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[v3,09/12] binfmt_flat: use clear_user() rather than memset() to clear .bss

Message ID 1468988424-32671-10-git-send-email-nicolas.pitre@linaro.org
State New
Headers show

Commit Message

Nicolas Pitre July 20, 2016, 4:20 a.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 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.7.4
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Patch

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 28fc272d9a..0d89830f76 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -798,10 +798,11 @@  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: