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Commit a5a4d5a4 authored by Lijuan Gao's avatar Lijuan Gao Committed by lijuang
Browse files

lkdtm: Correct the size value for WRITE_KERN 



Correct the value of size, WRITE_KERN will not work as expected
if the do_overwritten is less than do_nothing.

Change-Id: I2c69c62829cd55f280efd63763316b91691c0620
Signed-off-by: default avatarLijuan Gao <lijuang@codeaurora.org>
parent 0778c6d8

drivers/misc/lkdtm/perms.c

+6 −1
Original line number Diff line number Diff line
@@ -109,7 +109,12 @@ void lkdtm_WRITE_KERN(void) 
	size_t size;

	unsigned char *ptr;



	size = (unsigned long)do_overwritten - (unsigned long)do_nothing;

	if ((unsigned long)do_overwritten < (unsigned long)do_nothing)

		size = (unsigned long)do_nothing -

				(unsigned long)do_overwritten;

	else

		size = (unsigned long)do_overwritten -

				(unsigned long)do_nothing;

	ptr = (unsigned char *)do_overwritten;



	pr_info("attempting bad %zu byte write at %px\n", size, ptr);