Yonghong Song 332270fdc8 bpf: enhance verifier to understand stack pointer arithmetic ... llvm 4.0 and above generates the code like below: .... 440: (b7) r1 = 15 441: (05) goto pc+73 515: (79) r6 = *(u64 *)(r10 -152) 516: (bf) r7 = r10 517: (07) r7 += -112 518: (bf) r2 = r7 519: (0f) r2 += r1 520: (71) r1 = *(u8 *)(r8 +0) 521: (73) *(u8 *)(r2 +45) = r1 .... and the verifier complains "R2 invalid mem access 'inv'" for insn #521. This is because verifier marks register r2 as unknown value after #519 where r2 is a stack pointer and r1 holds a constant value. Teach verifier to recognize "stack_ptr + imm" and "stack_ptr + reg with const val" as valid stack_ptr with new offset. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-05-01 11:40:23 -04:00
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accounting
arch
build	bpf: Add sparc support to tools and samples.	2017-04-22 13:01:52 -07:00
cgroup
firewire
gpio
hv
iio
include	bpf: add napi_id read access to __sk_buff	2017-04-21 13:53:27 -04:00
kvm/kvm_stat
laptop
leds
lguest
lib	bpf: Add sparc support to tools and samples.	2017-04-22 13:01:52 -07:00
net
nfsd
objtool
pcmcia
perf
power
scripts
spi
testing	bpf: enhance verifier to understand stack pointer arithmetic	2017-05-01 11:40:23 -04:00
thermal/tmon
time
usb
virtio
vm
Makefile