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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	alex@ghiti.fr
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
	linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-mm@kvack.org, akpm@linux-foundation.org,
	catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 02/14] mm: Allow arch specific arch_randomize_brk() with CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
Date: Wed,  9 Mar 2022 18:44:36 +0100	[thread overview]
Message-ID: <4f4d5d96a322e8f34f0c5a1d25f3c5cf409b01d2.1646847561.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1646847561.git.christophe.leroy@csgroup.eu>

Commit e7142bf5d231 ("arm64, mm: make randomization selected by
generic topdown mmap layout") introduced a default version of
arch_randomize_brk() provided when
CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT is selected.

powerpc could select CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
but needs to provide its own arch_randomize_brk().

In order to allow that, define generic version of arch_randomize_brk()
as a __weak symbol.

Cc: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 mm/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/util.c b/mm/util.c
index d3102081add0..8872e734596b 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -344,7 +344,7 @@ unsigned long randomize_stack_top(unsigned long stack_top)
 }
 
 #ifdef CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
-unsigned long arch_randomize_brk(struct mm_struct *mm)
+unsigned long __weak arch_randomize_brk(struct mm_struct *mm)
 {
 	/* Is the current task 32bit ? */
 	if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task())
-- 
2.34.1



  parent reply	other threads:[~2022-03-09 17:45 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-09 17:44 [PATCH v8 00/14] Convert powerpc to default topdown mmap layout (v8) Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 01/14] sizes.h: Add SZ_1T macro Christophe Leroy
2022-03-10 16:52   ` Bjorn Helgaas
2022-03-10 18:09     ` Christophe Leroy
2022-03-10 18:21       ` Bjorn Helgaas
2022-03-09 17:44 ` Christophe Leroy [this message]
2022-03-09 17:44 ` [PATCH v8 03/14] mm, hugetlbfs: Allow an arch to always use generic versions of get_unmapped_area functions Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 04/14] mm: Add len and flags parameters to arch_get_mmap_end() Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 05/14] mm, hugetlbfs: Allow for "high" userspace addresses Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 06/14] powerpc/mm: Move vma_mmu_pagesize() Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 07/14] powerpc/mm: Make slice specific to book3s/64 Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 08/14] powerpc/mm: Remove CONFIG_PPC_MM_SLICES Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 09/14] powerpc/mm: Use generic_get_unmapped_area() and call it from arch_get_unmapped_area() Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 10/14] powerpc/mm: Use generic_hugetlb_get_unmapped_area() Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 11/14] powerpc/mm: Move get_unmapped_area functions to slice.c Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 12/14] powerpc/mm: Enable full randomisation of memory mappings Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 13/14] powerpc/mm: Convert to default topdown mmap layout Christophe Leroy
2022-03-09 17:44 ` [PATCH v8 14/14] powerpc: Simplify and move arch_randomize_brk() Christophe Leroy
2022-03-10  6:51 ` [PATCH v8 00/14] Convert powerpc to default topdown mmap layout (v8) Christophe Leroy
2022-03-11  4:26   ` Michael Ellerman
2022-03-11  4:49     ` Andrew Morton
2022-04-04  5:22       ` Christophe Leroy
2022-04-07 18:30         ` Christophe Leroy
2022-04-08  4:18           ` Michael Ellerman
2022-04-08  4:17       ` Michael Ellerman

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