The patch titled
Subject: vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer
has been added to the -mm tree. Its filename is
vmcore-check-nt_vmcore_pad-as-a-mark-indicating-the-end-of-elf-note-buffer.patch
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------------------------------------------------------
From: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxxxxx>
Subject: vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer
Modern kernel marks the end of ELF note buffer with NT_VMCORE_PAD type
note in order to make the buffer satisfy mmap()'s page-size boundary
requirement. This patch makes finishing reading each buffer if the note
type now being read is NT_VMCORE_PAD type.
Signed-off-by: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxxxxx>
Cc: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/vmcore.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff -puN fs/proc/vmcore.c~vmcore-check-nt_vmcore_pad-as-a-mark-indicating-the-end-of-elf-note-buffer fs/proc/vmcore.c
--- a/fs/proc/vmcore.c~vmcore-check-nt_vmcore_pad-as-a-mark-indicating-the-end-of-elf-note-buffer
+++ a/fs/proc/vmcore.c
@@ -258,12 +258,24 @@ static int __init merge_note_headers_elf
}
nhdr_ptr = notes_section;
while (real_sz < max_sz) {
+ char *name;
+
+ /* Old kernel marks the end of ELF note buffer
+ * with empty header. */
if (nhdr_ptr->n_namesz == 0)
break;
sz = sizeof(Elf64_Nhdr) +
((nhdr_ptr->n_namesz + 3) & ~3) +
((nhdr_ptr->n_descsz + 3) & ~3);
real_sz += sz;
+
+ /* Modern kernel marks the end of ELF note
+ * buffer with NT_VMCORE_PAD type note. */
+ name = (char *)(nhdr_ptr + 1);
+ if (strncmp(name, VMCOREINFO_NOTE_NAME,
+ sizeof(VMCOREINFO_NOTE_NAME)) == 0
+ && nhdr_ptr->n_type == NT_VMCORE_PAD)
+ break;
nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
}
@@ -367,12 +379,24 @@ static int __init merge_note_headers_elf
}
nhdr_ptr = notes_section;
while (real_sz < max_sz) {
+ char *name;
+
+ /* Old kernel marks the end of ELF note buffer
+ * with empty header. */
if (nhdr_ptr->n_namesz == 0)
break;
sz = sizeof(Elf32_Nhdr) +
((nhdr_ptr->n_namesz + 3) & ~3) +
((nhdr_ptr->n_descsz + 3) & ~3);
real_sz += sz;
+
+ /* Modern kernel marks the end of ELF note
+ * buffer with NT_VMCORE_PAD type note. */
+ name = (char *)(nhdr_ptr + 1);
+ if (strncmp(name, VMCOREINFO_NOTE_NAME,
+ sizeof(VMCOREINFO_NOTE_NAME)) == 0
+ && nhdr_ptr->n_type == NT_VMCORE_PAD)
+ break;
nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
}
_
Patches currently in -mm which might be from d.hatayama@xxxxxxxxxxxxxx are
vmcore-reference-e_phoff-member-explicitly-to-get-position-of-program-header-table.patch
vmcore-clean-up-by-removing-unnecessary-variable.patch
vmcore-rearrange-program-headers-without-assuming-consequtive-pt_note-entries.patch
vmcore-sysfs-export-elf-note-segment-size-instead-of-vmcoreinfo-data-size.patch
vmcore-allocate-buffer-for-elf-headers-on-page-size-alignment.patch
vmcore-round-up-buffer-size-of-elf-headers-by-page_size.patch
vmcore-procfs-introduce-a-flag-to-distinguish-objects-copied-in-2nd-kernel.patch
vmcore-copy-non-page-size-aligned-head-and-tail-pages-in-2nd-kernel.patch
vmcore-modify-vmcore-clean-up-function-to-free-buffer-on-2nd-kernel.patch
vmcore-clean-up-read_vmcore.patch
vmcore-read-buffers-for-vmcore-objects-copied-from-old-memory.patch
vmcore-allocate-per-cpu-crash_notes-objects-on-page-size-boundary.patch
kexec-allocate-vmcoreinfo-note-buffer-on-page-size-boundary.patch
kexec-elf-introduce-nt_vmcore_debuginfo-note-type.patch
elf-introduce-nt_vmcore_pad-type.patch
kexec-fill-note-buffers-by-nt_vmcore_pad-notes-in-page-size-boundary.patch
vmcore-check-nt_vmcore_pad-as-a-mark-indicating-the-end-of-elf-note-buffer.patch
vmcore-check-if-vmcore-objects-satify-mmaps-page-size-boundary-requirement.patch
vmcore-round-up-offset-of-vmcore-object-in-page-size-boundary.patch
vmcore-count-holes-generated-by-round-up-operation-for-vmcore-size.patch
vmcore-introduce-mmap_vmcore.patch
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