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Commit e5b97dde authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

[PATCH] Add VM_ALWAYSDUMP 



This patch adds the VM_ALWAYSDUMP flag for vm_flags in vm_area_struct.  This
provides a clean explicit way to have a vma always included in core dumps, as
is needed for vDSO's.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b6558c4a

fs/binfmt_elf.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -1178,6 +1178,10 @@ static int dump_seek(struct file *file, loff_t off) 
 */

 */

static int maydump(struct vm_area_struct *vma)

static int maydump(struct vm_area_struct *vma)

{

{

	/* The vma can be set up to tell us the answer directly.  */

	if (vma->vm_flags & VM_ALWAYSDUMP)

		return 1;



	/* Do not dump I/O mapped devices or special mappings */

	/* Do not dump I/O mapped devices or special mappings */

	if (vma->vm_flags & (VM_IO | VM_RESERVED))

	if (vma->vm_flags & (VM_IO | VM_RESERVED))

		return 0;

		return 0;

include/linux/mm.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -168,6 +168,7 @@ extern unsigned int kobjsize(const void *objp); 
#define VM_NONLINEAR	0x00800000	/* Is non-linear (remap_file_pages) */

#define VM_NONLINEAR	0x00800000	/* Is non-linear (remap_file_pages) */

#define VM_MAPPED_COPY	0x01000000	/* T if mapped copy of data (nommu mmap) */

#define VM_MAPPED_COPY	0x01000000	/* T if mapped copy of data (nommu mmap) */

#define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */

#define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */

#define VM_ALWAYSDUMP	0x04000000	/* Always include in core dumps */





#ifndef VM_STACK_DEFAULT_FLAGS		/* arch can override this */

#ifndef VM_STACK_DEFAULT_FLAGS		/* arch can override this */

#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS

#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS