Huacai Chen 085d695911 MIPS: VDSO: Reduce VDSO_RANDOMIZE_SIZE to 64MB for 64bit ...

[ Upstream commit c61c7def1f ]

Commit ea7e0480a4 ("MIPS: VDSO: Always map near top of user memory")
set VDSO_RANDOMIZE_SIZE to 256MB for 64bit kernel. But take a look at
arch/mips/mm/mmap.c we can see that MIN_GAP is 128MB, which means the
mmap_base may be at (user_address_top - 128MB). This make the stack be
surrounded by mmaped areas, then stack expanding fails and causes a
segmentation fault. Therefore, VDSO_RANDOMIZE_SIZE should be less than
MIN_GAP and this patch reduce it to 64MB.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: ea7e0480a4 ("MIPS: VDSO: Always map near top of user memory")
Patchwork: https://patchwork.linux-mips.org/patch/20910/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Cc: Huacai Chen <chenhuacai@gmail.com>
Cc: stable@vger.kernel.org # 4.19
Signed-off-by: Sasha Levin <sashal@kernel.org>

2018-11-13 11:08:14 -08:00

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alchemy

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ar7

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ath25

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ath79

Merge tag 'mips_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2018-08-13 19:24:32 -07:00

bcm47xx

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bcm63xx

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bmips

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boot

kbuild: rename LDFLAGS to KBUILD_LDFLAGS

2018-08-24 08:22:08 +09:00

cavium-octeon

Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2018-08-15 16:01:47 -07:00

cobalt

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configs

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2018-08-15 15:04:25 -07:00

crypto

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dec

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emma

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fw

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generic

MIPS: Remove obsolete MIPS checks for DST node "chosen@0"

2018-08-06 09:50:33 -07:00

include

MIPS: VDSO: Reduce VDSO_RANDOMIZE_SIZE to 64MB for 64bit

2018-11-13 11:08:14 -08:00

jazz

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jz4740

Merge tag 'mtd/for-4.19' of git://git.infradead.org/linux-mtd

2018-08-14 10:57:44 -07:00

kernel

MIPS: Fix CONFIG_CMDLINE handling

2018-09-28 12:09:04 -07:00

kvm

KVM: Remove obsolete kvm_unmap_hva notifier backend

2018-09-07 15:06:02 +02:00

lantiq

MIPS: lantiq: dma: add dev pointer

2018-09-11 23:33:19 -07:00

lasat

kbuild: rename LDFLAGS to KBUILD_LDFLAGS

2018-08-24 08:22:08 +09:00

lib

MIPS: memset: Fix CPU_DADDI_WORKAROUNDS `small_fixup' regression

2018-10-05 09:41:39 -07:00

loongson32

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loongson64

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math-emu

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mm

Merge tag 'mips_4.19_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2018-08-23 14:23:08 -07:00

mti-malta

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net

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netlogic

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oprofile

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paravirt

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pci

Merge tag 'mips_4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2018-08-13 19:24:32 -07:00

pic32

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pistachio

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pmcs-msp71xx

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pnx833x

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power

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ralink

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rb532

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sgi-ip22

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sgi-ip27

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sgi-ip32

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sibyte

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sni

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tools

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txx9

Merge tag 'mtd/for-4.19' of git://git.infradead.org/linux-mtd

2018-08-14 10:57:44 -07:00

vdso

MIPS: VDSO: Force link endianness

2018-08-07 16:16:13 -07:00

vr41xx

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Kbuild

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Kbuild.platforms

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Kconfig

Merge tag 'mips_4.19_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2018-08-23 14:23:08 -07:00

Kconfig.debug

Kconfig: consolidate the "Kernel hacking" menu

2018-08-02 08:06:48 +09:00

Makefile

kbuild: rename LDFLAGS to KBUILD_LDFLAGS

2018-08-24 08:22:08 +09:00

Makefile.postlink

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