Re: [PATCH] bpf: handle 32-bit zext during constant blinding

On 8/21/19 9:23 PM, Naveen N. Rao wrote: Since BPF constant blinding is performed after the verifier pass, the ALU32 instructions inserted for doubleword immediate loads don't have a corresponding zext instruction. This is causing a kernel oops on powerpc and can be reproduced by running 'test_cg

Re: [PATCH] bpf: handle 32-bit zext during constant blinding

Jiong Wang wrote: Naveen N. Rao writes: Since BPF constant blinding is performed after the verifier pass, the ALU32 instructions inserted for doubleword immediate loads don't have a corresponding zext instruction. This is causing a kernel oops on powerpc and can be reproduced by running 'test_

Re: [PATCH] bpf: handle 32-bit zext during constant blinding

Naveen N. Rao writes: > Since BPF constant blinding is performed after the verifier pass, the > ALU32 instructions inserted for doubleword immediate loads don't have a > corresponding zext instruction. This is causing a kernel oops on powerpc > and can be reproduced by running 'test_cgroup_stora

[PATCH] bpf: handle 32-bit zext during constant blinding

Since BPF constant blinding is performed after the verifier pass, the ALU32 instructions inserted for doubleword immediate loads don't have a corresponding zext instruction. This is causing a kernel oops on powerpc and can be reproduced by running 'test_cgroup_storage' with bpf_jit_harden=2. Fix t

Re: Regression fix for bpf in v5.3 (was Re: [RFC PATCH] bpf: handle 32-bit zext during constant blinding)

Jiong Wang wrote: Michael Ellerman writes: "Naveen N. Rao" writes: Since BPF constant blinding is performed after the verifier pass, there are certain ALU32 instructions inserted which don't have a corresponding zext instruction inserted after. This is causing a kernel oops on powerpc and ca

Re: Regression fix for bpf in v5.3 (was Re: [RFC PATCH] bpf: handle 32-bit zext during constant blinding)

Michael Ellerman writes: > "Naveen N. Rao" writes: >> Since BPF constant blinding is performed after the verifier pass, there >> are certain ALU32 instructions inserted which don't have a corresponding >> zext instruction inserted after. This is causing a kernel oops on >> powerpc and can be re

Re: [RFC PATCH] bpf: handle 32-bit zext during constant blinding

Naveen N. Rao writes: > Naveen N. Rao wrote: >> Since BPF constant blinding is performed after the verifier pass, there >> are certain ALU32 instructions inserted which don't have a corresponding >> zext instruction inserted after. This is causing a kernel oops on >> powerpc and can be reproduce

Regression fix for bpf in v5.3 (was Re: [RFC PATCH] bpf: handle 32-bit zext during constant blinding)

"Naveen N. Rao" writes: > Since BPF constant blinding is performed after the verifier pass, there > are certain ALU32 instructions inserted which don't have a corresponding > zext instruction inserted after. This is causing a kernel oops on > powerpc and can be reproduced by running 'test_cgroup_s

Re: [RFC PATCH] bpf: handle 32-bit zext during constant blinding

Naveen N. Rao wrote: Since BPF constant blinding is performed after the verifier pass, there are certain ALU32 instructions inserted which don't have a corresponding zext instruction inserted after. This is causing a kernel oops on powerpc and can be reproduced by running 'test_cgroup_storage' wi

[RFC PATCH] bpf: handle 32-bit zext during constant blinding

Since BPF constant blinding is performed after the verifier pass, there are certain ALU32 instructions inserted which don't have a corresponding zext instruction inserted after. This is causing a kernel oops on powerpc and can be reproduced by running 'test_cgroup_storage' with bpf_jit_harden=2. F