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vmcore: allow user process to remap ELF note segment buffer

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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.

[akpm@linux-foundation.org: use the conventional comment layout]
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>
Cc: Lisa Mitchell <lisa.mitchell@hp.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
HATAYAMA Daisuke 2013-07-03 15:02:21 -07:00 committed by Linus Torvalds
parent 087350c9dc
commit ef9e78fd27
1 changed files with 18 additions and 0 deletions
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18
fs/proc/vmcore.c
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@ -369,6 +369,7 @@ 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;
@ -385,6 +386,14 @@ 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;
@ -548,6 +557,7 @@ 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;
@ -564,6 +574,14 @@ 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;