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Message-ID: <87h87r391i.fsf@oldenburg2.str.redhat.com> Date: Fri, 12 Jul 2019 11:18:49 +0200 From: Florian Weimer <fweimer@...hat.com> To: musl@...ts.openwall.com Subject: Re: [PATCH] Fix the use of sigaltstack to return to the saved main stack. * Szabolcs Nagy: > the comment does not make sense to me, the check is obviously > not redundant. > > MINSIGSTKSZ is a libc api, has nothing to do with the kernel > > the kernel also defines a MINSIGSZTKSZ but musl is an > abstraction layer higher, the linux limit should not be > observable to users, only the limit defined by musl, > which ensures not only that the kernel can deliver a > signal but also reserves space of any current or future > hackery the c runtime may need to do around signal handling, > so that trivial c language signal handler is guaranteed > to work. Please keep in mind that the kernel stack requirements for delivering a signal vary and tend to increase over time, with newer CPU generations with larger register files. It leads to bugs to pretend this value is constant. Thanks, Florian
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