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authorJames Hogan <james.hogan@imgtec.com>2014-05-13 23:58:24 +0100
committerJames Hogan <james.hogan@imgtec.com>2014-05-15 00:00:35 +0100
commitd71f290b4e98a39f49f2595a13be3b4d5ce8e1f1 (patch)
treeb0547c265b8eb0d828ce47b9f4a20cc969d225e5 /arch
parent2425ce84026c385b73ae72039f90d042d49e0394 (diff)
downloadlinux-d71f290b4e98a39f49f2595a13be3b4d5ce8e1f1.tar.gz
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')
-rw-r--r--arch/metag/include/asm/processor.h2
-rw-r--r--arch/parisc/include/asm/processor.h2
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/metag/include/asm/processor.h b/arch/metag/include/asm/processor.h
index f16477d1f57..3be8581af49 100644
--- a/arch/metag/include/asm/processor.h
+++ b/arch/metag/include/asm/processor.h
@@ -22,6 +22,8 @@
/* Add an extra page of padding at the top of the stack for the guard page. */
#define STACK_TOP (TASK_SIZE - PAGE_SIZE)
#define STACK_TOP_MAX STACK_TOP
+/* Maximum virtual space for stack */
+#define STACK_SIZE_MAX (1 << 28) /* 256 MB */
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h
index 198a86feb57..86522ef09d5 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__