[PATCH 15/19] Calculate the size of the core file

[Janani Venkataraman <jananive@in.ibm.com>]

From:Suzuki K. Poulose <suzuki@in.ibm.com>

Calculate the size of the core file

Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Signed-off-by: Ananth N. Mavinakayanahalli <ananth@in.ibm.com>
---
 fs/proc/gencore-elf.c |    6 ++++++
 fs/proc/gencore.h     |    1 +
 2 files changed, 7 insertions(+)

diff --git a/fs/proc/gencore-elf.c b/fs/proc/gencore-elf.c
index 6e97f6a..efd1722 100644
--- a/fs/proc/gencore-elf.c
+++ b/fs/proc/gencore-elf.c
@@ -291,6 +291,9 @@ static int create_elf_header(struct core_proc *cp)
 						dataoff, cp->nphdrs);
 		dataoff += sizeof(struct elf_shdr);
 	}
+
+	cp->size = dataoff;
+
 	/* Store the notes */
 	tinfo = cp->tinfo;
 	do {
@@ -351,6 +354,9 @@ ssize_t elf_read_gencore(struct core_proc *cp, char __user *buffer,
 			buffer += bcp;
 		}
 	}
+	if (*fpos > cp->size)
+		goto out;
+  
 out:
 	return ret;
 }
diff --git a/fs/proc/gencore.h b/fs/proc/gencore.h
index e508417..f6822f2 100644
--- a/fs/proc/gencore.h
+++ b/fs/proc/gencore.h
@@ -30,6 +30,7 @@ struct core_proc {
 	size_t elf_buflen;      /* size of elf_buf */
 	size_t nphdrs;          /* number of phdrs */
 	size_t notes_size;
+	size_t size;
 };
 
 #ifdef CORE_DUMP_USE_REGSET