CVE-2023-52659
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-52659
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52659.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2023-52659
- Downstream
- Related
- Published
- 2024-05-17T12:08:36Z
- Modified
- 2025-10-08T16:25:31.680730Z
- Summary
- x86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
x86/mm: Ensure input to pfntokaddr() is treated as a 64-bit type
On 64-bit platforms, the pfntokaddr() macro requires that the input value is 64 bits in order to ensure that valid address bits don't get lost when shifting that input by PAGE_SHIFT to calculate the physical address to provide a virtual address for.
One such example is in pvalidatepages() (used by SEV-SNP guests), where the GFN in the struct used for page-state change requests is a 40-bit bit-field, so attempts to pass this GFN field directly into pfnto_kaddr() ends up causing guest crashes when dealing with addresses above the 1TB range due to the above.
Fix this issue with SEV-SNP guests, as well as any similar cases that might cause issues in current/future code, by using an inline function, instead of a macro, so that the input is implicitly cast to the expected 64-bit input type prior to performing the shift operation.
While it might be argued that the issue is on the caller side, other archs/macros have taken similar approaches to deal with instances like this, such as ARM explicitly casting the input to physaddrt:
e48866647b48 ("ARM: 8396/1: use physaddrt in pfntokaddr()")
A C inline function is even better though.
[ mingo: Refined the changelog some more & added _alwaysinline. ]
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/325956b0173f11e98f90462be4829a8b8b0682ce
- https://git.kernel.org/stable/c/7e1471888a5e6e846e9b4d306e5327db2b58e64e
- https://git.kernel.org/stable/c/814305b5c23cb815ada68d43019f39050472b25f
- https://git.kernel.org/stable/c/8e5647a723c49d73b9f108a8bb38e8c29d3948ea
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
-
Introduced6c3211796326a9d35618b866826ca556c8f008a8Fixed325956b0173f11e98f90462be4829a8b8b0682ce
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6c3211796326a9d35618b866826ca556c8f008a8Fixed7e1471888a5e6e846e9b4d306e5327db2b58e64e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6c3211796326a9d35618b866826ca556c8f008a8Fixed814305b5c23cb815ada68d43019f39050472b25f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6c3211796326a9d35618b866826ca556c8f008a8Fixed8e5647a723c49d73b9f108a8bb38e8c29d3948ea
Affected versions
v6.*
Database specific
{
"vanir_signatures": [
{
"signature_type": "Line",
"deprecated": false,
"signature_version": "v1",
"target": {
"file": "arch/x86/include/asm/page.h"
},
"id": "CVE-2023-52659-38f5d666",
"digest": {
"line_hashes": [
"59985941995915257408870132178654290450",
"57273407679775980394435400285111972143",
"231886507218390425545501352867019768984",
"114529852027247912527269873937600587229"
],
"threshold": 0.9
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@814305b5c23cb815ada68d43019f39050472b25f"
},
{
"signature_type": "Line",
"deprecated": false,
"signature_version": "v1",
"target": {
"file": "arch/x86/include/asm/page.h"
},
"id": "CVE-2023-52659-81aa387e",
"digest": {
"line_hashes": [
"59985941995915257408870132178654290450",
"57273407679775980394435400285111972143",
"231886507218390425545501352867019768984",
"114529852027247912527269873937600587229"
],
"threshold": 0.9
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@8e5647a723c49d73b9f108a8bb38e8c29d3948ea"
},
{
"signature_type": "Line",
"deprecated": false,
"signature_version": "v1",
"target": {
"file": "arch/x86/include/asm/page.h"
},
"id": "CVE-2023-52659-aa9d0911",
"digest": {
"line_hashes": [
"59985941995915257408870132178654290450",
"57273407679775980394435400285111972143",
"231886507218390425545501352867019768984",
"114529852027247912527269873937600587229"
],
"threshold": 0.9
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e1471888a5e6e846e9b4d306e5327db2b58e64e"
}
]
}