Re: Update syscall lists for Linux 5.19

[Aurelien Jarno <aurelien@aurel32.net>]

On 2022-08-03 17:36, Palmer Dabbelt wrote:
> On Tue, 02 Aug 2022 12:23:42 PDT (-0700), joseph@codesourcery.com wrote:
> > Linux 5.19 has no new syscalls, but enables memfd_secret in the uapi
> > headers for RISC-V.  Update the version number in syscall-names.list
> > to reflect that it is still current for 5.19 and regenerate the
> > arch-syscall.h headers with build-many-glibcs.py update-syscalls.
> > 
> > Tested with build-many-glibcs.py.
> > 
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/arch-syscall.h b/sysdeps/unix/sysv/linux/riscv/rv32/arch-syscall.h
> > index bf4be80..202520e 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv32/arch-syscall.h
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv32/arch-syscall.h
> > @@ -122,6 +122,7 @@
> >  #define __NR_mbind 235
> >  #define __NR_membarrier 283
> >  #define __NR_memfd_create 279
> > +#define __NR_memfd_secret 447
> >  #define __NR_migrate_pages 238
> >  #define __NR_mincore 232
> >  #define __NR_mkdirat 34
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h b/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h
> > index d656aed..4e65f33 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h
> > @@ -127,6 +127,7 @@
> >  #define __NR_mbind 235
> >  #define __NR_membarrier 283
> >  #define __NR_memfd_create 279
> > +#define __NR_memfd_secret 447
> >  #define __NR_migrate_pages 238
> >  #define __NR_mincore 232
> >  #define __NR_mkdirat 34
> > diff --git a/sysdeps/unix/sysv/linux/syscall-names.list b/sysdeps/unix/sysv/linux/syscall-names.list
> > index 6c7b2f7..028ad31 100644
> > --- a/sysdeps/unix/sysv/linux/syscall-names.list
> > +++ b/sysdeps/unix/sysv/linux/syscall-names.list
> > @@ -21,8 +21,8 @@
> >  # This file can list all potential system calls.  The names are only
> >  # used if the installed kernel headers also provide them.
> > 
> > -# The list of system calls is current as of Linux 5.18.
> > -kernel 5.18
> > +# The list of system calls is current as of Linux 5.19.
> > +kernel 5.19
> > 
> >  FAST_atomic_update
> >  FAST_cmpxchg
> 
> Thanks, this was just a bug in the uapi headers: the syscall itself was has
> been implemented since 7bb7f2ac24a0 ("arch, mm: wire up memfd_secret system
> call where relevant"), which IIUC was first released in 5.14.  The fix
> should get backported.

It got backported in 5.18.3.

> I don't think any of that matters so much here, though.

The backport causes the misc/tst-glibcsyscalls test to fail on the
stable branches (tested on 2.35, but I guess it's the same on 2.36):

| original exit status 1
| error: kernel syscall 'memfd_secret' (447) not known to glibc
| info: glibc tables are based on kernel version 5.18
| info: installed kernel headers are version 5.18

So I wonder if we should just backport this commit to the stable
branches to fix this failure.

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net