diff options
| author | Jann Horn <[email protected]> | 2017-12-18 20:11:54 -0800 |
|---|---|---|
| committer | Daniel Borkmann <[email protected]> | 2017-12-21 02:15:41 +0100 |
| commit | 95a762e2c8c942780948091f8f2a4f32fce1ac6f (patch) | |
| tree | 12c21df5c872c87723ea4931c7bffa57c4c8616a /net/unix/sysctl_net_unix.c | |
| parent | 4374f256ce8182019353c0c639bb8d0695b4c941 (diff) | |
bpf: fix incorrect sign extension in check_alu_op()
Distinguish between
BPF_ALU64|BPF_MOV|BPF_K (load 32-bit immediate, sign-extended to 64-bit)
and BPF_ALU|BPF_MOV|BPF_K (load 32-bit immediate, zero-padded to 64-bit);
only perform sign extension in the first case.
Starting with v4.14, this is exploitable by unprivileged users as long as
the unprivileged_bpf_disabled sysctl isn't set.
Debian assigned CVE-2017-16995 for this issue.
v3:
- add CVE number (Ben Hutchings)
Fixes: 484611357c19 ("bpf: allow access into map value arrays")
Signed-off-by: Jann Horn <[email protected]>
Acked-by: Edward Cree <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Diffstat (limited to 'net/unix/sysctl_net_unix.c')
0 files changed, 0 insertions, 0 deletions