From: Alexandre Ghiti <alex@ghiti.fr>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>,
Palmer Dabbelt <palmer@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Luis Chamberlain <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, Alexandre Ghiti <alex@ghiti.fr>
Subject: [PATCH v4 11/14] mips: Adjust brk randomization offset to fit generic version
Date: Sun, 26 May 2019 09:47:43 -0400 [thread overview]
Message-ID: <20190526134746.9315-12-alex@ghiti.fr> (raw)
In-Reply-To: <20190526134746.9315-1-alex@ghiti.fr>
This commit simply bumps up to 32MB and 1GB the random offset
of brk, compared to 8MB and 256MB, for 32bit and 64bit respectively.
Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
---
arch/mips/mm/mmap.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index ffbe69f3a7d9..c052565b76fb 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -16,6 +16,7 @@
#include <linux/random.h>
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
+#include <linux/sizes.h>
unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
EXPORT_SYMBOL(shm_align_mask);
@@ -189,11 +190,11 @@ static inline unsigned long brk_rnd(void)
unsigned long rnd = get_random_long();
rnd = rnd << PAGE_SHIFT;
- /* 8MB for 32bit, 256MB for 64bit */
+ /* 32MB for 32bit, 1GB for 64bit */
if (TASK_IS_32BIT_ADDR)
- rnd = rnd & 0x7ffffful;
+ rnd = rnd & SZ_32M;
else
- rnd = rnd & 0xffffffful;
+ rnd = rnd & SZ_1G;
return rnd;
}
--
2.20.1
next prev parent reply other threads:[~2019-05-26 14:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-26 13:47 [PATCH v4 00/14] Provide generic top-down mmap layout functions Alexandre Ghiti
2019-05-26 13:47 ` [PATCH v4 01/14] mm, fs: Move randomize_stack_top from fs to mm Alexandre Ghiti
2019-05-26 13:47 ` [PATCH v4 02/14] arm64: Make use of is_compat_task instead of hardcoding this test Alexandre Ghiti
2019-06-03 17:32 ` Catalin Marinas
2019-05-26 13:47 ` [PATCH v4 03/14] arm64: Consider stack randomization for mmap base only when necessary Alexandre Ghiti
2019-06-03 17:37 ` Catalin Marinas
2019-05-26 13:47 ` [PATCH v4 04/14] arm64, mm: Move generic mmap layout functions to mm Alexandre Ghiti
2019-05-29 20:10 ` Kees Cook
2019-06-03 17:38 ` Catalin Marinas
2019-05-26 13:47 ` [PATCH v4 05/14] arm64, mm: Make randomization selected by generic topdown mmap layout Alexandre Ghiti
2019-05-29 20:10 ` Kees Cook
2019-06-01 9:04 ` Christoph Hellwig
2019-06-03 7:05 ` Alexandre Ghiti
2019-06-03 17:40 ` Catalin Marinas
2019-06-04 6:20 ` Alex Ghiti
2019-05-26 13:47 ` [PATCH v4 06/14] arm: Properly account for stack randomization and stack guard gap Alexandre Ghiti
2019-05-26 13:47 ` [PATCH v4 07/14] arm: Use STACK_TOP when computing mmap base address Alexandre Ghiti
2019-05-26 13:47 ` [PATCH v4 08/14] arm: Use generic mmap top-down layout and brk randomization Alexandre Ghiti
2019-05-29 19:26 ` Kees Cook
2019-05-31 4:49 ` Alex Ghiti
2019-05-26 13:47 ` [PATCH v4 09/14] mips: Properly account for stack randomization and stack guard gap Alexandre Ghiti
2019-05-26 13:47 ` [PATCH v4 10/14] mips: Use STACK_TOP when computing mmap base address Alexandre Ghiti
2019-05-26 13:47 ` Alexandre Ghiti [this message]
2019-05-29 20:12 ` [PATCH v4 11/14] mips: Adjust brk randomization offset to fit generic version Kees Cook
2019-05-26 13:47 ` [PATCH v4 12/14] mips: Replace arch specific way to determine 32bit task with " Alexandre Ghiti
2019-05-29 20:12 ` Kees Cook
2019-05-26 13:47 ` [PATCH v4 13/14] mips: Use generic mmap top-down layout and brk randomization Alexandre Ghiti
2019-05-29 20:12 ` Kees Cook
2019-05-26 13:47 ` [PATCH v4 14/14] riscv: Make mmap allocation top-down by default Alexandre Ghiti
2019-05-29 20:16 ` [PATCH v4 00/14] Provide generic top-down mmap layout functions Kees Cook
2019-05-31 5:04 ` Alex Ghiti
2019-06-13 5:29 ` Alex Ghiti
2019-06-30 15:34 ` Alex Ghiti
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