]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
bpf: don't let ldimm64 leak map addresses on unprivileged
authorDaniel Borkmann <daniel@iogearbox.net>
Sun, 7 May 2017 22:04:09 +0000 (00:04 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 8 May 2017 19:06:46 +0000 (15:06 -0400)
commit0d0e57697f162da4aa218b5feafe614fb666db07
tree454f20b91ec0c397d87ed016308a9d8da292980b
parent871ff2ebe0af0d7f1050bfc8bce62fddea2b12ec
bpf: don't let ldimm64 leak map addresses on unprivileged

The patch fixes two things at once:

1) It checks the env->allow_ptr_leaks and only prints the map address to
   the log if we have the privileges to do so, otherwise it just dumps 0
   as we would when kptr_restrict is enabled on %pK. Given the latter is
   off by default and not every distro sets it, I don't want to rely on
   this, hence the 0 by default for unprivileged.

2) Printing of ldimm64 in the verifier log is currently broken in that
   we don't print the full immediate, but only the 32 bit part of the
   first insn part for ldimm64. Thus, fix this up as well; it's okay to
   access, since we verified all ldimm64 earlier already (including just
   constants) through replace_map_fd_with_map_ptr().

Fixes: 1be7f75d1668 ("bpf: enable non-root eBPF programs")
Fixes: cbd357008604 ("bpf: verifier (add ability to receive verification log)")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
kernel/bpf/verifier.c