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Date: Wed, 1 Nov 2017 22:26:37 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: Helge Deller <deller@....de>, Hugh Dickins <hughd@...gle.com>, Oleg Nesterov <oleg@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 112/139] mm: fix overflow check in expand_upwards() From: Helge Deller <deller@....de> commit 37511fb5c91db93d8bd6e3f52f86e5a7ff7cfcdf upstream. Jörn Engel noticed that the expand_upwards() function might not return -ENOMEM in case the requested address is (unsigned long)-PAGE_SIZE and if the architecture didn't defined TASK_SIZE as multiple of PAGE_SIZE. Affected architectures are arm, frv, m68k, blackfin, h8300 and xtensa which all define TASK_SIZE as 0xffffffff, but since none of those have an upwards-growing stack we currently have no actual issue. Nevertheless let's fix this just in case any of the architectures with an upward-growing stack (currently parisc, metag and partly ia64) define TASK_SIZE similar. Link: http://lkml.kernel.org/r/20170702192452.GA11868@p100.box Fixes: bd726c90b6b8 ("Allow stack to grow up to address space limit") Signed-off-by: Helge Deller <deller@....de> Reported-by: Jörn Engel <joern@...estorage.com> Cc: Hugh Dickins <hughd@...gle.com> Cc: Oleg Nesterov <oleg@...hat.com> Cc: <stable@...r.kernel.org> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Willy Tarreau <w@....eu> --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index 3c4e4d7..d042e25 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2132,7 +2132,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) /* Guard against exceeding limits of the address space. */ address &= PAGE_MASK; - if (address >= TASK_SIZE) + if (address >= (TASK_SIZE & PAGE_MASK)) return -ENOMEM; address += PAGE_SIZE; -- 2.8.0.rc2.1.gbe9624a
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