linux-kernel - [Patch 17/21] Calculate the size of the core file

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Date:	Tue, 14 Dec 2010 15:50:32 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [Patch 17/21] Calculate the size of the core file

Calculate the size of the core file

Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
Signed-off-by: Ananth N. Mavinakayanahalli <ananth@...ibm.com>

---
 fs/proc/gencore-elf.c |    6 ++++++
 fs/proc/gencore.h     |    1 +
 2 files changed, 7 insertions(+)

Index: linux-2.6.36-rc7/fs/proc/gencore.h
===================================================================
--- linux-2.6.36-rc7.orig/fs/proc/gencore.h
+++ linux-2.6.36-rc7/fs/proc/gencore.h
@@ -27,6 +27,7 @@ struct core_proc {
 	size_t elf_buflen;	/* size of elf_buf */
 	size_t nphdrs;		/* number of phdrs */
 	size_t notes_size;
+	size_t size;
 };
 
 extern void try_to_freeze_core_threads(struct core_proc *cp);
Index: linux-2.6.36-rc7/fs/proc/gencore-elf.c
===================================================================
--- linux-2.6.36-rc7.orig/fs/proc/gencore-elf.c
+++ linux-2.6.36-rc7/fs/proc/gencore-elf.c
@@ -310,6 +310,9 @@ static int create_elf_header(struct core
 						dataoff, cp->nphdrs);
 		dataoff += sizeof(struct elf_shdr);
 	}
+
+	cp->size = dataoff;
+
 	/* Store the notes */
 	tinfo = cp->tinfo;
 	do {
@@ -371,6 +374,9 @@ ssize_t elf_read_gencore(struct core_pro
 		}
 	}
 
+	if (*fpos > cp->size)
+		goto out;
+
 out:
 	return ret;
 }
--
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