[PATCH v6 07/14] arm: Use STACK_TOP when computing mmap base address
From: Alexandre Ghiti <alex@ghiti.fr>
Date: 2019-08-08 06:25:50
Also in:
linux-fsdevel, linux-mips, linux-mm, linux-riscv, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
mmap base address must be computed wrt stack top address, using TASK_SIZE is wrong since STACK_TOP and TASK_SIZE are not equivalent. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <redacted> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> --- arch/arm/mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index bff3d00bda5b..0b94b674aa91 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c@@ -19,7 +19,7 @@ /* gap between mmap and stack */ #define MIN_GAP (128*1024*1024UL) -#define MAX_GAP ((TASK_SIZE)/6*5) +#define MAX_GAP ((STACK_TOP)/6*5) #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) static int mmap_is_legacy(struct rlimit *rlim_stack)
@@ -51,7 +51,7 @@ static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack) else if (gap > MAX_GAP) gap = MAX_GAP; - return PAGE_ALIGN(TASK_SIZE - gap - rnd); + return PAGE_ALIGN(STACK_TOP - gap - rnd); } /*
--
2.20.1
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