CVE-2024-44943

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Source
https://cve.org/CVERecord?id=CVE-2024-44943
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44943.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-44943
Downstream
Related
Published
2024-08-28T07:11:49.623Z
Modified
2026-02-22T08:26:20.034252Z
Summary
mm: gup: stop abusing try_grab_folio
Details

In the Linux kernel, the following vulnerability has been resolved:

mm: gup: stop abusing trygrabfolio

A kernel warning was reported when pinning folio in CMA memory when launching SEV virtual machine. The splat looks like:

[ 464.325306] WARNING: CPU: 13 PID: 6734 at mm/gup.c:1313 getuserpages+0x423/0x520 [ 464.325464] CPU: 13 PID: 6734 Comm: qemu-kvm Kdump: loaded Not tainted 6.6.33+ #6 [ 464.325477] RIP: 0010:getuserpages+0x423/0x520 [ 464.325515] Call Trace: [ 464.325520] <TASK> [ 464.325523] ? _getuserpages+0x423/0x520 [ 464.325528] ? _warn+0x81/0x130 [ 464.325536] ? _getuserpages+0x423/0x520 [ 464.325541] ? reportbug+0x171/0x1a0 [ 464.325549] ? handlebug+0x3c/0x70 [ 464.325554] ? excinvalidop+0x17/0x70 [ 464.325558] ? asmexcinvalidop+0x1a/0x20 [ 464.325567] ? _getuserpages+0x423/0x520 [ 464.325575] _guplongtermlocked+0x212/0x7a0 [ 464.325583] internalgetuserpagesfast+0xfb/0x190 [ 464.325590] pinuserpagesfast+0x47/0x60 [ 464.325598] sevpinmemory+0xca/0x170 [kvmamd] [ 464.325616] sevmemencregisterregion+0x81/0x130 [kvm_amd]

Per the analysis done by yangge, when starting the SEV virtual machine, it will call pinuserpagesfast(..., FOLLLONGTERM, ...) to pin the memory. But the page is in CMA area, so fast GUP will fail then fallback to the slow path due to the longterm pinnalbe check in trygrabfolio().

The slow path will try to pin the pages then migrate them out of CMA area. But the slow path also uses trygrabfolio() to pin the page, it will also fail due to the same check then the above warning is triggered.

In addition, the trygrabfolio() is supposed to be used in fast path and it elevates folio refcount by using add ref unless zero. We are guaranteed to have at least one stable reference in slow path, so the simple atomic add could be used. The performance difference should be trivial, but the misuse may be confusing and misleading.

Redefined trygrabfolio() to trygrabfoliofast(), and trygrabpage() to trygrab_folio(), and use them in the proper paths. This solves both the abuse and the kernel warning.

The proper naming makes their usecase more clear and should prevent from abusing in the future.

peterx said:

: The user will see the pin fails, for gpu-slow it further triggers the WARN : right below that failure (as in the original report): : : folio = trygrabfolio(page, pageincrem - 1, : follflags); : if (WARNONONCE(!folio)) { <------------------------ here : /* : * Release the 1st page ref if the : * folio is problematic, fail hard. : */ : gupputfolio(pagefolio(page), 1, : follflags); : ret = -EFAULT; : goto out; : }

[1] https://lore.kernel.org/linux-mm/1719478388-31917-1-git-send-email-yangge1116@126.com/

[shy828301@gmail.com: fix implicit declaration of function trygrabfolio_fast]

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/44xxx/CVE-2024-44943.json",
    "cna_assigner": "Linux"
}
References

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
Introduced
57edfcfd3419b4799353d8cbd6ce49da075cfdbd
Fixed
26273f5f4cf68b29414e403837093408a9c98e1f
Fixed
f442fa6141379a20b48ae3efabee827a3d260787

Affected versions

v6.*
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.5
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.5
v6.6.6
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

vanir_signatures 
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    {
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        "target": {
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            "function": "hugetlb_follow_page_mask"
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    },
    {
        "id": "CVE-2024-44943-554446d7",
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        "target": {
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            "function": "gup_fast_pud_range"
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    {
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        "target": {
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            "function": "gup_hugepd"
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    {
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    {
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        "digest": {
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        "signature_type": "Function",
        "target": {
            "file": "mm/gup.c",
            "function": "get_gate_page"
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    },
    {
        "id": "CVE-2024-44943-b2ea354e",
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        "signature_type": "Function",
        "target": {
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            "function": "try_grab_folio"
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    },
    {
        "id": "CVE-2024-44943-ba140919",
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        "digest": {
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        "target": {
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            "function": "follow_huge_pmd"
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    {
        "id": "CVE-2024-44943-c49c3dca",
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        "digest": {
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        "signature_type": "Function",
        "target": {
            "file": "mm/gup.c",
            "function": "gup_fast_pgd_range"
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    {
        "id": "CVE-2024-44943-caec6df3",
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        "digest": {
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        "target": {
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            "function": "follow_devmap_pmd"
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    {
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        "signature_type": "Function",
        "target": {
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            "function": "__get_user_pages"
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    },
    {
        "id": "CVE-2024-44943-d2f35990",
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        "target": {
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            "function": "gup_fast_p4d_range"
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    {
        "id": "CVE-2024-44943-dca13376",
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        "target": {
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    {
        "id": "CVE-2024-44943-e1007864",
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            "function": "get_gate_page"
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        "signature_type": "Function",
        "target": {
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            "function": "gup_hugepd"
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    {
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        "signature_type": "Function",
        "target": {
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            "function": "try_grab_folio"
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    },
    {
        "id": "CVE-2024-44943-f689cbb4",
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        "target": {
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    {
        "id": "CVE-2024-44943-fd0d2138",
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            "function": "follow_huge_pud"
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]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44943.json"
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Events
Introduced
0dd3ee31125508cd67f7e7172247f05b7fd1753a
Fixed
0c3836482481200ead7b416ca80c68a29cfdaabd

Affected versions

v6.*
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.7
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-44943.json"