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Groups > linux.kernel > #1446962

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

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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(-)

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:
-- 
2.7.4

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[PATCH v3 00/12] allow BFLT executables on systems with a MMU Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 01/12] binfmt_flat: assorted cleanups Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 03/12] binfmt_flat: prevent kernel dammage from corrupted executable headers Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 02/12] binfmt_flat: convert printk invocations to their modern form Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
    Re: [PATCH v3 02/12] binfmt_flat: convert printk invocations to  their modern form Joe Perches <joe@perches.com> - 2016-07-20 06:40 +0200
      Re: [PATCH v3 02/12] binfmt_flat: convert printk invocations to  their modern form Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 07:10 +0200
  [PATCH v3 08/12] binfmt_flat: use proper user space accessors with old relocs code Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 04/12] elf_fdpic_transfer_args_to_stack(): make it generic Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 12/12] binfmt_flat: allow compressed flat binary format to work on MMU systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 05/12] binfmt_flat: use generic transfer_args_to_stack() Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 10/12] binfmt_flat: update libraries' data segment pointer with userspace accessors Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 06/12] binfmt_flat: clean up create_flat_tables() and stack accesses Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 07/12] binfmt_flat: use proper user space accessors with relocs processing code Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
  [PATCH v3 09/12] binfmt_flat: use clear_user() rather than memset() to clear .bss Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200
    Re: [PATCH v3 09/12] binfmt_flat: use clear_user() rather than  memset() to clear .bss Greg Ungerer <gerg@linux-m68k.org> - 2016-07-20 09:20 +0200
  [PATCH v3 11/12] binfmt_flat: add MMU-specific support Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-20 06:30 +0200

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