Re: [PATCH v5 0/4] linux-user: Fix siginfo_t contents when jumping to non-readable pages

[Ilya Leoshkevich <iii@linux.ibm.com>]

On Wed, 2022-08-17 at 11:23 -0500, Richard Henderson wrote:
> On 8/17/22 10:05, Ilya Leoshkevich wrote:
> > Hi,
> > 
> > I noticed that when we get a SEGV due to jumping to non-readable
> > memory, sometimes si_addr and program counter in siginfo_t are
> > slightly
> > off. I tracked this down to the assumption that translators stop
> > before
> > the end of a page, while in reality they may stop right after it.
> > 
> > Patch 1 fixes an invalidation issue, which may prevent SEGV from
> > happening altogether.
> > Patches 2-3 fix the main issue on x86_64 and s390x. Many other
> > architectures have fixed-size instructions and are not affected.
> > Patch 4 adds tests.
> > 
> > Note: this series depends on [1].
> 
> Hah.  I was just thinking that I should queue your patch set to tcg-
> next-7.2, and then 
> rebase my stuff off of that.  It would ensure that I have your test
> cases in tree so that 
> I don't keep regressing them on you.  :-)
> 
> I'll cherry pick the one patch you're depending on.
> 
> 
> r~

I just checked and cherry-picking [1] and [2] before this series
should be enough.

[1] https://lists.gnu.org/archive/html/qemu-devel/2022-08/msg02462.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2022-08/msg02461.html