cve-2024-35944
Vulnerability from cvelistv5
Published
2024-05-19 10:10
Modified
2024-08-02 03:21
Severity
Summary
VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()\n\nSyzkaller hit \u0027WARNING in dg_dispatch_as_host\u0027 bug.\n\nmemcpy: detected field-spanning write (size 56) of single field \"\u0026dg_info-\u003emsg\"\nat drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)\n\nWARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237\ndg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237\n\nSome code commentry, based on my understanding:\n\n544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)-\u003epayload_size)\n/// This is 24 + payload_size\n\nmemcpy(\u0026dg_info-\u003emsg, dg, dg_size);\n\tDestination = dg_info-\u003emsg ---\u003e this is a 24 byte\n\t\t\t\t\tstructure(struct vmci_datagram)\n\tSource = dg --\u003e this is a 24 byte structure (struct vmci_datagram)\n\tSize = dg_size = 24 + payload_size\n\n{payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32.\n\n 35 struct delayed_datagram_info {\n 36         struct datagram_entry *entry;\n 37         struct work_struct work;\n 38         bool in_dg_host_queue;\n 39         /* msg and msg_payload must be together. */\n 40         struct vmci_datagram msg;\n 41         u8 msg_payload[];\n 42 };\n\nSo those extra bytes of payload are copied into msg_payload[], a run time\nwarning is seen while fuzzing with Syzkaller.\n\nOne possible way to fix the warning is to split the memcpy() into\ntwo parts -- one -- direct assignment of msg and second taking care of payload.\n\nGustavo quoted:\n\"Under FORTIFY_SOURCE we should not copy data across multiple members\nin a structure.\""
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Una forma posible de solucionar la advertencia es dividir memcpy() en dos partes: una, asignaci\u00f3n directa del mensaje y la segunda, encargada del payload. 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