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authorHATAYAMA Daisuke2013-07-03 15:02:21 -0700
committerLinus Torvalds2013-07-03 16:07:30 -0700
commitef9e78fd2753213ea01d77f7a76a9cb6ad0f50a7 (patch)
tree176cc825df5908c17d21d63124367b555da6f557 /fs/proc
parent087350c9dcf1b38c597b31d7761f7366e2866e6b (diff)
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. [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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/vmcore.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 9b9270eb0599..1082492e02fc 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -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;