From: Kees Cook <keescook@chromium.org>
To: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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>,
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
Subject: Re: [PATCH v4 12/14] mips: Replace arch specific way to determine 32bit task with generic version
Date: Wed, 29 May 2019 13:12:25 -0700 [thread overview]
Message-ID: <201905291312.7B8EBE955@keescook> (raw)
In-Reply-To: <20190526134746.9315-13-alex@ghiti.fr>
On Sun, May 26, 2019 at 09:47:44AM -0400, Alexandre Ghiti wrote:
> Mips uses TASK_IS_32BIT_ADDR to determine if a task is 32bit, but
> this define is mips specific and other arches do not have it: instead,
> use !IS_ENABLED(CONFIG_64BIT) || is_compat_task() condition.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> arch/mips/mm/mmap.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
> index c052565b76fb..900670ea8531 100644
> --- a/arch/mips/mm/mmap.c
> +++ b/arch/mips/mm/mmap.c
> @@ -17,6 +17,7 @@
> #include <linux/sched/signal.h>
> #include <linux/sched/mm.h>
> #include <linux/sizes.h>
> +#include <linux/compat.h>
>
> unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
> EXPORT_SYMBOL(shm_align_mask);
> @@ -191,7 +192,7 @@ static inline unsigned long brk_rnd(void)
>
> rnd = rnd << PAGE_SHIFT;
> /* 32MB for 32bit, 1GB for 64bit */
> - if (TASK_IS_32BIT_ADDR)
> + if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task())
> rnd = rnd & SZ_32M;
> else
> rnd = rnd & SZ_1G;
> --
> 2.20.1
>
--
Kees Cook
next prev parent reply other threads:[~2019-05-29 20:12 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 ` [PATCH v4 11/14] mips: Adjust brk randomization offset to fit generic version Alexandre Ghiti
2019-05-29 20:12 ` 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 [this message]
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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