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Merge pull request #964 from rneugeba/ebpf

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Fix a few eBPF things
This commit is contained in:
Justin Cormack 2017-01-06 19:03:16 +00:00 committed by GitHub
commit 431a60746d
4 changed files with 21 additions and 4 deletions
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6
alpine/base/ebpf/Dockerfile
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@ -6,7 +6,7 @@ COPY cdefs.h /usr/include/sys/
ADD kernel-headers.tar /
ADD kernel-dev.tar /
ADD kernel-modules.tar /
ADD 100-musl-compat.patch decl.patch intl.patch bcc-gnuism.patch ./
ADD 100-musl-compat.patch decl.patch intl.patch bcc-gnuism.patch bcc-stack-protector.patch ./
RUN cat elfutils-$ELFUTILS_VERSION.tar.bz2 | tar xjf -
RUN cd elfutils-$ELFUTILS_VERSION && \
patch -p1 < ../100-musl-compat.patch && \
@ -15,9 +15,11 @@ RUN cd elfutils-$ELFUTILS_VERSION && \
automake && \
./configure --prefix=/usr CFLAGS=-Wno-strict-aliasing && \
make -C libelf && make -C libelf install
RUN cd bcc && patch -p0 < ../bcc-gnuism.patch
RUN cd bcc && patch -p0 < ../bcc-gnuism.patch && patch -p0 < ../bcc-stack-protector.patch
RUN mkdir -p bcc/build && cd bcc/build && \
cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DLUAJIT_INCLUDE_DIR=/usr/include/luajit-2.1 && \
make && \
make install
RUN mkdir -p /usr/local/share/lua/5.1/ && cd ljsyscall && cp -a *.lua syscall /usr/local/share/lua/5.1/
ENV LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib64

2
alpine/base/ebpf/Makefile
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@ -2,7 +2,7 @@ KERNEL_FILES=-C ../../kernel/x86_64 kernel-headers.tar kernel-dev.tar kernel-mod
default: ebpf.tag
ebpf.tag: Dockerfile 100-musl-compat.patch bcc-gnuism.patch decl.patch intl.patch temp_failure.patch cdefs.h error.h
ebpf.tag: Dockerfile 100-musl-compat.patch bcc-gnuism.patch bcc-stack-protector.patch decl.patch intl.patch temp_failure.patch cdefs.h error.h
BUILD=$$( tar cf - $^ $(KERNEL_FILES) | docker build -q - ) && [ -n "$$BUILD" ] && echo "Built $$BUILD" && \
echo $$BUILD > $@

10
alpine/base/ebpf/bcc-stack-protector.patch Normal file
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@ -0,0 +1,10 @@
--- src/cc/frontends/clang/kbuild_helper.cc
+++ src/cc/frontends/clang/kbuild_helper.cc
@@ -89,6 +89,7 @@ int KBuildHelper::get_flags(const char *uname_machine, vector<string> *cflags) {
cflags->push_back("-D__HAVE_BUILTIN_BSWAP64__");
cflags->push_back("-Wno-unused-value");
cflags->push_back("-Wno-pointer-sign");
+ cflags->push_back("-fno-stack-protector");
return 0;
}

7
docs/ebpf.md
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@ -11,7 +11,12 @@ benchmarks etc.
You probably want to run with
`docker run -it -v /sys/kernel/debug:/sys/kernel/debug --privileged mobylinux/ebpf:tag sh` for
`docker run -it -v /sys/kernel/debug:/sys/kernel/debug --privileged --pid=host mobylinux/ebpf:tag sh` for
interactive use as some things use debugfs. You need at least `CAP_SYS_ADMIN` to do anything.
There are examples in `bcc/examples` that should generally just work, I have tried several of
the Lua ones.
Some of the `iovisor/bcc` samples try to access the kernel symbols. For them to work correctly you should also execute:
```sh
echo 0 > /proc/sys/kernel/kptr_restrict
```