BLAKE2s is faster and more secure. SHA-1 has been broken for a long time
now. This also removes quite a bit of code, and lets us potentially
remove sha1 from lib, which would further reduce vmlinux size.
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Jean-Philippe Aumasson <jeanphilippe.aumasson@xxxxxxxxx>
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
---
kernel/bpf/core.c | 39 ++++-----------------------------------
1 file changed, 4 insertions(+), 35 deletions(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index de3e5bc6781f..20a799d36ba8 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -33,6 +33,7 @@
#include <linux/extable.h>
#include <linux/log2.h>
#include <linux/bpf_verifier.h>
+#include <crypto/blake2s.h>
#include <asm/barrier.h>
#include <asm/unaligned.h>
@@ -265,24 +266,16 @@ void __bpf_prog_free(struct bpf_prog *fp)
int bpf_prog_calc_tag(struct bpf_prog *fp)
{
- const u32 bits_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
u32 raw_size = bpf_prog_tag_scratch_size(fp);
- u32 digest[SHA1_DIGEST_WORDS];
- u32 ws[SHA1_WORKSPACE_WORDS];
- u32 i, bsize, psize, blocks;
struct bpf_insn *dst;
bool was_ld_map;
- u8 *raw, *todo;
- __be32 *result;
- __be64 *bits;
+ u8 *raw;
+ int i;
raw = vmalloc(raw_size);
if (!raw)
return -ENOMEM;
- sha1_init(digest);
- memset(ws, 0, sizeof(ws));
-
/* We need to take out the map fd for the digest calculation
* since they are unstable from user space side.
*/
@@ -307,31 +300,7 @@ int bpf_prog_calc_tag(struct bpf_prog *fp)
}
}
- psize = bpf_prog_insn_size(fp);
- memset(&raw[psize], 0, raw_size - psize);
- raw[psize++] = 0x80;
-
- bsize = round_up(psize, SHA1_BLOCK_SIZE);
- blocks = bsize / SHA1_BLOCK_SIZE;
- todo = raw;
- if (bsize - psize >= sizeof(__be64)) {
- bits = (__be64 *)(todo + bsize - sizeof(__be64));
- } else {
- bits = (__be64 *)(todo + bsize + bits_offset);
- blocks++;
- }
- *bits = cpu_to_be64((psize - 1) << 3);
-
- while (blocks--) {
- sha1_transform(digest, todo, ws);
- todo += SHA1_BLOCK_SIZE;
- }
-
- result = (__force __be32 *)digest;
- for (i = 0; i < SHA1_DIGEST_WORDS; i++)
- result[i] = cpu_to_be32(digest[i]);
- memcpy(fp->tag, result, sizeof(fp->tag));
-
+ blake2s(fp->tag, raw, NULL, sizeof(fp->tag), bpf_prog_insn_size(fp), 0);
vfree(raw);
return 0;
}
--
2.34.1
