This is a note to let you know that I've just added the patch titled
x86/mm: Make mmap(MAP_32BIT) work correctly
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-mm-make-mmap-map_32bit-work-correctly.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Mar 18 16:55:33 CET 2018
From: Dmitry Safonov <dsafonov@xxxxxxxxxxxxx>
Date: Mon, 6 Mar 2017 17:17:20 +0300
Subject: x86/mm: Make mmap(MAP_32BIT) work correctly
From: Dmitry Safonov <dsafonov@xxxxxxxxxxxxx>
[ Upstream commit 3e6ef9c80946f781fc25e8490c9875b1d2b61158 ]
mmap(MAP_32BIT) is broken due to the dependency on the TIF_ADDR32 thread
flag.
For 64bit applications MAP_32BIT will force legacy bottom-up allocations and
the 1GB address space restriction even if the application issued a compat
syscall, which should not be subject of these restrictions.
For 32bit applications, which issue 64bit syscalls the newly introduced
mmap base separation into 64-bit and compat bases changed the behaviour
because now a 64-bit mapping is returned, but due to the TIF_ADDR32
dependency MAP_32BIT is ignored. Before the separation a 32-bit mapping was
returned, so the MAP_32BIT handling was irrelevant.
Replace the check for TIF_ADDR32 with a check for the compat syscall. That
solves both the 64-bit issuing a compat syscall and the 32-bit issuing a
64-bit syscall problems.
[ tglx: Massaged changelog ]
Signed-off-by: Dmitry Safonov <dsafonov@xxxxxxxxxxxxx>
Cc: 0x7f454c46@xxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170306141721.9188-5-dsafonov@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/sys_x86_64.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -100,7 +100,7 @@ out:
static void find_start_end(unsigned long flags, unsigned long *begin,
unsigned long *end)
{
- if (!test_thread_flag(TIF_ADDR32) && (flags & MAP_32BIT)) {
+ if (!in_compat_syscall() && (flags & MAP_32BIT)) {
/* This is usually used needed to map code in small
model, so it needs to be in the first 31bit. Limit
it to that. This means we need to move the
@@ -175,7 +175,7 @@ arch_get_unmapped_area_topdown(struct fi
return addr;
/* for MAP_32BIT mappings we force the legacy mmap base */
- if (!test_thread_flag(TIF_ADDR32) && (flags & MAP_32BIT))
+ if (!in_compat_syscall() && (flags & MAP_32BIT))
goto bottomup;
/* requesting a specific address */
Patches currently in stable-queue which might be from dsafonov@xxxxxxxxxxxxx are
queue-4.9/x86-mm-make-mmap-map_32bit-work-correctly.patch