From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>,
x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Brian Gerst <brgerst@gmail.com>,
David Laight <David.Laight@aculab.com>,
Kees Cook <keescook@chromium.org>
Subject: [patch V2 0/2] x86/ldt: Prevent LDT inheritance on exec()
Date: Fri, 08 Dec 2017 23:32:41 +0100 [thread overview]
Message-ID: <20171208223241.367344665@linutronix.de> (raw)
LDT should not be inherited on exec(), only on fork().
To sanitize that, the LDT initialization for a new process must be split
into parts and the actual duplication moved to arch_dup_mmap() which is
only called on fork(). This requires that arch_dup_mmap() gains a return
value.
Changes vs. V1:
Moved the duplication to arch_dup_mmap() as suggested by Linus.
Thanks,
tglx
---
arch/powerpc/include/asm/mmu_context.h | 5 +++--
arch/x86/kernel/ldt.c | 17 +++++------------
b/arch/um/include/asm/mmu_context.h | 3 ++-
b/arch/unicore32/include/asm/mmu_context.h | 5 +++--
b/arch/x86/include/asm/mmu_context.h | 24 ++++++++++++++++--------
include/asm-generic/mm_hooks.h | 5 +++--
kernel/fork.c | 3 +--
tools/testing/selftests/x86/ldt_gdt.c | 9 +++------
8 files changed, 36 insertions(+), 35 deletions(-)
next reply other threads:[~2017-12-08 22:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-08 22:32 Thomas Gleixner [this message]
2017-12-08 22:32 ` [patch V2 1/2] arch: Allow arch_dup_mmap() to fail Thomas Gleixner
2017-12-08 22:32 ` [patch V2 2/2] x86/ldt: Prevent ldt inheritance on exec Thomas Gleixner
2017-12-09 18:24 ` Thomas Gleixner
2017-12-09 18:28 ` Thomas Gleixner
2017-12-11 12:13 ` Peter Zijlstra
2017-12-12 17:00 ` Thomas Gleixner
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