VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()
In the Linux kernel, the following vulnerability has been resolved: VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host() Syzkaller hit 'WARNING in dg_dispatch_as_host' bug. memcpy: detected field-spanning write (size 56) of single field "&dg_info->msg" at drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24) WARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237 Some code commentry, based on my understanding: 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size) /// This is 24 + payload_size memcpy(&dg_info->msg, dg, dg_size); Destination = dg_info->msg ---> this is a 24 byte structure(struct vmci_datagram) Source = dg --> this is a 24 byte structure (struct vmci_datagram) Size = dg_size = 24 + payload_size {payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32. 35 struct delayed_datagram_info { 36 struct datagram_entry *entry; 37 struct work_struct work; 38 bool in_dg_host_queue; 39 /* msg and msg_payload must be together. */ 40 struct vmci_datagram msg; 41 u8 msg_payload[]; 42 }; So those extra bytes of payload are copied into msg_payload[], a run time warning is seen while fuzzing with Syzkaller. One possible way to fix the warning is to split the memcpy() into two parts -- one -- direct assignment of msg and second taking care of payload. Gustavo quoted: "Under FORTIFY_SOURCE we should not copy data across multiple members in a stru
CVE-2024-35944
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-35944
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "f15eca95138b3d4ec17b63c3c1937b0aa0d3624b",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "130b0cd064874e0d0f58e18fb00e6f3993e90c74",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "feacd430b42bbfa9ab3ed9e4f38b86c43e348c75",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "dae70a57565686f16089737adb8ac64471570f73",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "491a1eb07c2bd8841d63cb5263455e185be5866f",
"versionType": "git"
},
{
"status": "affected",
"version": "a110b7ebb9c674a2b591af2780dd512ad0198d50",
"lessThan": "19b070fefd0d024af3daa7329cbc0d00de5302ec",
"versionType": "git"
}
],
"programFiles": [
"drivers/misc/vmw_vmci/vmci_datagram.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.312",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.274",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.215",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.155",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.86",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.27",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.8.6",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/misc/vmw_vmci/vmci_datagram.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-35944
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26552 · Revision 1
- Added to Heist Feed
- Publisher date