linux-kernel - [PATCH v8 7/9] vmcore: Allow user process to remap ELF note segment buffer

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Message-ID: <20130523052536.13864.67507.stgit@localhost6.localdomain6>
Date:	Thu, 23 May 2013 14:25:36 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	vgoyal@...hat.com, ebiederm@...ssion.com, akpm@...ux-foundation.org
Cc:	cpw@....com, kumagai-atsushi@....nes.nec.co.jp,
	lisa.mitchell@...com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhangyanfei@...fujitsu.com,
	jingbai.ma@...com, linux-mm@...ck.org, riel@...hat.com,
	walken@...gle.com, hughd@...gle.com, kosaki.motohiro@...fujitsu.com
Subject: [PATCH v8 7/9] vmcore: Allow user process to remap ELF note segment
 buffer

Now ELF note segment has been copied in the buffer on vmalloc
memory. To allow user process to remap the ELF note segment buffer
with remap_vmalloc_page, the corresponding VM area object has to have
VM_USERMAP flag set.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
---

 fs/proc/vmcore.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 937709d..9de4d91 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -375,6 +375,7 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
 	Elf64_Ehdr *ehdr_ptr;
 	Elf64_Phdr phdr;
 	u64 phdr_sz = 0, note_off;
+	struct vm_struct *vm;
 
 	ehdr_ptr = (Elf64_Ehdr *)elfptr;
 
@@ -391,6 +392,12 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
 	if (!*notes_buf)
 		return -ENOMEM;
 
+	/* Allow users to remap ELF note segment buffer on vmalloc
+	 * memory using remap_vmalloc_range. */
+	vm = find_vm_area(*notes_buf);
+	BUG_ON(!vm);
+	vm->flags |= VM_USERMAP;
+
 	rc = copy_notes_elf64(ehdr_ptr, *notes_buf);
 	if (rc < 0)
 		return rc;
@@ -554,6 +561,7 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
 	Elf32_Ehdr *ehdr_ptr;
 	Elf32_Phdr phdr;
 	u64 phdr_sz = 0, note_off;
+	struct vm_struct *vm;
 
 	ehdr_ptr = (Elf32_Ehdr *)elfptr;
 
@@ -570,6 +578,12 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
 	if (!*notes_buf)
 		return -ENOMEM;
 
+	/* Allow users to remap ELF note segment buffer on vmalloc
+	 * memory using remap_vmalloc_range. */
+	vm = find_vm_area(*notes_buf);
+	BUG_ON(!vm);
+	vm->flags |= VM_USERMAP;
+
 	rc = copy_notes_elf32(ehdr_ptr, *notes_buf);
 	if (rc < 0)
 		return rc;

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