On November 30, 2018 5:54:18 AM GMT+13:00, Andy Lutomirski <l...@amacapital.net> wrote: > > >> On Nov 29, 2018, at 4:28 AM, Florian Weimer <fwei...@redhat.com> >wrote: >> >> Disclaimer: I'm looking at this patch because Christian requested it. >> I'm not a kernel developer. >> >> * Christian Brauner: >> >>> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl >b/arch/x86/entry/syscalls/syscall_32.tbl >>> index 3cf7b533b3d1..3f27ffd8ae87 100644 >>> --- a/arch/x86/entry/syscalls/syscall_32.tbl >>> +++ b/arch/x86/entry/syscalls/syscall_32.tbl >>> @@ -398,3 +398,4 @@ >>> 384 i386 arch_prctl sys_arch_prctl >__ia32_compat_sys_arch_prctl >>> 385 i386 io_pgetevents sys_io_pgetevents >__ia32_compat_sys_io_pgetevents >>> 386 i386 rseq sys_rseq __ia32_sys_rseq >>> +387 i386 procfd_signal sys_procfd_signal >__ia32_compat_sys_procfd_signal >>> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl >b/arch/x86/entry/syscalls/syscall_64.tbl >>> index f0b1709a5ffb..8a30cde82450 100644 >>> --- a/arch/x86/entry/syscalls/syscall_64.tbl >>> +++ b/arch/x86/entry/syscalls/syscall_64.tbl >>> @@ -343,6 +343,7 @@ >>> 332 common statx __x64_sys_statx >>> 333 common io_pgetevents __x64_sys_io_pgetevents >>> 334 common rseq __x64_sys_rseq >>> +335 64 procfd_signal __x64_sys_procfd_signal >>> >>> # >>> # x32-specific system call numbers start at 512 to avoid cache >impact >>> @@ -386,3 +387,4 @@ >>> 545 x32 execveat __x32_compat_sys_execveat/ptregs >>> 546 x32 preadv2 __x32_compat_sys_preadv64v2 >>> 547 x32 pwritev2 __x32_compat_sys_pwritev64v2 >>> +548 x32 procfd_signal __x32_compat_sys_procfd_signal >> >> Is there a reason why these numbers have to be different? >> >> (See the recent discussion with Andy Lutomirski.) > >Hah, I missed this part of the patch. Let’s not add new x32 syscall >numbers. > >Also, can we perhaps rework this a bit to get rid of the compat entry >point? The easier way would be to check in_compat_syscall(). The nicer >way IMO would be to use the 64-bit structure for 32-bit as well.
Do you have a syscall which set precedence/did this before I could look at? Just if you happen to remember one. Fwiw, I followed the other signal syscalls. They all introduce compat syscalls.
