CVE - CVE-2024-40974

CVE-ID
CVE-2024-40974	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Enforce hcall result buffer validity and size plpar_hcall(), plpar_hcall9(), and related functions expect callers to provide valid result buffers of certain minimum size. Currently this is communicated only through comments in the code and the compiler has no idea. For example, if I write a bug like this: long retbuf[PLPAR_HCALL_BUFSIZE]; // should be PLPAR_HCALL9_BUFSIZE plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, ...); This compiles with no diagnostics emitted, but likely results in stack corruption at runtime when plpar_hcall9() stores results past the end of the array. (To be clear this is a contrived example and I have not found a real instance yet.) To make this class of error less likely, we can use explicitly-sized array parameters instead of pointers in the declarations for the hcall APIs. When compiled with -Warray-bounds[1], the code above now provokes a diagnostic like this: error: array argument is too small; is of size 32, callee requires at least 72 [-Werror,-Warray-bounds] 60 \| plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, \| ^ ~~~~~~ [1] Enabled for LLVM builds but not GCC for now. See commit 0da6e5fd6c37 ("gcc: disable '-Warray-bounds' for gcc-13 too") and related changes.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca URL:https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca MISC:https://git.kernel.org/stable/c/262e942ff5a839b9e4f3302a8987928b0c8b8a2d URL:https://git.kernel.org/stable/c/262e942ff5a839b9e4f3302a8987928b0c8b8a2d MISC:https://git.kernel.org/stable/c/3ad0034910a57aa88ed9976b1431b7b8c84e0048 URL:https://git.kernel.org/stable/c/3ad0034910a57aa88ed9976b1431b7b8c84e0048 MISC:https://git.kernel.org/stable/c/8aa11aa001576bf3b00dcb8559564ad7a3113588 URL:https://git.kernel.org/stable/c/8aa11aa001576bf3b00dcb8559564ad7a3113588 MISC:https://git.kernel.org/stable/c/a8c988d752b3d98d5cc1e3929c519a55ef55426c URL:https://git.kernel.org/stable/c/a8c988d752b3d98d5cc1e3929c519a55ef55426c MISC:https://git.kernel.org/stable/c/aa6107dcc4ce9a3451f2d729204713783b657257 URL:https://git.kernel.org/stable/c/aa6107dcc4ce9a3451f2d729204713783b657257 MISC:https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18 URL:https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18 MISC:https://git.kernel.org/stable/c/ff2e185cf73df480ec69675936c4ee75a445c3e4 URL:https://git.kernel.org/stable/c/ff2e185cf73df480ec69675936c4ee75a445c3e4
Assigning CNA
kernel.org
Date Record Created
20240712	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240712)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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