bpf: rather use get_random_int for randomizations

Start address randomization and blinding in BPF currently use
prandom_u32(). prandom_u32() values are not exposed to unpriviledged
user space to my knowledge, but given other kernel facilities such as
ASLR, stack canaries, etc make use of stronger get_random_int(), we
better make use of it here as well given blinding requests successively
new random values. get_random_int() has minimal entropy pool depletion,
is not cryptographically secure, but doesn't need to be for our use
cases here.

Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f1e8a0def99b..b94a36550591 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -231,7 +231,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
         hdr->pages = size / PAGE_SIZE;
         hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)),
                      PAGE_SIZE - sizeof(*hdr));
-        start = (prandom_u32() % hole) & ~(alignment - 1);
+        start = (get_random_int() % hole) & ~(alignment - 1);
 
         /* Leave a random number of instructions before BPF code. */
         *image_ptr = &hdr->image[start];
@@ -251,7 +251,7 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
                               struct bpf_insn *to_buff)
 {
         struct bpf_insn *to = to_buff;
-        u32 imm_rnd = prandom_u32();
+        u32 imm_rnd = get_random_int();
         s16 off;
 
         BUILD_BUG_ON(BPF_REG_AX  + 1 != MAX_BPF_JIT_REG);