The patch titled
Subject: vmcore: round up buffer size of ELF headers by PAGE_SIZE
has been added to the -mm tree. Its filename is
vmcore-round-up-buffer-size-of-elf-headers-by-page_size.patch
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------------------------------------------------------
From: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxxxxx>
Subject: vmcore: round up buffer size of ELF headers by PAGE_SIZE
To satisfy mmap() page-size boundary requirement, round up buffer size of
ELF headers by PAGE_SIZE. The resulting value becomes offset of ELF note
segments and it's assigned in unique PT_NOTE program header entry.
Also, some part that assumes past ELF headers' size is replaced by this
new rounded-up value.
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 | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff -puN fs/proc/vmcore.c~vmcore-round-up-buffer-size-of-elf-headers-by-page_size fs/proc/vmcore.c
--- a/fs/proc/vmcore.c~vmcore-round-up-buffer-size-of-elf-headers-by-page_size
+++ a/fs/proc/vmcore.c
@@ -339,7 +339,7 @@ static int __init merge_note_headers_elf
phdr.p_flags = 0;
note_off = ehdr_ptr->e_phoff +
(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
- phdr.p_offset = note_off;
+ phdr.p_offset = roundup(note_off, PAGE_SIZE);
phdr.p_vaddr = phdr.p_paddr = 0;
phdr.p_filesz = phdr.p_memsz = phdr_sz;
phdr.p_align = 0;
@@ -352,6 +352,7 @@ static int __init merge_note_headers_elf
/* Modify e_phnum to reflect merged headers. */
ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
+ *elfsz = roundup(*elfsz, PAGE_SIZE);
out:
return 0;
}
@@ -447,7 +448,7 @@ static int __init merge_note_headers_elf
phdr.p_flags = 0;
note_off = ehdr_ptr->e_phoff +
(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
- phdr.p_offset = note_off;
+ phdr.p_offset = roundup(note_off, PAGE_SIZE);
phdr.p_vaddr = phdr.p_paddr = 0;
phdr.p_filesz = phdr.p_memsz = phdr_sz;
phdr.p_align = 0;
@@ -460,6 +461,7 @@ static int __init merge_note_headers_elf
/* Modify e_phnum to reflect merged headers. */
ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
+ *elfsz = roundup(*elfsz, PAGE_SIZE);
out:
return 0;
}
@@ -480,9 +482,8 @@ static int __init process_ptload_program
phdr_ptr = (Elf64_Phdr*)(elfptr + ehdr_ptr->e_phoff); /* PT_NOTE hdr */
/* First program header is PT_NOTE header. */
- vmcore_off = ehdr_ptr->e_phoff +
- (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
- phdr_ptr->p_memsz; /* Note sections */
+ vmcore_off = phdr_ptr->p_offset + roundup(phdr_ptr->p_memsz,
+ PAGE_SIZE);
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
if (phdr_ptr->p_type != PT_LOAD)
@@ -517,9 +518,8 @@ static int __init process_ptload_program
phdr_ptr = (Elf32_Phdr*)(elfptr + ehdr_ptr->e_phoff); /* PT_NOTE hdr */
/* First program header is PT_NOTE header. */
- vmcore_off = ehdr_ptr->e_phoff +
- (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
- phdr_ptr->p_memsz; /* Note sections */
+ vmcore_off = phdr_ptr->p_offset + roundup(phdr_ptr->p_memsz,
+ PAGE_SIZE);
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
if (phdr_ptr->p_type != PT_LOAD)
_
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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