Re: [PATCH v4] linux-user: fix getgroups/setgroups allocations

[Michael Tokarev]

09.04.2023 13:53, Michael Tokarev wrote:
> linux-user getgroups(), setgroups(), getgroups32() and setgroups32()
> used alloca() to allocate grouplist arrays, with unchecked gidsetsize
> coming from the "guest".  With NGROUPS_MAX being 65536 (linux, and it
> is common for an application to allocate NGROUPS_MAX for getgroups()),
> this means a typical allocation is half the megabyte on the stack.
> Which just overflows stack, which leads to immediate SIGSEGV in actual
> system getgroups() implementation.

Ping?

Thanks,

/mjt