linux-kernel - [PATCH v3 19/21] vmcore: round-up offset of vmcore object in page-size boundary

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Message-ID: <20130316040234.15064.1158.stgit@localhost6.localdomain6>
Date:	Sat, 16 Mar 2013 13:02:34 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	vgoyal@...hat.com, ebiederm@...ssion.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	heiko.carstens@...ibm.com, akpm@...ux-foundation.org
Cc:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	zhangyanfei@...fujitsu.com
Subject: [PATCH v3 19/21] vmcore: round-up offset of vmcore object in
 page-size boundary

To satisfy mmap()'s page-size bounary requirement, round-up offset of
each vmcore objects in page-size boundary; each offset is connected to
user-space virtual address through mapping of mmap().

Signed-off-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
---

 fs/proc/vmcore.c |   18 ++++++++----------
 1 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 0077a9a..f15c881 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -698,7 +698,7 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
 }
 
 /* Sets offset fields of vmcore elements. */
-static void __init set_vmcore_list_offsets_elf64(char *elfptr,
+static void __init set_vmcore_list_offsets_elf64(char *elfptr, size_t elfsz,
 						struct list_head *vc_list)
 {
 	loff_t vmcore_off;
@@ -708,17 +708,16 @@ static void __init set_vmcore_list_offsets_elf64(char *elfptr,
 	ehdr_ptr = (Elf64_Ehdr *)elfptr;
 
 	/* Skip Elf header and program headers. */
-	vmcore_off = ehdr_ptr->e_phoff +
-			(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
+	vmcore_off = elfsz;
 
 	list_for_each_entry(m, vc_list, list) {
 		m->offset = vmcore_off;
-		vmcore_off += m->size;
+		vmcore_off += roundup(m->size, PAGE_SIZE);
 	}
 }
 
 /* Sets offset fields of vmcore elements. */
-static void __init set_vmcore_list_offsets_elf32(char *elfptr,
+static void __init set_vmcore_list_offsets_elf32(char *elfptr, size_t elfsz,
 						struct list_head *vc_list)
 {
 	loff_t vmcore_off;
@@ -728,12 +727,11 @@ static void __init set_vmcore_list_offsets_elf32(char *elfptr,
 	ehdr_ptr = (Elf32_Ehdr *)elfptr;
 
 	/* Skip Elf header and program headers. */
-	vmcore_off = ehdr_ptr->e_phoff +
-			(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
+	vmcore_off = elfsz;
 
 	list_for_each_entry(m, vc_list, list) {
 		m->offset = vmcore_off;
-		vmcore_off += m->size;
+		vmcore_off += roundup(m->size, PAGE_SIZE);
 	}
 }
 
@@ -801,7 +799,7 @@ static int __init parse_crash_elf64_headers(void)
 			   get_order(elfcorebuf_sz_orig));
 		return rc;
 	}
-	set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
+	set_vmcore_list_offsets_elf64(elfcorebuf, elfcorebuf_sz, &vmcore_list);
 	return 0;
 }
 
@@ -869,7 +867,7 @@ static int __init parse_crash_elf32_headers(void)
 			   get_order(elfcorebuf_sz_orig));
 		return rc;
 	}
-	set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
+	set_vmcore_list_offsets_elf32(elfcorebuf, elfcorebuf_sz, &vmcore_list);
 	return 0;
 }
 

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