On Thu, Oct 03, 2013 at 06:47:44AM +0100, AKASHI Takahiro wrote:
In ftrace_syscall_enter(), syscall_get_arguments(..., 0, n, ...) if (i == 0) { <handle orig_x0> ...; n--;} memcpy(..., n * sizeof(args[0])); If 'number of arguments(n)' is zero and 'argument index(i)' is also zero in syscall_get_arguments(), none of arguments should be copied by memcpy(). Otherwise 'n--' can be a big positive number and unexpected amount of data will be copied. Tracing system calls which take no argument, say sync(void), may hit this case and eventually make the system corrupted. This patch fixes the issue both in syscall_get_arguments() and syscall_set_arguments().
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org
Acked-by: Will Deacon will.deacon@arm.com
Cheers,
Will