rc5
v4.20-rc6
v4.20-rc7
v4.5
v4.5-rc1
v4.5-rc2
v4.5-rc3
v4.5-rc4
v4.5-rc5
v4.5-rc6
v4.5-rc7
v4.6
v4.6-rc1
v4.6-rc2
v4.6-rc3
v4.6-rc4
v4.6-rc5
v4.6-rc6
v4.6-rc7
v4.7
v4.7-rc1
v4.7-rc2
v4.7-rc3
v4.7-rc4
v4.7-rc5
v4.7-rc6
v4.7-rc7
v4.8
v4.8-rc1
v4.8-rc2
v4.8-rc3
v4.8-rc4
v4.8-rc5
v4.8-rc6
v4.8-rc7
v4.8-rc8
v4.9
v4.9-rc1
v4.9-rc2
v4.9-rc3
v4.9-rc4
v4.9-rc5
v4.9-rc6
v4.9-rc7
v4.9-rc8
v5.*
v5.0
v5.0-rc1
v5.0-rc2
v5.0-rc3
v5.0-rc4
v5.0-rc5
v5.0-rc6
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.10.1
v5.10.10
v5.10.100
v5.10.101
v5.10.11
v5.10.12
v5.10.13
v5.10.14
v5.10.15
v5.10.16
v5.10.17
v5.10.18
v5.10.19
v5.10.2
v5.10.20
v5.10.21
v5.10.22
v5.10.23
v5.10.24
v5.10.25
v5.10.26
v5.10.27
v5.10.28
v5.10.29
v5.10.3
v5.10.30
v5.10.31
v5.10.32
v5.10.33
v5.10.34
v5.10.35
v5.10.36
v5.10.37
v5.10.38
v5.10.39
v5.10.4
v5.10.40
v5.10.41
v5.10.42
v5.10.43
v5.10.44
v5.10.45
v5.10.46
v5.10.47
v5.10.48
v5.10.49
v5.10.5
v5.10.50
v5.10.51
v5.10.52
v5.10.53
v5.10.54
v5.10.55
v5.10.56
v5.10.57
v5.10.58
v5.10.59
v5.10.6
v5.10.60
v5.10.61
v5.10.62
v5.10.63
v5.10.64
v5.10.65
v5.10.66
v5.10.67
v5.10.68
v5.10.69
v5.10.7
v5.10.70
v5.10.71
v5.10.72
v5.10.73
v5.10.74
v5.10.75
v5.10.76
v5.10.77
v5.10.78
v5.10.79
v5.10.8
v5.10.80
v5.10.81
v5.10.82
v5.10.83
v5.10.84
v5.10.85
v5.10.86
v5.10.87
v5.10.88
v5.10.89
v5.10.9
v5.10.90
v5.10.91
v5.10.92
v5.10.93
v5.10.94
v5.10.95
v5.10.96
v5.10.97
v5.10.98
v5.10.99
v5.11
v5.11-rc1
v5.11-rc2
v5.11-rc3
v5.11-rc4
v5.11-rc5
v5.11-rc6
v5.11-rc7
v5.12
v5.12-rc1
v5.12-rc1-dontuse
v5.12-rc2
v5.12-rc3
v5.12-rc4
v5.12-rc5
v5.12-rc6
v5.12-rc7
v5.12-rc8
v5.13
v5.13-rc1
v5.13-rc2
v5.13-rc3
v5.13-rc4
v5.13-rc5
v5.13-rc6
v5.13-rc7
v5.14
v5.14-rc1
v5.14-rc2
v5.14-rc3
v5.14-rc4
v5.14-rc5
v5.14-rc6
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.15.1
v5.15.10
v5.15.11
v5.15.12
v5.15.13
v5.15.14
v5.15.15
v5.15.16
v5.15.17
v5.15.18
v5.15.19
v5.15.2
v5.15.20
v5.15.21
v5.15.22
v5.15.23
v5.15.24
v5.15.3
v5.15.4
v5.15.5
v5.15.6
v5.15.7
v5.15.8
v5.15.9
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.16.1
v5.16.2
v5.16.3
v5.16.4
v5.16.5
v5.16.6
v5.16.7
v5.16.8
v5.16.9
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.2
v5.2-rc1
v5.2-rc2
v5.2-rc3
v5.2-rc4
v5.2-rc5
v5.2-rc6
v5.2-rc7
v5.3
v5.3-rc1
v5.3-rc2
v5.3-rc3
v5.3-rc4
v5.3-rc5
v5.3-rc6
v5.3-rc7
v5.3-rc8
v5.4
v5.4-rc1
v5.4-rc2
v5.4-rc3
v5.4-rc4
v5.4-rc5
v5.4-rc6
v5.4-rc7
v5.4-rc8
v5.5
v5.5-rc1
v5.5-rc2
v5.5-rc3
v5.5-rc4
v5.5-rc5
v5.5-rc6
v5.5-rc7
v5.6
v5.6-rc1
v5.6-rc2
v5.6-rc3
v5.6-rc4
v5.6-rc5
v5.6-rc6
v5.6-rc7
v5.7
v5.7-rc1
v5.7-rc2
v5.7-rc3
v5.7-rc4
v5.7-rc5
v5.7-rc6
v5.7-rc7
v5.8
v5.8-rc1
v5.8-rc2
v5.8-rc3
v5.8-rc4
v5.8-rc5
v5.8-rc6
v5.8-rc7
v5.9
v5.9-rc1
v5.9-rc2
v5.9-rc3
v5.9-rc4
v5.9-rc5
v5.9-rc6
v5.9-rc7
v5.9-rc8
Database specific
{
"vanir_signatures": [
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"signature_version": "v1",
"signature_type": "Function",
"digest": {
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"function_hash": "62427042284755426042725394383711569468"
},
"id": "CVE-2022-48802-03b9b87d",
"target": {
"file": "fs/proc/task_mmu.c",
"function": "smaps_pmd_entry"
},
"deprecated": false,
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@db3f3636e4aed2cba3e4e7897a053323f7a62249"
},
{
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"digest": {
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"function_hash": "316162174337176749685726469197229421941"
},
"id": "CVE-2022-48802-0bf83501",
"target": {
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"function": "smaps_pte_entry"
},
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a8dd0cfa37792863b6c4bf9542975212a6715d49"
},
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"digest": {
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},
"id": "CVE-2022-48802-0fa62fe2",
"target": {
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"function": "pagemap_pmd_range"
},
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@24d7275ce2791829953ed4e72f68277ceb2571c6"
},
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"digest": {
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},
"id": "CVE-2022-48802-2cfeeca4",
"target": {
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"function": "smaps_pte_entry"
},
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@24d7275ce2791829953ed4e72f68277ceb2571c6"
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"digest": {
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},
"id": "CVE-2022-48802-2d8abd03",
"target": {
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},
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"id": "CVE-2022-48802-2e59ff80",
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"function": "smaps_pte_entry"
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@db3f3636e4aed2cba3e4e7897a053323f7a62249"
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},
"id": "CVE-2022-48802-33a177f1",
"target": {
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"function": "pte_to_pagemap_entry"
},
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{
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"threshold": 0.9
},
"id": "CVE-2022-48802-4d69ed49",
"target": {
"file": "fs/proc/task_mmu.c"
},
"deprecated": false,
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@db3f3636e4aed2cba3e4e7897a053323f7a62249"
},
{
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"digest": {
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},
"id": "CVE-2022-48802-5d644f53",
"target": {
"file": "fs/proc/task_mmu.c",
"function": "smaps_account"
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