Commit 86e568e9 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Linus Torvalds
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arm: use STACK_TOP when computing mmap base address

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: default avatarAlexandre Ghiti <>
Acked-by: default avatarKees Cook <>
Reviewed-by: default avatarLuis Chamberlain <>
Cc: Albert Ou <>
Cc: Alexander Viro <>
Cc: Catalin Marinas <>
Cc: Christoph Hellwig <>
Cc: Christoph Hellwig <>
Cc: James Hogan <>
Cc: Palmer Dabbelt <>
Cc: Paul Burton <>
Cc: Ralf Baechle <>
Cc: Russell King <>
Cc: Will Deacon <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent af0f4297
......@@ -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);
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