]> git.baikalelectronics.ru Git - kernel.git/commit
x86/kaslr: Fix the vaddr_end mess
authorThomas Gleixner <tglx@linutronix.de>
Thu, 4 Jan 2018 11:32:03 +0000 (12:32 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 4 Jan 2018 23:39:57 +0000 (00:39 +0100)
commit1dddd25125112ba49706518ac9077a1026a18f37
tree1a7dbf5aabe4314da221e2323ce66c9d2c4e87c1
parentf2078904810373211fb15f91888fba14c01a4acc
x86/kaslr: Fix the vaddr_end mess

vaddr_end for KASLR is only documented in the KASLR code itself and is
adjusted depending on config options. So it's not surprising that a change
of the memory layout causes KASLR to have the wrong vaddr_end. This can map
arbitrary stuff into other areas causing hard to understand problems.

Remove the whole ifdef magic and define the start of the cpu_entry_area to
be the end of the KASLR vaddr range.

Add documentation to that effect.

Fixes: 92a0f81d8957 ("x86/cpu_entry_area: Move it out of the fixmap")
Reported-by: Benjamin Gilbert <benjamin.gilbert@coreos.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Benjamin Gilbert <benjamin.gilbert@coreos.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable <stable@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Garnier <thgarnie@google.com>,
Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801041320360.1771@nanos
Documentation/x86/x86_64/mm.txt
arch/x86/include/asm/pgtable_64_types.h
arch/x86/mm/kaslr.c