Messages in this thread |  | | Date | Sun, 29 Nov 2020 03:28:23 +0000 | From | Al Viro <> | Subject | Re: [PATCH] x86/signals: Fix save/restore signal stack to correctly support sigset_t |
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On Sat, Nov 28, 2020 at 06:19:31PM -0800, Walt Drummond wrote: > Thanks Al. I want to understand the nuance, so please bear with me as I > reason this out. The cast in stone nature of this is due to both the need > to keep userspace and kernel space in sync (ie, you'd have to coordinate > libc and kernel changes super tightly to pull this off), and any change in > the size of struct rt_sigframe would break backwards compatibility with > older binaries, is that correct?
Pretty much so. I would expect gdb and friends to be very unhappy about that, for starters, along with a bunch of fun stuff like JVM, etc.
Ask the userland folks (libc, gdb, etc.) how would they feel about such changes. I'm fairly sure that it's _not_ going to be a matter of changing _NSIG, rebuilding the kernel and living happily ever after.
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