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From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
To: vgoyal@redhat.com, ebiederm@xmission.com, cpw@sgi.com,
	kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com,
	heiko.carstens@de.ibm.com, akpm@linux-foundation.org
Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 05/20] vmcore: round up buffer size of ELF headers by PAGE_SIZE
Date: Sat, 02 Mar 2013 17:36:16 +0900	[thread overview]
Message-ID: <20130302083616.31252.73787.stgit@localhost6.localdomain6> (raw)
In-Reply-To: <20130302083447.31252.93914.stgit@localhost6.localdomain6>

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@jp.fujitsu.com>
---

 fs/proc/vmcore.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 1b02d01..c511cf4 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -340,7 +340,7 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
 	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;
@@ -353,6 +353,7 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
 	/* 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;
 }
@@ -449,7 +450,7 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
 	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;
@@ -462,6 +463,7 @@ static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
 	/* 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;
 }
@@ -482,9 +484,8 @@ static int __init process_ptload_program_headers_elf64(char *elfptr,
 	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)
@@ -519,9 +520,8 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
 	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)


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  parent reply	other threads:[~2013-03-05  7:05 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-02  8:35 [PATCH v2 00/20] kdump, vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke
2013-03-02  8:35 ` [PATCH v2 01/20] vmcore: refer to e_phoff member explicitly HATAYAMA Daisuke
2013-03-05  7:35   ` Zhang Yanfei
2013-03-10  6:46     ` Zhang Yanfei
2013-03-11  0:31       ` HATAYAMA Daisuke
2013-03-11 17:36         ` Vivek Goyal
2013-03-02  8:35 ` [PATCH v2 02/20] vmcore: rearrange program headers without assuming consequtive PT_NOTE entries HATAYAMA Daisuke
2013-03-05  8:36   ` Zhang Yanfei
2013-03-05  9:02     ` HATAYAMA Daisuke
2013-03-05  9:35       ` Zhang Yanfei
2013-03-02  8:36 ` [PATCH v2 03/20] vmcore, sysfs: export ELF note segment size instead of vmcoreinfo data size HATAYAMA Daisuke
2013-03-05  9:29   ` Zhang Yanfei
2013-03-06  0:07   ` HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 04/20] vmcore: allocate buffer for ELF headers on page-size alignment HATAYAMA Daisuke
2013-03-06  6:57   ` Zhang Yanfei
2013-03-06  9:14     ` HATAYAMA Daisuke
2013-03-02  8:36 ` HATAYAMA Daisuke [this message]
2013-03-06 15:51   ` [PATCH v2 05/20] vmcore: round up buffer size of ELF headers by PAGE_SIZE Yanfei Zhang
2013-03-02  8:36 ` [PATCH v2 06/20] vmcore, procfs: introduce a flag to distinguish objects copied in 2nd kernel HATAYAMA Daisuke
2013-03-06 15:55   ` Yanfei Zhang
2013-03-02  8:36 ` [PATCH v2 07/20] vmcore: copy non page-size aligned head and tail pages " HATAYAMA Daisuke
2013-03-10  6:16   ` Zhang Yanfei
2013-03-11  0:27     ` HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 08/20] vmcore: modify vmcore clean-up function to free buffer on " HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 09/20] vmcore: clean up read_vmcore() HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 10/20] vmcore: read buffers for vmcore objects copied from old memory HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 11/20] vmcore: allocate per-cpu crash_notes objects on page-size boundary HATAYAMA Daisuke
2013-03-02  8:36 ` [PATCH v2 12/20] kexec: allocate vmcoreinfo note buffer " HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 13/20] kexec, elf: introduce NT_VMCORE_DEBUGINFO note type HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 14/20] elf: introduce NT_VMCORE_PAD type HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 15/20] kexec: fill note buffers by NT_VMCORE_PAD notes in page-size boundary HATAYAMA Daisuke
2013-03-07 10:11   ` Zhang Yanfei
2013-03-08  1:55     ` HATAYAMA Daisuke
2013-03-08 13:02       ` Yanfei Zhang
2013-03-09  3:46         ` HATAYAMA Daisuke
2013-03-10  2:33           ` Zhang Yanfei
2013-03-02  8:37 ` [PATCH v2 16/20] vmcore: check NT_VMCORE_PAD as a mark indicating the end of ELF note buffer HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 17/20] vmcore: check if vmcore objects satify mmap()'s page-size boundary requirement HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 18/20] vmcore: round-up offset of vmcore object in page-size boundary HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 19/20] vmcore: count holes generated by round-up operation for vmcore size HATAYAMA Daisuke
2013-03-02  8:37 ` [PATCH v2 20/20] vmcore: introduce mmap_vmcore() HATAYAMA Daisuke

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