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

From: Nicolas Pitre
Date: Sun Jul 17 2016 - 23:33:34 EST


This is needed on systems with a MMU.

Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxx>
---
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