From: Peter Zijlstra <peterz@infradead.org>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Song Liu <song@kernel.org>, Song Liu <songliubraving@meta.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
"David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Sami Tolvanen <samitolvanen@google.com>,
Kees Cook <keescook@chromium.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-riscv <linux-riscv@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
bpf <bpf@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
clang-built-linux <llvm@lists.linux.dev>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Joao Moreira <joao@overdrivepizza.com>,
Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v2 2/2] x86/cfi,bpf: Fix BPF JIT call
Date: Mon, 4 Dec 2023 12:11:28 +0100 [thread overview]
Message-ID: <20231204111128.GV8262@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20231204091334.GM3818@noisy.programming.kicks-ass.net>
On Mon, Dec 04, 2023 at 10:13:34AM +0100, Peter Zijlstra wrote:
> > Just running test_progs it splats right away:
> >
> > [ 74.047757] kmemleak: Found object by alias at 0xffffffffa0001d80
> > [ 74.048272] CPU: 14 PID: 104 Comm: kworker/14:0 Tainted: G W
> > O 6.7.0-rc3-00702-g41c30fec304d-dirty #5241
> > [ 74.049118] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> > [ 74.050042] Workqueue: events bpf_prog_free_deferred
> > [ 74.050448] Call Trace:
> > [ 74.050663] <TASK>
> > [ 74.050841] dump_stack_lvl+0x55/0x80
> > [ 74.051141] __find_and_remove_object+0xdb/0x110
> > [ 74.051521] kmemleak_free+0x41/0x70
> > [ 74.051828] vfree+0x36/0x130
>
> Durr, I'll see if I can get that stuff running locally, and otherwise
> play with the robot as you suggested. Thanks!
I think it is bpf_jit_binary_pack_hdr(), which is using prog->bpf_func
as a start address for the image, instead of jit_data->image.
This used to be true, but now it's offset.
Let me see what to do about that...
next prev parent reply other threads:[~2023-12-04 11:12 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-30 13:36 [PATCH v2 0/2] x86/bpf: Fix FineIBT vs eBPF Peter Zijlstra
2023-11-30 13:36 ` [PATCH v2 1/2] cfi: Flip headers Peter Zijlstra
2023-12-04 19:18 ` Sami Tolvanen
2023-11-30 13:36 ` [PATCH v2 2/2] x86/cfi,bpf: Fix BPF JIT call Peter Zijlstra
2023-12-03 22:56 ` Alexei Starovoitov
2023-12-04 9:13 ` Peter Zijlstra
2023-12-04 11:11 ` Peter Zijlstra [this message]
2023-12-04 12:52 ` Peter Zijlstra
2023-12-04 17:25 ` Jiri Olsa
2023-12-04 18:16 ` Peter Zijlstra
2023-12-04 18:33 ` Peter Zijlstra
2023-12-04 18:58 ` Sami Tolvanen
2023-12-05 1:18 ` Alexei Starovoitov
2023-12-06 15:35 ` Peter Zijlstra
2023-12-06 16:38 ` Peter Zijlstra
2023-12-06 18:37 ` Peter Zijlstra
2023-12-06 21:39 ` Alexei Starovoitov
2023-12-07 9:31 ` Peter Zijlstra
2023-12-07 22:32 ` Alexei Starovoitov
2023-12-08 10:29 ` Peter Zijlstra
2023-12-08 13:40 ` Peter Zijlstra
2023-12-08 17:21 ` Peter Zijlstra
2023-12-08 19:40 ` Alexei Starovoitov
2023-12-08 20:27 ` Peter Zijlstra
2023-12-08 20:35 ` Peter Zijlstra
2023-12-08 20:41 ` Alexei Starovoitov
2023-12-08 20:52 ` Peter Zijlstra
2023-12-08 20:58 ` Alexei Starovoitov
2023-12-08 22:45 ` Peter Zijlstra
2023-12-09 4:51 ` Alexei Starovoitov
2023-12-08 19:32 ` Alexei Starovoitov
2023-12-08 20:18 ` Peter Zijlstra
2023-12-08 20:45 ` Alexei Starovoitov
2023-12-08 20:56 ` Peter Zijlstra
2023-12-08 21:04 ` Alexei Starovoitov
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