On 3/20/20 10:48 AM, Greg Kroah-Hartman wrote:
For the bpf syscall, we are relying on the compiler to properly zero out the bpf_attr union that we copy userspace data into. Unfortunately that doesn't always work properly, padding and other oddities might not be correctly zeroed, and in some tests odd things have been found when the stack is pre-initialized to other values. Fix this by explicitly memsetting the structure to 0 before using it. Reported-by: Maciej Żenczykowski <maze@xxxxxxxxxx> Reported-by: John Stultz <john.stultz@xxxxxxxxxx> Reported-by: Alexander Potapenko <glider@xxxxxxxxxx> Reported-by: Alistair Delva <adelva@xxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Link: https://android-review.googlesource.com/c/kernel/common/+/1235490 Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Applied, thanks!
