cve-2024-42096
Vulnerability from cvelistv5
Published
2024-07-29 17:39
Modified
2024-11-05 09:37
Severity ?
Summary
x86: stop playing stack games in profile_pc()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/093d9603b60093a9aaae942db56107f6432a5dca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/161cef818545ecf980f0e2ebaf8ba7326ce53c2b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16222beb9f8e5ceb0beeb5cbe54bef16df501a92
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/27c3be840911b15a3f24ed623f86153c825b6b29
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d07fea561d64357fb7b3f3751e653bf20306d77
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49c09ca35a5f521d7fa18caf62fdf378f15e8aa4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65ebdde16e7f5da99dbf8a548fb635837d78384e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3b65c8cbc139bfce9541bc81c1bb766e5ba3f68
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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Perdimos el comentario en alg\u00fan momento (creo que cuando se unific\u00f3 el c\u00f3digo de 32 y 64 bits), pero sol\u00eda decir: Supongamos que la funci\u00f3n de bloqueo no tiene marco de pila o tiene una copia de eflags de PUSHF. lo que explica por qu\u00e9 simplemente carga ciegamente una o dos palabras directamente desde el puntero de la pila y luego echa un vistazo m\u00ednimo a los valores para comprobar si podr\u00edan ser eflags o la PC de retorno: Eflags siempre tiene los bits 22 y superiores limpios, a diferencia de las direcciones del kernel, pero Esa suposici\u00f3n b\u00e1sica del dise\u00f1o de la pila supone que no hay ninguna depuraci\u00f3n de bloqueo, etc., que complicar\u00eda el c\u00f3digo y provocar\u00eda un marco de pila. Provoca la infelicidad de KASAN que Syzkaller [1] y otros [2] han informado durante a\u00f1os. Sin ninguna raz\u00f3n pr\u00e1ctica real para esto, simplemente elimine el c\u00f3digo. 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}


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