linux-kernel - [PATCH 03/03] Elf: Fix kcore note size calculation

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Message-Id: <20061114130114.24180.76834.sendpatchset@localhost>
Date:	Tue, 14 Nov 2006 22:01:14 +0900
From:	Magnus Damm <magnus@...inux.co.jp>
To:	linux-kernel@...r.kernel.org
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Vivek Goyal <vgoyal@...ibm.com>, magnus.damm@...il.com,
	Magnus Damm <magnus@...inux.co.jp>, Horms <horms@...ge.net.au>,
	Dave Anderson <anderson@...hat.com>, ebiederm@...ssion.com,
	Jakub Jelinek <jakub@...hat.com>,
	David Miller <davem@...emloft.net>
Subject: [PATCH 03/03] Elf: Fix kcore note size calculation

elf: fix kcore note size calculation

- Define "CORE" string as CORE_STR in single common place.
- Include terminating zero in CORE_STR length calculation for elf_buflen.
- Use roundup(,4) to include alignment in elf_buflen calculation.

Signed-off-by: Magnus Damm <magnus@...inux.co.jp>
---

 fs/proc/kcore.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- 0002/fs/proc/kcore.c
+++ work/fs/proc/kcore.c	2006-11-14 21:17:16.000000000 +0900
@@ -22,6 +22,7 @@
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
+#define CORE_STR "CORE"
 
 static int open_kcore(struct inode * inode, struct file * filp)
 {
@@ -82,10 +83,11 @@ static size_t get_kcore_size(int *nphdr,
 	}
 	*elf_buflen =	sizeof(struct elfhdr) + 
 			(*nphdr + 2)*sizeof(struct elf_phdr) + 
-			3 * (sizeof(struct elf_note) + 4) +
-			sizeof(struct elf_prstatus) +
-			sizeof(struct elf_prpsinfo) +
-			sizeof(struct task_struct);
+			3 * ((sizeof(struct elf_note)) +
+			     roundup(strlen(CORE_STR) + 1, 4)) +
+			roundup(sizeof(struct elf_prstatus), 4) +
+			roundup(sizeof(struct elf_prpsinfo), 4) +
+			roundup(sizeof(struct task_struct), 4);
 	*elf_buflen = PAGE_ALIGN(*elf_buflen);
 	return size + *elf_buflen;
 }
@@ -210,7 +212,7 @@ static void elf_kcore_store_hdr(char *bu
 	nhdr->p_offset	= offset;
 
 	/* set up the process status */
-	notes[0].name = "CORE";
+	notes[0].name = CORE_STR;
 	notes[0].type = NT_PRSTATUS;
 	notes[0].datasz = sizeof(struct elf_prstatus);
 	notes[0].data = &prstatus;
@@ -221,7 +223,7 @@ static void elf_kcore_store_hdr(char *bu
 	bufp = storenote(&notes[0], bufp);
 
 	/* set up the process info */
-	notes[1].name	= "CORE";
+	notes[1].name	= CORE_STR;
 	notes[1].type	= NT_PRPSINFO;
 	notes[1].datasz	= sizeof(struct elf_prpsinfo);
 	notes[1].data	= &prpsinfo;
@@ -238,7 +240,7 @@ static void elf_kcore_store_hdr(char *bu
 	bufp = storenote(&notes[1], bufp);
 
 	/* set up the task structure */
-	notes[2].name	= "CORE";
+	notes[2].name	= CORE_STR;
 	notes[2].type	= NT_TASKSTRUCT;
 	notes[2].datasz	= sizeof(struct task_struct);
 	notes[2].data	= current;
-
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