linux-kernel - [RFC/PATCH] nommu: fix ksize() abuse

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Date:	Thu, 22 May 2008 19:11:40 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	dhowells@...hat.com
cc:	clameter@....com, mpm@...enic.com, lethal@...ux-sh.org,
	linux-kernel@...r.kernel.org
Subject: [RFC/PATCH] nommu: fix ksize() abuse

From: Pekka Enberg <penberg@...helsinki.fi>

The nommu binfmt code uses ksize() for pointers returned from do_mmap() 
which is wrong. This converts the call-sites to use the nommu specific 
kobjsize() function which works as expected.

Cc: Christoph Lameter <clameter@....com>
Cc: Matt Mackall <mpm@...enic.com>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: David Howells <dhowells@...hat.com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 fs/binfmt_elf_fdpic.c |    2 +-
 fs/binfmt_flat.c      |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index ddd35d8..d051a32 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -390,7 +390,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
 	}
 
 	/* expand the stack mapping to use up the entire allocation granule */
-	fullsize = ksize((char *) current->mm->start_brk);
+	fullsize = kobjsize((char *) current->mm->start_brk);
 	if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
 				    fullsize, 0, 0)))
 		stack_size = fullsize;
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 3b40d45..2cb1acd 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -548,7 +548,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 			PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
 		/* Remap to use all availabe slack region space */
 		if (realdatastart && (realdatastart < (unsigned long)-4096)) {
-			reallen = ksize((void *)realdatastart);
+			reallen = kobjsize((void *)realdatastart);
 			if (reallen > len) {
 				realdatastart = do_mremap(realdatastart, len,
 					reallen, MREMAP_FIXED, realdatastart);
@@ -600,7 +600,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 			PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
 		/* Remap to use all availabe slack region space */
 		if (textpos && (textpos < (unsigned long) -4096)) {
-			reallen = ksize((void *)textpos);
+			reallen = kobjsize((void *)textpos);
 			if (reallen > len) {
 				textpos = do_mremap(textpos, len, reallen,
 					MREMAP_FIXED, textpos);
@@ -683,7 +683,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 		 */
 		current->mm->start_brk = datapos + data_len + bss_len;
 		current->mm->brk = (current->mm->start_brk + 3) & ~3;
-		current->mm->context.end_brk = memp + ksize((void *) memp) - stack_len;
+		current->mm->context.end_brk = memp + kobjsize((void *) memp) - stack_len;
 	}
 
 	if (flags & FLAT_FLAG_KTRACE)
@@ -790,7 +790,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 
 	/* zero the BSS,  BRK and stack areas */
 	memset((void*)(datapos + data_len), 0, bss_len + 
-			(memp + ksize((void *) memp) - stack_len -	/* end brk */
+			(memp + kobjsize((void *) memp) - stack_len -	/* end brk */
 			libinfo->lib_list[id].start_brk) +		/* start brk */
 			stack_len);
 
-- 
1.5.2.5

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