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Message-ID: <CA+icZUV8P=rQh3M3h23Hhd+jAziOwtXj37LZ8FgdZE+SPz-p6A@mail.gmail.com> Date: Thu, 1 Aug 2019 11:35:45 +0200 From: Sedat Dilek <sedat.dilek@...il.com> To: Yonghong Song <yhs@...com>, Josh Poimboeuf <jpoimboe@...hat.com> Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin Lau <kafai@...com>, Song Liu <songliubraving@...com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>, Clang-Built-Linux ML <clang-built-linux@...glegroups.com>, Kees Cook <keescook@...omium.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Nathan Chancellor <natechancellor@...il.com> Subject: Re: next-20190723: bpf/seccomp - systemd/journald issue? On Thu, Aug 1, 2019 at 9:39 AM Sedat Dilek <sedat.dilek@...il.com> wrote: > > Hi, > > just want to let you know that I did a git bisect with Linux v5.3-rc2 > (where the problem also exists) and the result (details see [1]): > > e55a73251da335873a6e87d68fb17e5aabb8978e is the first bad commit > commit e55a73251da335873a6e87d68fb17e5aabb8978e > Author: Josh Poimboeuf <jpoimboe@...hat.com> > Date: Thu Jun 27 20:50:47 2019 -0500 > > bpf: Fix ORC unwinding in non-JIT BPF code > > Objtool previously ignored ___bpf_prog_run() because it didn't understand > the jump table. This resulted in the ORC unwinder not being able to unwind > through non-JIT BPF code. > > Now that objtool knows how to read jump tables, remove the whitelist and > annotate the jump table so objtool can recognize it. > > Also add an additional "const" to the jump table definition to clarify that > the text pointers are constant. Otherwise GCC sets the section writable > flag and the assembler spits out warnings. > > Fixes: d15d356887e7 ("perf/x86: Make perf callchains work without > CONFIG_FRAME_POINTER") > Reported-by: Song Liu <songliubraving@...com> > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com> > Signed-off-by: Thomas Gleixner <tglx@...utronix.de> > Acked-by: Alexei Starovoitov <ast@...nel.org> > Cc: Peter Zijlstra <peterz@...radead.org> > Cc: Kairui Song <kasong@...hat.com> > Cc: Steven Rostedt <rostedt@...dmis.org> > Cc: Borislav Petkov <bp@...en8.de> > Cc: Daniel Borkmann <daniel@...earbox.net> > Link: https://lkml.kernel.org/r/881939122b88f32be4c374d248c09d7527a87e35.1561685471.git.jpoimboe@redhat.com > Signed-off-by: Ingo Molnar <mingo@...nel.org> > > :040000 040000 4735e9d14fa416c1c361ec3923440a3d586a627d > 31de80b85c7b0292e47a719ecb6b1a451de2f8ef M kernel > > Maybe you want to look at this, too. > > The object files are attached in [2]. > > Thanks, > - Sedat - > > [0] https://github.com/ClangBuiltLinux/linux/issues/619 > [1] https://github.com/ClangBuiltLinux/linux/issues/619#issuecomment-517152467 > [2] https://github.com/ClangBuiltLinux/linux/issues/619#issuecomment-517159635 After reverting above commit I can boot into Linux v5.3-rc2 built with clang-9.0.0-rc1 and lld with no issues. - Sedat -
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