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From: Roland McGrath <roland@redhat.com>
To: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 3/11] Add VM_ALWAYSDUMP
Date: Sat, 13 Jan 2007 21:33:50 -0800 (PST)	[thread overview]
Message-ID: <20070114053350.5AA811800E5@magilla.sf.frob.com> (raw)
In-Reply-To: Roland McGrath's message of  Saturday, 13 January 2007 21:31:39 -0800 <20070114053140.351701800E5@magilla.sf.frob.com>


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: Roland McGrath <roland@redhat.com>
---
 fs/binfmt_elf.c    |    4 ++++
 include/linux/mm.h |    1 +
 2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7cb2872..6fec8bf 100644  
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1178,6 +1178,10 @@ static int dump_seek(struct file *file, 
  */
 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 */
 	if (vma->vm_flags & (VM_IO | VM_RESERVED))
 		return 0;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7691223..2d2c08d 100644  
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -168,6 +168,7 @@ extern unsigned int kobjsize(const void 
 #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_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 */
 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS

  parent reply	other threads:[~2007-01-14  5:33 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-14  5:31 [PATCH 1/11] Fix CONFIG_COMPAT_VDSO Roland McGrath
2007-01-14  5:33 ` [PATCH 2/11] Fix gate_vma.vm_flags Roland McGrath
2007-01-14  5:33 ` Roland McGrath [this message]
2007-01-14  5:34 ` [PATCH 4/11] i386 vDSO: use VM_ALWAYSDUMP Roland McGrath
2007-01-23 19:48   ` Andrew Morton
2007-01-23 19:57     ` Linus Torvalds
2007-01-23 20:11       ` Roland McGrath
2007-01-23 19:57     ` Roland McGrath
2007-01-14  5:34 ` [PATCH 5/11] x86_64 ia32 " Roland McGrath
2007-01-14  5:35 ` [PATCH 6/11] powerpc " Roland McGrath
2007-01-14  5:36 ` [PATCH 7/11] x86_64 ia32 vDSO: define arch_vma_name Roland McGrath
2007-01-14  5:36 ` [PATCH 8/11] Add install_special_mapping Roland McGrath
2007-01-14  5:36 ` [PATCH 9/11] i386 vDSO: use install_special_mapping Roland McGrath
2007-01-14  5:37 ` [PATCH 10/11] x86_64 ia32 " Roland McGrath
2007-01-14  5:37 ` [PATCH 11/11] powerpc " Roland McGrath
2007-01-17  8:49 ` [PATCH 1/11] Fix CONFIG_COMPAT_VDSO Ingo Molnar
2007-01-17  9:03   ` Roland McGrath
2007-01-24 10:25     ` Paul Mundt

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