cve-2024-26721
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2024-11-05 09:14
Severity ?
Summary
drm/i915/dsc: Fix the macro that calculates DSCC_/DSCA_ PPS reg address
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/962ac2dce56bb3aad1f82a4bbe3ada57a020287c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff5999fb03f467e1e7159f0ddb199c787f7512b9
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2024-26721",
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/i915/display/intel_vdsc_regs.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/dsc: Fix the macro that calculates DSCC_/DSCA_ PPS reg address\n\nCommit bd077259d0a9 (\"drm/i915/vdsc: Add function to read any PPS\nregister\") defines a new macro to calculate the DSC PPS register\naddresses with PPS number as an input. This macro correctly calculates\nthe addresses till PPS 11 since the addresses increment by 4. So in that\ncase the following macro works correctly to give correct register\naddress:\n\n_MMIO(_DSCA_PPS_0 + (pps) * 4)\n\nHowever after PPS 11, the register address for PPS 12 increments by 12\nbecause of RC Buffer memory allocation in between. Because of this\ndiscontinuity in the address space, the macro calculates wrong addresses\nfor PPS 12 - 16 resulting into incorrect DSC PPS parameter value\nread/writes causing DSC corruption.\n\nThis fixes it by correcting this macro to add the offset of 12 for PPS\n\u003e=12.\n\nv3: Add correct paranthesis for pps argument (Jani Nikula)\n\n(cherry picked from commit 6074be620c31dc2ae11af96a1a5ea95580976fb5)"
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    "cveId": "CVE-2024-26721",
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    "dateReserved": "2024-02-19T14:20:24.162Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26721\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T15:15:54.043\",\"lastModified\":\"2024-04-03T17:24:18.150\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/i915/dsc: Fix the macro that calculates DSCC_/DSCA_ PPS reg address\\n\\nCommit bd077259d0a9 (\\\"drm/i915/vdsc: Add function to read any PPS\\nregister\\\") defines a new macro to calculate the DSC PPS register\\naddresses with PPS number as an input. This macro correctly calculates\\nthe addresses till PPS 11 since the addresses increment by 4. So in that\\ncase the following macro works correctly to give correct register\\naddress:\\n\\n_MMIO(_DSCA_PPS_0 + (pps) * 4)\\n\\nHowever after PPS 11, the register address for PPS 12 increments by 12\\nbecause of RC Buffer memory allocation in between. Because of this\\ndiscontinuity in the address space, the macro calculates wrong addresses\\nfor PPS 12 - 16 resulting into incorrect DSC PPS parameter value\\nread/writes causing DSC corruption.\\n\\nThis fixes it by correcting this macro to add the offset of 12 for PPS\\n\u003e=12.\\n\\nv3: Add correct paranthesis for pps argument (Jani Nikula)\\n\\n(cherry picked from commit 6074be620c31dc2ae11af96a1a5ea95580976fb5)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: drm/i915/dsc: corrige la macro que calcula la direcci\u00f3n de registro DSCC_/DSCA_ PPS Commit bd077259d0a9 (\\\"drm/i915/vdsc: Agregar funci\u00f3n para leer cualquier registro PPS\\\") define un Nueva macro para calcular las direcciones de registro DSC PPS con el n\u00famero PPS como entrada. Esta macro calcula correctamente las direcciones hasta PPS 11 ya que las direcciones se incrementan en 4. Entonces, en ese caso, la siguiente macro funciona correctamente para proporcionar la direcci\u00f3n de registro correcta: _MMIO(_DSCA_PPS_0 + (pps) * 4) Sin embargo, despu\u00e9s de PPS 11, la direcci\u00f3n de registro para PPS 12 se incrementa en 12 debido a la asignaci\u00f3n de memoria del b\u00fafer RC en el medio. Debido a esta discontinuidad en el espacio de direcciones, la macro calcula direcciones incorrectas para PPS 12 - 16, lo que genera lecturas/escrituras incorrectas del valor del par\u00e1metro PPS de DSC, lo que provoca corrupci\u00f3n de DSC. Esto se soluciona corrigiendo esta macro para agregar el desplazamiento de 12 para PPS \u0026gt;=12. v3: agregue par\u00e9ntesis correcto para el argumento pps (Jani Nikula) (seleccionado del commit 6074be620c31dc2ae11af96a1a5ea95580976fb5)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/962ac2dce56bb3aad1f82a4bbe3ada57a020287c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff5999fb03f467e1e7159f0ddb199c787f7512b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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