linux-kernel - [PATCH 17/19] Identify the ELF class of the process

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Date:	Fri, 04 Oct 2013 16:02:57 +0530
From:	Janani Venkataraman <jananive@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	amwang@...hat.com, rdunlap@...otime.net, andi@...stfloor.org,
	aravinda@...ux.vnet.ibm.com, hch@....de, mhiramat@...hat.com,
	jeremy.fitzhardinge@...rix.com, xemul@...allels.com,
	suzuki@...ux.vnet.ibm.com, kosaki.motohiro@...fujitsu.com,
	adobriyan@...il.com, tarundsk@...ux.vnet.ibm.com,
	vapier@...too.org, roland@...k.frob.com, tj@...nel.org,
	ananth@...ux.vnet.ibm.com, gorcunov@...nvz.org, avagin@...nvz.org,
	oleg@...hat.com, eparis@...hat.com, d.hatayama@...fujitsu.com,
	james.hogan@...tec.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH 17/19] Identify the ELF class of the process

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

Identify the ELF class of the process to native or compat.

Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
---
 fs/proc/gencore.c |   17 ++++++++++++++---
 fs/proc/gencore.h |    3 +++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/fs/proc/gencore.c b/fs/proc/gencore.c
index 463bedd..3e0db30 100644
--- a/fs/proc/gencore.c
+++ b/fs/proc/gencore.c
@@ -64,6 +64,9 @@ static ssize_t read_gencore(struct file *file, char __user *buffer,
 	}
 	mutex_unlock(&core_mutex);
 
+	if (cp->elf_class == ELF_CLASS_NATIVE)
+		ret = elf_read_gencore(cp, buffer, buflen, fpos);
+
 out:
 	put_task_struct(task);
 	return ret;
@@ -147,8 +150,8 @@ static int release_gencore(struct inode *inode, struct file *file)
  /*
  * Determine whether the task is an ELF executable.
  * Returns
- *     < 0     - Non-ELF
- *     0       - Native ELF Executable
+ *     -EINVAL - On non ELF execs
+ *     Returns the ELF_CLASS_NATIVE or ELF_CLASS_COMPAT
  */
 static int get_elf_class(struct task_struct *task)
 {
@@ -162,7 +165,14 @@ static int get_elf_class(struct task_struct *task)
 	if (memcmp(hdr.e_ident, ELFMAG, SELFMAG))
 		return -EINVAL;
 	if (elf_check_arch(&hdr))
-		return 0;
+		return ELF_CLASS_NATIVE;
+#ifdef CONFIG_COMPAT_BINFMT_ELF
+	{ 
+		struct elf32_hdr *chdr = (struct elf32_hdr *)&hdr;
+		if (compat_elf_check_arch(chdr))
+			return ELF_CLASS_COMPAT;
+	}
+#endif
 	
 	return -EINVAL;
 }
@@ -206,6 +216,7 @@ static int open_gencore(struct inode *inode, struct file *filp)
 	list_add(&cp->list, &core_list);
 	mutex_unlock(&core_mutex);
 	max_regset = get_max_regsets(task);
+	cp->elf_class = elf_class;
 
 	for (i = 0; i < get_nr_threads(task); i++) {
 		tinfo = kzalloc(offsetof(struct elf_thread_core_info,
diff --git a/fs/proc/gencore.h b/fs/proc/gencore.h
index f6822f2..d7a5fb3 100644
--- a/fs/proc/gencore.h
+++ b/fs/proc/gencore.h
@@ -8,6 +8,8 @@
 #include <linux/elfcore.h>
 #include <linux/elfcore-internal.h>
 
+enum { ELF_CLASS_NATIVE, ELF_CLASS_COMPAT };
+
 struct elf_thread_core_info {
 	unsigned short num_notes;       /* Number of notes for this thread */
 	struct elf_thread_core_info *next;
@@ -31,6 +33,7 @@ struct core_proc {
 	size_t nphdrs;          /* number of phdrs */
 	size_t notes_size;
 	size_t size;
+	unsigned char elf_class;
 };
 
 #ifdef CORE_DUMP_USE_REGSET

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