[PATCH v2 07/10] binfmt_flat: use clear_user() rather than memset() to clear .bss

[Nicolas Pitre]

This is needed on systems with a MMU.

Signed-off-by: Nicolas Pitre <n...@linaro.org>
---
 fs/binfmt_flat.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index c85f8f1239..e981e66bb5 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -803,10 +803,11 @@ 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 + 
+       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);
+                       stack_len))
+               return -EFAULT;
 
        return 0;
 err:
-- 
2.7.4