diff mbox

[v4,09/12] binfmt_flat: use clear_user() rather than memset() to clear .bss

Message ID 1469042561-7360-10-git-send-email-nicolas.pitre@linaro.org
State Superseded
Headers show

Commit Message

Nicolas Pitre July 20, 2016, 7:22 p.m. UTC 
This is needed on systems with a MMU.

Signed-off-by: Nicolas Pitre <nico@linaro.org>

Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>

---
 fs/binfmt_flat.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

-- 
2.7.4
diff mbox

Patch

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 63756ca6a7..92c1530a2c 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -795,10 +795,11 @@  static int load_flat_file(struct linux_binprm *bprm,
 	flush_icache_range(start_code, end_code);
 
 	/* zero the BSS,  BRK and stack areas */
-	memset((void *)(datapos + data_len), 0, bss_len +
-			(memp + memp_size - stack_len -		/* end brk */
-			libinfo->lib_list[id].start_brk) +	/* start brk */
-			stack_len);
+	if (clear_user((void __user *)(datapos + data_len), bss_len +
+		       (memp + memp_size - stack_len -		/* end brk */
+		       libinfo->lib_list[id].start_brk) +	/* start brk */
+		       stack_len))
+		return -EFAULT;
 
 	return 0;
 err: