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binfmt_flat: use clear_user() rather than memset() to clear .bss 

This is needed on systems with a MMU.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
This commit is contained in:
Nicolas Pitre 2016-07-24 11:30:23 -04:00 committed by Greg Ungerer
parent 1b2ce442ea
commit 467aa1465a
1 changed files with 5 additions and 4 deletions
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9
fs/binfmt_flat.c
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@ -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: