cve-2024-40974
Vulnerability from cvelistv5
Published
2024-07-12 12:32
Modified
2024-12-19 09:09
Severity ?
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/262e942ff5a839b9e4f3302a8987928b0c8b8a2d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ad0034910a57aa88ed9976b1431b7b8c84e0048
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8aa11aa001576bf3b00dcb8559564ad7a3113588
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8c988d752b3d98d5cc1e3929c519a55ef55426c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa6107dcc4ce9a3451f2d729204713783b657257
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff2e185cf73df480ec69675936c4ee75a445c3e4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19c166ee42cf16d8b156a6cb4544122d9a65d3ca
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/262e942ff5a839b9e4f3302a8987928b0c8b8a2d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3ad0034910a57aa88ed9976b1431b7b8c84e0048
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8aa11aa001576bf3b00dcb8559564ad7a3113588
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a8c988d752b3d98d5cc1e3929c519a55ef55426c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aa6107dcc4ce9a3451f2d729204713783b657257
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/acf2b80c31c37acab040baa3cf5f19fbd5140b18
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff2e185cf73df480ec69675936c4ee75a445c3e4
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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Currently this\\nis communicated only through comments in the code and the compiler has\\nno idea.\\n\\nFor example, if I write a bug like this:\\n\\n  long retbuf[PLPAR_HCALL_BUFSIZE]; // should be PLPAR_HCALL9_BUFSIZE\\n  plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, ...);\\n\\nThis compiles with no diagnostics emitted, but likely results in stack\\ncorruption at runtime when plpar_hcall9() stores results past the end\\nof the array. (To be clear this is a contrived example and I have not\\nfound a real instance yet.)\\n\\nTo make this class of error less likely, we can use explicitly-sized\\narray parameters instead of pointers in the declarations for the hcall\\nAPIs. When compiled with -Warray-bounds[1], the code above now\\nprovokes a diagnostic like this:\\n\\nerror: array argument is too small;\\nis of size 32, callee requires at least 72 [-Werror,-Warray-bounds]\\n   60 |                 plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf,\\n      |                 ^                                   ~~~~~~\\n\\n[1] Enabled for LLVM builds but not GCC for now. See commit\\n    0da6e5fd6c37 (\\\"gcc: disable \u0027-Warray-bounds\u0027 for gcc-13 too\\\") and\\n    related changes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/pseries: aplica la validez y el tama\u00f1o del b\u00fafer de resultados de hcall plpar_hcall(), plpar_hcall9() y las funciones relacionadas esperan que los llamadores proporcionen b\u00faferes de resultados v\u00e1lidos de cierto tama\u00f1o m\u00ednimo. Actualmente esto se comunica s\u00f3lo a trav\u00e9s de comentarios en el c\u00f3digo y el compilador no tiene idea. 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