Daniel Borkmann 5e581dad4f bpf: make unknown opcode handling more robust ... Recent findings by syzcaller fixed in 7891a87efc ("bpf: arsh is not supported in 32 bit alu thus reject it") triggered a warning in the interpreter due to unknown opcode not being rejected by the verifier. The 'return 0' for an unknown opcode is really not optimal, since with BPF to BPF calls, this would go untracked by the verifier. Do two things here to improve the situation: i) perform basic insn sanity check early on in the verification phase and reject every non-uapi insn right there. The bpf_opcode_in_insntable() table reuses the same mapping as the jumptable in ___bpf_prog_run() sans the non-public mappings. And ii) in ___bpf_prog_run() we do need to BUG in the case where the verifier would ever create an unknown opcode due to some rewrites. Note that JITs do not have such issues since they would punt to interpreter in these situations. Moreover, the BPF_JIT_ALWAYS_ON would also help to avoid such unknown opcodes in the first place. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-01-26 16:42:05 -08:00
..
acpi	Merge branch 'acpi-ec' into acpi	2017-11-30 13:37:29 +01:00
asm-generic	error-injection: Add injectable error types	2018-01-12 17:33:38 -08:00
clocksource
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-01-05 12:10:06 -08:00
drm	drm: rework delayed connector cleanup in connector_iter	2017-12-13 22:59:00 +01:00
dt-bindings	fixes/cleanups for rc1, non-desktop flags for VR	2017-11-23 21:04:56 -10:00
keys
kvm	KVM: arm/arm64: timer: Don't set irq as forwarded if no usable GIC	2017-12-18 10:53:23 +01:00
linux	bpf: make unknown opcode handling more robust	2018-01-26 16:42:05 -08:00
math-emu
media	media updates for v4.15-rc1	2017-11-15 20:30:12 -08:00
memory
misc
net	bpf: Support passing args to sock_ops bpf function	2018-01-25 16:41:14 -08:00
pcmcia
ras
rdma
scsi	scsi: libsas: align sata_device's rps_resp on a cacheline	2017-11-21 23:06:32 -05:00
soc	We have two changes to the core framework this time around. The first being a	2017-11-17 20:04:24 -08:00
sound	ALSA: hda - Fix yet remaining issue with vmaster 0dB initialization	2017-11-22 12:34:56 +01:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2017-11-24 19:19:20 -10:00
trace	net: tracepoint: exposing sk_faimily in tracepoint inet_sock_set_state	2018-01-08 14:32:45 -05:00
uapi	bpf: Add BPF_SOCK_OPS_STATE_CB	2018-01-25 16:41:15 -08:00
video	fbdev changes for v4.15:	2017-11-20 21:50:24 -10:00
xen	xen: fixes for 4.15-rc5	2017-12-22 12:30:10 -08:00