diff options
| author |   Eric Dumazet <edumazet@google.com> | 2013-05-17 16:57:37 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-05-19 23:56:41 -0700 |
| commit | 164954454a4b1000eb022415654001cceb9259a7 (patch) | |
| tree | 3160f99d7714bd5dbff453bcec1b2d1d8987bf97 /include | |
| parent | x86: bpf_jit_comp: secure bpf jit against spraying attacks (diff) | |
| download | linux-dev-164954454a4b1000eb022415654001cceb9259a7.tar.xz linux-dev-164954454a4b1000eb022415654001cceb9259a7.zip | |
filter: do not output bpf image address for security reason
Do not leak starting address of BPF JIT code for non root users,
as it might help intruders to perform an attack.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filter.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index c050dcc322a4..56a6b7fbb3c6 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -58,10 +58,10 @@ extern void bpf_jit_free(struct sk_filter *fp); static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, u32 pass, void *image) { - pr_err("flen=%u proglen=%u pass=%u image=%p\n", + pr_err("flen=%u proglen=%u pass=%u image=%pK\n", flen, proglen, pass, image); if (image) - print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_ADDRESS, + print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, 16, 1, image, proglen, false); } #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns) |