Re: [PATCH bpf-next] bpf: Emit explicit NULL pointer checks for PROBE_LDX instructions.

Hello: This patch was applied to bpf/bpf-next.git (refs/heads/master): On Mon, 1 Feb 2021 21:38:37 -0800 you wrote: > From: Alexei Starovoitov > > PTR_TO_BTF_ID registers contain either kernel pointer or NULL. > Emit the NULL check explicitly by JIT instead of going into > do_user_addr_fault()

Re: [PATCH bpf-next] bpf: Emit explicit NULL pointer checks for PROBE_LDX instructions.

> On Feb 2, 2021, at 6:19 PM, Alexei Starovoitov > wrote: > > On Wed, Feb 03, 2021 at 12:56:39AM +, Song Liu wrote: >> >> >>> On Feb 1, 2021, at 9:38 PM, Alexei Starovoitov >>> wrote: >>> >>> From: Alexei Starovoitov >>> >>> PTR_TO_BTF_ID registers contain either kernel pointer or

Re: [PATCH bpf-next] bpf: Emit explicit NULL pointer checks for PROBE_LDX instructions.

On Wed, Feb 03, 2021 at 12:56:39AM +, Song Liu wrote: > > > > On Feb 1, 2021, at 9:38 PM, Alexei Starovoitov > > wrote: > > > > From: Alexei Starovoitov > > > > PTR_TO_BTF_ID registers contain either kernel pointer or NULL. > > Emit the NULL check explicitly by JIT instead of going into

Re: [PATCH bpf-next] bpf: Emit explicit NULL pointer checks for PROBE_LDX instructions.

> On Feb 1, 2021, at 9:38 PM, Alexei Starovoitov > wrote: > > From: Alexei Starovoitov > > PTR_TO_BTF_ID registers contain either kernel pointer or NULL. > Emit the NULL check explicitly by JIT instead of going into > do_user_addr_fault() on NULL deference. > > Signed-off-by: Alexei Starov

[PATCH bpf-next] bpf: Emit explicit NULL pointer checks for PROBE_LDX instructions.

From: Alexei Starovoitov PTR_TO_BTF_ID registers contain either kernel pointer or NULL. Emit the NULL check explicitly by JIT instead of going into do_user_addr_fault() on NULL deference. Signed-off-by: Alexei Starovoitov --- arch/x86/net/bpf_jit_comp.c | 19 +++ 1 file changed