Messages in this thread | | | Subject | Re: [PATCH v2 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs | From | Stas Sergeev <> | Date | Tue, 29 Dec 2015 15:24:55 +0300 |
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08.12.2015 02:23, Andy Lutomirski пишет: > On Oct 31, 2015 8:25 AM, "Stas Sergeev" <stsp@list.ru> wrote: >> >> 26.10.2015 04:25, Andy Lutomirski пишет: >> >>> These fields have a strange history. This tries to document it. >>> >>> This borrows from 9a036b93a344 ("x86/signal/64: Remove 'fs' and 'gs' >>> from sigcontext"), which was reverted by ed596cde9425 ("Revert x86 >>> sigcontext cleanups"). >>> >>> Signed-off-by: Andy Lutomirski <luto@kernel.org> >> >> Now the strategy about SS is to always save it to the sigcontext. >> This is good because the syscall can clobber it, so the app had >> to be very careful in the past trying to save it by hands. >> How about saving also fs and gs? (without restoring yet) >> If you do, you'll save dosemu a headache of doing any "pre-syscall" >> work. Pre-syscall work is very nasty. >> I haven't checked if the syscall clobber also these or only SS, >> but perhaps saving them by the kernel won't hurt? > > There's a bunch of ongoing work about FS and GS. I want to wait and see. Andy, have you postponed only this, or also the sigreturn patch? Long time no news... sigreturn patch would really be nice to have.
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