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| author | Jann Horn <jannh@google.com> | 2017-12-18 20:11:54 -0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2017-12-21 02:15:41 +0100 |
| commit | 95a762e2c8c942780948091f8f2a4f32fce1ac6f (patch) | |
| tree | 12c21df5c872c87723ea4931c7bffa57c4c8616a /firmware | |
| parent | 4374f256ce8182019353c0c639bb8d0695b4c941 (diff) | |
| download | linux-95a762e2c8c942780948091f8f2a4f32fce1ac6f.tar.bz2 | |
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 <jannh@google.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'firmware')
0 files changed, 0 insertions, 0 deletions