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| author | James Hogan <james.hogan@imgtec.com> | 2014-05-14 00:58:24 +0200 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2014-05-15 01:00:35 +0200 |
| commit | d71f290b4e98a39f49f2595a13be3b4d5ce8e1f1 (patch) | |
| tree | b0547c265b8eb0d828ce47b9f4a20cc969d225e5 /arch/parisc | |
| parent | metag: fix memory barriers (diff) | |
| download | linux-d71f290b4e98a39f49f2595a13be3b4d5ce8e1f1.tar.xz linux-d71f290b4e98a39f49f2595a13be3b4d5ce8e1f1.zip | |
metag: Reduce maximum stack size to 256MB
Specify the maximum stack size for arches where the stack grows upward
(parisc and metag) in asm/processor.h rather than hard coding in
fs/exec.c so that metag can specify a smaller value of 256MB rather than
1GB.
This fixes a BUG on metag if the RLIMIT_STACK hard limit is increased
beyond a safe value by root. E.g. when starting a process after running
"ulimit -H -s unlimited" it will then attempt to use a stack size of the
maximum 1GB which is far too big for metag's limited user virtual
address space (stack_top is usually 0x3ffff000):
BUG: failure at fs/exec.c:589/shift_arg_pages()!
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: linux-parisc@vger.kernel.org
Cc: linux-metag@vger.kernel.org
Cc: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # only needed for >= v3.9 (arch/metag)
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/include/asm/processor.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h index 198a86feb574..86522ef09d52 100644 --- a/arch/parisc/include/asm/processor.h +++ b/arch/parisc/include/asm/processor.h @@ -55,6 +55,8 @@ #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX DEFAULT_TASK_SIZE +#define STACK_SIZE_MAX (1 << 30) /* 1 GB */ + #endif #ifndef __ASSEMBLY__ |