Re: [patch 2/3] x86/vdso: Plug race between mapping and ELF header setup

[Andy Lutomirski]

On Mon, Apr 10, 2017 at 8:14 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> The vsyscall32 sysctl can racy against a concurrent fork when it switches
> from disabled to enabled:
>
>     arch_setup_additional_pages()
>         if (vdso32_enabled)
>            --> No mapping
>                                         sysctl.vsysscall32()
>                                           --> vdso32_enabled = true
>     create_elf_tables()
>       ARCH_DLINFO_IA32
>         if (vdso32_enabled) {
>            --> Add VDSO entry with NULL pointer
>
> Make ARCH_DLINFO_IA32 check whether the VDSO mapping has been set up for
> the newly forked process or not.

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>