APPLIED: [SRU][Xenial][PATCH 0/2] arm64: sigaltstack fails with MINSIGSTKSZ for 32-bit processes (LP: #1844155)

[Juerg Haefliger]

On Mon, 21 Oct 2019 13:30:24 -0400
Khaled Elmously <khalid.elmously at canonical.com> wrote:

> This was missing the "BugLink: " from othe commit msg

Shoot. Sorry about that :-(

...Juerg

 
> 
> On 2019-10-16 10:47:36 , Juerg Haefliger wrote:
> > Applied to xenial/master-next.
> > 
> > ...Juerg
> > 
> >   
> > > [Impact]
> > > 
> > > The arm64 kernel allows one to run aarch32 processes on an aarch64 processor, using the standard 32/64-bit syscall compatibility. However this compat layer does not correctly validate the arguments of the sigaltstack syscall which can result in process failures.
> > > 
> > > [Test Case]
> > > 
> > > The simple reproducer from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904385 triggers a memory allocation error with the current Xenial 4.4 kernel.
> > > 
> > > [Fix]
> > > 
> > > Backport the following two upstream commits:
> > > 24951465cbd2 arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ
> > > 22839869f21a signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack
> > > 
> > > With these two commits, the reproducer no longer fails.
> > > 
> > > [Regression Potential]
> > > 
> > > Low. The modifications are trivial and the two patches have been in upstream for quite a while.
> > > 
> > > Will Deacon (2):
> > >   signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack
> > >   arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ
> > > 
> > >  arch/arm64/include/asm/compat.h |  1 +
> > >  include/linux/compat.h          |  3 +++
> > >  kernel/signal.c                 | 14 +++++++++-----
> > >  3 files changed, 13 insertions(+), 5 deletions(-)
> > >   
> >   
> 
> 
> 
> > -- 
> > kernel-team mailing list
> > kernel-team at lists.ubuntu.com
> > https://lists.ubuntu.com/mailman/listinfo/kernel-team  
> 

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