Re: [PATCH] perf build: Suppress openssl v3 deprecation warnings in libcrypto feature test

From: Arnaldo Carvalho de Melo
Date: Sun Jun 26 2022 - 11:18:53 EST

Em Sun, Jun 26, 2022 at 04:45:39PM +0200, Jiri Olsa escreveu:
> On Sat, Jun 25, 2022 at 11:34:38PM +0800, Zixuan Tan wrote:
> > With OpenSSL v3 installed, the libcrypto feature check fails as it use the
> > deprecated MD5_* API (and is compiled with -Werror). The error message is
> > as follows.
> >
> > $ make tools/perf
> > ```
> > Makefile.config:778: No libcrypto.h found, disables jitted code injection,
> > please install openssl-devel or libssl-dev
> >
> > Auto-detecting system features:
> > ... dwarf: [ on ]
> > ... dwarf_getlocations: [ on ]
> > ... glibc: [ on ]
> > ... libbfd: [ on ]
> > ... libbfd-buildid: [ on ]
> > ... libcap: [ on ]
> > ... libelf: [ on ]
> > ... libnuma: [ on ]
> > ... numa_num_possible_cpus: [ on ]
> > ... libperl: [ on ]
> > ... libpython: [ on ]
> > ... libcrypto: [ OFF ]
> > ... libunwind: [ on ]
> > ... libdw-dwarf-unwind: [ on ]
> > ... zlib: [ on ]
> > ... lzma: [ on ]
> > ... get_cpuid: [ on ]
> > ... bpf: [ on ]
> > ... libaio: [ on ]
> > ... libzstd: [ on ]
> > ... disassembler-four-args: [ on ]
> > ```
> >
> > This is very confusing because the suggested library (on my Ubuntu 20.04
> > it is libssl-dev) is already installed. As the test only checks for the
> > presence of libcrypto, this commit suppresses the deprecation warning to
> > allow the test to pass.
> >
> > Signed-off-by: Zixuan Tan <tanzixuan.me@xxxxxxxxx>
> > ---
> > tools/build/feature/test-libcrypto.c | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/tools/build/feature/test-libcrypto.c b/tools/build/feature/test-libcrypto.c
> > index a98174e0569c..31afff093d0b 100644
> > --- a/tools/build/feature/test-libcrypto.c
> > +++ b/tools/build/feature/test-libcrypto.c
> > @@ -2,6 +2,12 @@
> > #include <openssl/sha.h>
> > #include <openssl/md5.h>
> >
> > +/*
> > + * The MD5_* API have been deprecated since OpenSSL 3.0, which causes the
> > + * feature test to fail silently. This is a workaround.
> > + */
>
> then we use these deprecated MD5 calls in util/genelf.c if libcrypto is detected,
> so I wonder how come the rest of the compilation passed for you.. do you have
> CONFIG_JITDUMP disabled?

So, here, on fedora 36:

[acme@quaco perf-urgent]$ m
make: Entering directory '/home/acme/git/perf-urgent/tools/perf'
BUILD: Doing 'make -j8' parallel build
HOSTCC /tmp/build/perf-urgent/fixdep.o
HOSTLD /tmp/build/perf-urgent/fixdep-in.o
LINK /tmp/build/perf-urgent/fixdep
Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h'
diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
Warning: Kernel ABI header at 'tools/arch/x86/include/asm/disabled-features.h' differs from latest version at 'arch/x86/include/asm/disabled-features.h'
diff -u tools/arch/x86/include/asm/disabled-features.h arch/x86/include/asm/disabled-features.h
Warning: Kernel ABI header at 'tools/arch/arm64/include/uapi/asm/perf_regs.h' differs from latest version at 'arch/arm64/include/uapi/asm/perf_regs.h'
diff -u tools/arch/arm64/include/uapi/asm/perf_regs.h arch/arm64/include/uapi/asm/perf_regs.h
Warning: Kernel ABI header at 'tools/arch/x86/include/uapi/asm/svm.h' differs from latest version at 'arch/x86/include/uapi/asm/svm.h'
diff -u tools/arch/x86/include/uapi/asm/svm.h arch/x86/include/uapi/asm/svm.h
Warning: Kernel ABI header at 'tools/arch/arm64/include/uapi/asm/kvm.h' differs from latest version at 'arch/arm64/include/uapi/asm/kvm.h'
diff -u tools/arch/arm64/include/uapi/asm/kvm.h arch/arm64/include/uapi/asm/kvm.h
Warning: Kernel ABI header at 'tools/include/linux/coresight-pmu.h' differs from latest version at 'include/linux/coresight-pmu.h'
diff -u tools/include/linux/coresight-pmu.h include/linux/coresight-pmu.h
Makefile.config:778: No libcrypto.h found, disables jitted code injection, please install openssl-devel or libssl-dev
Makefile.config:1108: No openjdk development package found, please install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel

Auto-detecting system features:
... dwarf: [ on ]
... dwarf_getlocations: [ on ]
... glibc: [ on ]
... libbfd: [ on ]
... libbfd-buildid: [ on ]
... libcap: [ on ]
... libelf: [ on ]
... libnuma: [ on ]
... numa_num_possible_cpus: [ on ]
... libperl: [ on ]
... libpython: [ on ]
... libcrypto: [ OFF ] <-------------------------------------------------------
... libunwind: [ on ]
... libdw-dwarf-unwind: [ on ]
... zlib: [ on ]
... lzma: [ on ]
... get_cpuid: [ on ]
... bpf: [ on ]
... libaio: [ on ]
... libzstd: [ on ]
... disassembler-four-args: [ on ]


GEN /tmp/build/perf-urgent/common-cmds.h
MKDIR /tmp/build/perf-urgent/fd/
CC /tmp/build/perf-urgent/exec-cmd.o
CC /tmp/build/perf-urgent/fd/array.o


But then:

⬢[acme@toolbox perf-urgent]$ perf -vv
perf version 5.19.rc3.gfbec4d8dd3a7
dwarf: [ on ] # HAVE_DWARF_SUPPORT
dwarf_getlocations: [ on ] # HAVE_DWARF_GETLOCATIONS_SUPPORT
glibc: [ on ] # HAVE_GLIBC_SUPPORT
syscall_table: [ on ] # HAVE_SYSCALL_TABLE_SUPPORT
libbfd: [ on ] # HAVE_LIBBFD_SUPPORT
debuginfod: [ on ] # HAVE_DEBUGINFOD_SUPPORT
libelf: [ on ] # HAVE_LIBELF_SUPPORT
libnuma: [ on ] # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on ] # HAVE_LIBNUMA_SUPPORT
libperl: [ on ] # HAVE_LIBPERL_SUPPORT
libpython: [ on ] # HAVE_LIBPYTHON_SUPPORT
libslang: [ on ] # HAVE_SLANG_SUPPORT
libcrypto: [ OFF ] # HAVE_LIBCRYPTO_SUPPORT
libunwind: [ on ] # HAVE_LIBUNWIND_SUPPORT
libdw-dwarf-unwind: [ on ] # HAVE_DWARF_SUPPORT
zlib: [ on ] # HAVE_ZLIB_SUPPORT
lzma: [ on ] # HAVE_LZMA_SUPPORT
get_cpuid: [ on ] # HAVE_AUXTRACE_SUPPORT
bpf: [ on ] # HAVE_LIBBPF_SUPPORT
aio: [ on ] # HAVE_AIO_SUPPORT
zstd: [ on ] # HAVE_ZSTD_SUPPORT
libpfm4: [ OFF ] # HAVE_LIBPFM
⬢[acme@toolbox perf-urgent]$


But...:

⬢[acme@toolbox perf-urgent]$ ldd ~/bin/perf | grep ssl
libssl.so.3 => /lib64/libssl.so.3 (0x00007f02dc87e000)
⬢[acme@toolbox perf-urgent]$


- Arnaldo