Thomas Gleixner 6fdc6dd902 x86/vdso: Plug race between mapping and ELF header setup ... 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. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Andy Lutomirski <luto@amacapital.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathias Krause <minipli@googlemail.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20170410151723.602367196@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2017-04-10 18:31:41 +02:00
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asm	x86/vdso: Plug race between mapping and ELF header setup	2017-04-10 18:31:41 +02:00
uapi/asm	x86/boot: Correct setup_header.start_sys name	2017-03-01 11:27:26 +01:00