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Diffstat (limited to 'kernel/bpf/core.c')
-rw-r--r--kernel/bpf/core.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 83e0d153b0b4..75c08b8068d6 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -136,28 +136,29 @@ void __bpf_prog_free(struct bpf_prog *fp)
vfree(fp);
}
-#define SHA_BPF_RAW_SIZE \
- round_up(MAX_BPF_SIZE + sizeof(__be64) + 1, SHA_MESSAGE_BYTES)
-
-/* Called under verifier mutex. */
-void bpf_prog_calc_digest(struct bpf_prog *fp)
+int bpf_prog_calc_digest(struct bpf_prog *fp)
{
const u32 bits_offset = SHA_MESSAGE_BYTES - sizeof(__be64);
- static u32 ws[SHA_WORKSPACE_WORDS];
- static u8 raw[SHA_BPF_RAW_SIZE];
- struct bpf_insn *dst = (void *)raw;
+ u32 raw_size = bpf_prog_digest_scratch_size(fp);
+ u32 ws[SHA_WORKSPACE_WORDS];
u32 i, bsize, psize, blocks;
+ struct bpf_insn *dst;
bool was_ld_map;
- u8 *todo = raw;
+ u8 *raw, *todo;
__be32 *result;
__be64 *bits;
+ raw = vmalloc(raw_size);
+ if (!raw)
+ return -ENOMEM;
+
sha_init(fp->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.
*/
+ dst = (void *)raw;
for (i = 0, was_ld_map = false; i < fp->len; i++) {
dst[i] = fp->insnsi[i];
if (!was_ld_map &&
@@ -177,12 +178,13 @@ void bpf_prog_calc_digest(struct bpf_prog *fp)
}
}
- psize = fp->len * sizeof(struct bpf_insn);
- memset(&raw[psize], 0, sizeof(raw) - psize);
+ psize = bpf_prog_insn_size(fp);
+ memset(&raw[psize], 0, raw_size - psize);
raw[psize++] = 0x80;
bsize = round_up(psize, SHA_MESSAGE_BYTES);
blocks = bsize / SHA_MESSAGE_BYTES;
+ todo = raw;
if (bsize - psize >= sizeof(__be64)) {
bits = (__be64 *)(todo + bsize - sizeof(__be64));
} else {
@@ -199,6 +201,9 @@ void bpf_prog_calc_digest(struct bpf_prog *fp)
result = (__force __be32 *)fp->digest;
for (i = 0; i < SHA_DIGEST_WORDS; i++)
result[i] = cpu_to_be32(fp->digest[i]);
+
+ vfree(raw);
+ return 0;
}
static bool bpf_is_jmp_and_has_target(const struct bpf_insn *insn)