Le 24/07/2024 à 20:33, Ryan Sullivan a écrit :
[Vous ne recevez pas souvent de courriers de rysulliv@xxxxxxxxxx. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ] Currently, on PowerPC machines, sibling calls in livepatched functions cause the stack to be corrupted and are thus not supported by tools such as kpatch. Below is an example stack frame showing one such currupted stacks: RHEL-7.6: Linux 3.10.0 ppc64le
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This is caused by the toc stub generated on a sibling call:
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This patch restores r2 value to caller's stack, on a sibling call this will uncorrupt the caller's stack and otherwise will be redundant.
Be carefull. On powerpc/32, r2 contains the pointer to current struct. When I first read the subject of the patch I was puzzled.
You should say toc instead of r2, or make it explicit in the title that it is for powerpc/64
Christophe
