From 48b08be237ae2708d36abb50ca381eb90ce51f67 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Thu, 8 Dec 2016 11:28:53 -0800 Subject: Initial commit --- Makefile | 39 +++++++++++++++++++++++++++++ build-id.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ build-id.h | 45 +++++++++++++++++++++++++++++++++ build-id.lds | 11 ++++++++ so-test.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++ test.c | 61 ++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 301 insertions(+) create mode 100644 Makefile create mode 100644 build-id.c create mode 100644 build-id.h create mode 100644 build-id.lds create mode 100644 so-test.c create mode 100644 test.c diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..798da5b --- /dev/null +++ b/Makefile @@ -0,0 +1,39 @@ +# Copyright © 2016 Intel Corporation +# +# Permission is hereby granted, free of charge, to any person obtaining a +# copy of this software and associated documentation files (the "Software"), +# to deal in the Software without restriction, including without limitation +# the rights to use, copy, modify, merge, publish, distribute, sublicense, +# and/or sell copies of the Software, and to permit persons to whom the +# Software is furnished to do so, subject to the following conditions: +# +# The above copyright notice and this permission notice (including the next +# paragraph) shall be included in all copies or substantial portions of the +# Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +# IN THE SOFTWARE. + +LDFLAGS = -Wl,--build-id=sha1 -Wl,--default-script=build-id.lds + +all: build-id so-build-id + +build-id: test.o build-id.o + $(CC) $(LDFLAGS) $^ -o $@ + +so-build-id: so-test.o libbuild-id.so + $(CC) $(LDFLAGS) $^ -o $@ + +shared-build-id.o: build-id.c + $(CC) $(CPPFLAGS) $(CFLAGS) -fPIC -c $^ -o $@ + +libbuild-id.so: shared-build-id.o + $(CC) -Wl,-Bsymbolic $(LDFLAGS) -shared $^ -o $@ + +clean: + rm -f build-id so-build-id libbuild-id.so *.o diff --git a/build-id.c b/build-id.c new file mode 100644 index 0000000..94b2e5c --- /dev/null +++ b/build-id.c @@ -0,0 +1,82 @@ +/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include +#include +#include + +#include "build-id.h" + +extern const ElfW(Nhdr) __note_gnu_build_id_start[] __attribute__((weak)); +extern const ElfW(Nhdr) __note_gnu_build_id_end[] __attribute__((weak)); + +void +so_print(void) +{ + extern char etext, edata, end; + printf("Shared object:\n"); + printf(" program text (etext) %10p\n", &etext); + printf(" initialized data (edata) %10p\n", &edata); + printf(" uninitialized data (end) %10p\n", &end); + printf(" note section start %10p\n", __note_gnu_build_id_start); + printf(" note section end %10p\n", __note_gnu_build_id_end); +} + +const ElfW(Nhdr) * +build_id_find_nhdr(void) +{ + const ElfW(Nhdr) *nhdr = (void *)__note_gnu_build_id_start; + + if (__note_gnu_build_id_start >= __note_gnu_build_id_end) { + fprintf(stderr, "No .note section\n"); + return NULL; + } + + while (nhdr->n_type != NT_GNU_BUILD_ID) + { + nhdr = (ElfW(Nhdr) *) + ((intptr_t)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz + nhdr->n_descsz); + + if (nhdr >= __note_gnu_build_id_end) { + fprintf(stderr, "No .note.gnu.build-id section found\n"); + return NULL; + } + } + + return nhdr; +} + +ElfW(Word) +build_id_length(const ElfW(Nhdr) *nhdr) +{ + return nhdr->n_descsz; +} + +void +build_id_read(const ElfW(Nhdr) *nhdr, unsigned char *build_id) +{ + memcpy(build_id, + (unsigned char *)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz, + nhdr->n_descsz); +} diff --git a/build-id.h b/build-id.h new file mode 100644 index 0000000..7a51c1e --- /dev/null +++ b/build-id.h @@ -0,0 +1,45 @@ +/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include +#include +#include + +#if __x86_64__ +# define ElfW(type) Elf64_##type +#else +# define ElfW(type) Elf32_##type +#endif + +void +so_print(void); + +const ElfW(Nhdr) * +build_id_find_nhdr(void); + +ElfW(Word) +build_id_length(const ElfW(Nhdr) *nhdr); + +void +build_id_read(const ElfW(Nhdr) *nhdr, unsigned char *build_id); diff --git a/build-id.lds b/build-id.lds new file mode 100644 index 0000000..ae54f64 --- /dev/null +++ b/build-id.lds @@ -0,0 +1,11 @@ +SECTIONS +{ + __note_gnu_build_id_start = .; +} +INSERT BEFORE .note.gnu.build-id; + +SECTIONS +{ + __note_gnu_build_id_end = .; +} +INSERT AFTER .note.gnu.build-id; diff --git a/so-test.c b/so-test.c new file mode 100644 index 0000000..0c5d74a --- /dev/null +++ b/so-test.c @@ -0,0 +1,63 @@ +/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include +#include + +#include "build-id.h" + +int +main(int argc, char *argv[]) +{ + extern char etext, edata, end; + extern const char __note_gnu_build_id_end[] __attribute__((weak)); + extern const char __note_gnu_build_id_start[] __attribute__((weak)); + printf("Executable:\n"); + printf(" program text (etext) %10p\n", &etext); + printf(" initialized data (edata) %10p\n", &edata); + printf(" uninitialized data (end) %10p\n", &end); + printf(" note section start %10p\n", __note_gnu_build_id_start); + printf(" note section end %10p\n", __note_gnu_build_id_end); + + so_print(); + + const ElfW(Nhdr) *nhdr = build_id_find_nhdr(); + if (!nhdr) + return -1; + + ElfW(Word) len = build_id_length(nhdr); + + unsigned char *build_id = malloc(len * sizeof(char)); + if (!build_id) + return -1; + + build_id_read(nhdr, build_id); + + printf("Build ID: "); + for (ElfW(Word) i = 0; i < len; i++) { + printf("%02x", build_id[i]); + } + printf("\n"); + return 0; +} diff --git a/test.c b/test.c new file mode 100644 index 0000000..e8dae35 --- /dev/null +++ b/test.c @@ -0,0 +1,61 @@ +/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include +#include + +#include "build-id.h" + +int +main(int argc, char *argv[]) +{ + extern char etext, edata, end; + extern const char __note_gnu_build_id_end[] __attribute__((weak)); + extern const char __note_gnu_build_id_start[] __attribute__((weak)); + printf("Executable:\n"); + printf(" program text (etext) %10p\n", &etext); + printf(" initialized data (edata) %10p\n", &edata); + printf(" uninitialized data (end) %10p\n", &end); + printf(" note section start %10p\n", __note_gnu_build_id_start); + printf(" note section end %10p\n", __note_gnu_build_id_end); + + const ElfW(Nhdr) *nhdr = build_id_find_nhdr(); + if (!nhdr) + return -1; + + ElfW(Word) len = build_id_length(nhdr); + + unsigned char *build_id = malloc(len * sizeof(char)); + if (!build_id) + return -1; + + build_id_read(nhdr, build_id); + + printf("Build ID: "); + for (ElfW(Word) i = 0; i < len; i++) { + printf("%02x", build_id[i]); + } + printf("\n"); + return 0; +} -- cgit v1.2.3