Mathias Krause c06989da39 x86/vdso: Ensure vdso32_enabled gets set to valid values only ... vdso_enabled can be set to arbitrary integer values via the kernel command line 'vdso32=' parameter or via 'sysctl abi.vsyscall32'. load_vdso32() only maps VDSO if vdso_enabled == 1, but ARCH_DLINFO_IA32 merily checks for vdso_enabled != 0. As a consequence the AT_SYSINFO_EHDR auxiliary vector for the VDSO_ENTRY is emitted with a NULL pointer which causes a segfault when the application tries to use the VDSO. Restrict the valid arguments on the command line and the sysctl to 0 and 1. Fixes: b0b49f2673 ("x86, vdso: Remove compat vdso support") Signed-off-by: Mathias Krause <minipli@googlemail.com> Acked-by: Andy Lutomirski <luto@amacapital.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Cc: Roland McGrath <roland@redhat.com> Link: http://lkml.kernel.org/r/1491424561-7187-1-git-send-email-minipli@googlemail.com Link: http://lkml.kernel.org/r/20170410151723.518412863@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2017-04-10 18:31:41 +02:00
..
vdso32	x86/vdso/32: Assemble sigreturn.S separately	2016-06-14 12:16:06 +02:00
.gitignore
checkundef.sh
Makefile	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-08-02 16:37:12 -04:00
vclock_gettime.c	clocksource: Use a plain u64 instead of cycle_t	2016-12-25 11:04:12 +01:00
vdso2c.c	x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap	2015-12-11 08:56:03 +01:00
vdso2c.h	x86/vdso: Fix building on big endian host	2016-09-30 12:37:40 +02:00
vdso32-setup.c	x86/vdso: Ensure vdso32_enabled gets set to valid values only	2017-04-10 18:31:41 +02:00
vdso-layout.lds.S	x86/vdso: Remove direct HPET access through the vDSO	2016-04-13 10:28:34 +02:00
vdso-note.S
vdso.lds.S
vdsox32.lds.S
vgetcpu.c
vma.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00