Message ID | 20220118215731.1320930-3-hjl.tools@gmail.com |
---|---|
State | New |
Headers | show |
Series | Properly align all PT_LOAD segments with tests | expand |
On 18/01/2022 18:57, H.J. Lu wrote: > Add tst-p_alignmod1-edit to edit the copy of tst-p_alignmod-base.so to > reduce p_align of the first PT_LOAD segment by half and verify that the > shared library is mapped with the maximum p_align of all PT_LOAD segments. > --- > elf/Makefile | 16 +++++ > elf/tst-elf-edit.h | 126 +++++++++++++++++++++++++++++++++++++ > elf/tst-p_align.h | 20 ++++++ > elf/tst-p_align1.c | 27 ++++++++ > elf/tst-p_alignmod-base.c | 41 ++++++++++++ > elf/tst-p_alignmod1-edit.c | 34 ++++++++++ > 6 files changed, 264 insertions(+) > create mode 100644 elf/tst-elf-edit.h > create mode 100644 elf/tst-p_align.h > create mode 100644 elf/tst-p_align1.c > create mode 100644 elf/tst-p_alignmod-base.c > create mode 100644 elf/tst-p_alignmod1-edit.c > > diff --git a/elf/Makefile b/elf/Makefile > index 692a65b061..94ebcab1fa 100644 > --- a/elf/Makefile > +++ b/elf/Makefile > @@ -412,6 +412,8 @@ tests += \ > tst-nodelete-opened \ > tst-noload \ > tst-null-argv \ > + tst-p_alignmod1-edit \ > + tst-p_align1 \ > tst-relsort1 \ > tst-ro-dynamic \ > tst-rtld-run-static \ > @@ -728,6 +730,7 @@ modules-names = \ > tst-nodelete-dlclose-plugin \ > tst-nodelete-opened-lib \ > tst-null-argv-lib \ > + tst-p_alignmod-base \ > tst-relsort1mod1 \ > tst-relsort1mod2 \ > tst-ro-dynamic-mod \ > @@ -2578,3 +2581,16 @@ CFLAGS-tst-dl_find_object-mod6.c += -funwind-tables > CFLAGS-tst-dl_find_object-mod7.c += -funwind-tables > CFLAGS-tst-dl_find_object-mod8.c += -funwind-tables > CFLAGS-tst-dl_find_object-mod9.c += -funwind-tables > + > +$(objpfx)tst-p_alignmod-base.so: $(libsupport) > + > +$(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so > + > +# Make a copy of tst-p_alignmod-base.so and lower p_align of the first > +# PT_LOAD segment. > +$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod1-edit \ > + $(objpfx)tst-p_alignmod-base.so > + rm -f $@ > + cp $(objpfx)tst-p_alignmod-base.so $@ > + $(test-wrapper-env) $(run-program-env) $(rtld-prefix) \ > + $(objpfx)tst-p_alignmod1-edit $@ > diff --git a/elf/tst-elf-edit.h b/elf/tst-elf-edit.h > new file mode 100644 > index 0000000000..b764e78933 > --- /dev/null > +++ b/elf/tst-elf-edit.h > @@ -0,0 +1,126 @@ > +/* Update p_align of the first PT_LOAD segment. > + Copyright (C) 2022 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + <https://www.gnu.org/licenses/>. */ > + > +#include <stdio.h> > +#include <stdbool.h> > +#include <unistd.h> > +#include <fcntl.h> > +#include <link.h> > +#include <error.h> > +#include <errno.h> > +#include <sys/stat.h> > +#include <sys/mman.h> > + > +const char *file_name; > + > +static size_t update_p_align (size_t); > + > +int > +main (int argc, char ** argv) > +{ > + if (argc != 2) > + { > + printf ("Usage: %s: file\n", argv[0]); > + return 0; > + } > + > + file_name = argv[1]; > + struct stat statbuf; > + int errno_saved; > + > + if (stat (file_name, &statbuf) < 0) > + error (1, errno, "%s: not exist", file_name); > + > + ElfW(Ehdr) *ehdr; > + > + if (statbuf.st_size < sizeof (*ehdr)) > + error (1, 0, "%s: too small", file_name); > + > + int fd = open (file_name, O_RDWR); > + if (fd < 0) > + error (1, errno, "%s: can't open", file_name); > + > + /* Map in the whole file. */ > + void *base = mmap (NULL, statbuf.st_size, PROT_READ | PROT_WRITE, > + MAP_SHARED, fd, 0); > + if (base == MAP_FAILED) > + { > + errno_saved = errno; > + close (fd); > + error (1, errno_saved, "%s: failed to map", file_name); > + } > + > + ehdr = (ElfW(Ehdr) *) base; > + if (ehdr->e_ident[EI_MAG0] != ELFMAG0 > + || ehdr->e_ident[EI_MAG1] != ELFMAG1 > + || ehdr->e_ident[EI_MAG2] != ELFMAG2 > + || ehdr->e_ident[EI_MAG3] != ELFMAG3) > + { > + close (fd); > + error (1, 0, "%s: bad ELF header", file_name); > + } > + > + if (ehdr->e_type != ET_DYN) > + { > + close (fd); > + error (1, 0, "%s: not shared library", file_name); > + } > + > + bool unsupported_class = true; > + switch (ehdr->e_ident[EI_CLASS]) > + { > + default: > + break; > + > + case ELFCLASS32: > + unsupported_class = __ELF_NATIVE_CLASS != 32; > + break; > + > + case ELFCLASS64: > + unsupported_class = __ELF_NATIVE_CLASS != 64; > + break; > + } > + > + if (unsupported_class) > + { > + close (fd); > + error (1, 0, "%s: unsupported ELF class: %d", > + file_name, ehdr->e_ident[EI_CLASS]); > + } > + > + size_t phdr_size = sizeof (ElfW(Phdr)) * ehdr->e_phentsize; > + if (statbuf.st_size < (ehdr->e_phoff + phdr_size)) > + { > + close (fd); > + error (1, 0, "%s: too small", file_name); > + } > + > + ElfW(Phdr) *phdr = (ElfW(Phdr) *) (base + ehdr->e_phoff); > + for (int i = 0; i < ehdr->e_phnum; i++, phdr++) > + if (phdr->p_type == PT_LOAD) > + { > + /* Update p_align of the first PT_LOAD segment. */ > + phdr->p_align = update_p_align (phdr->p_align); > + break; > + } > + > + munmap (base, statbuf.st_size); > + close (fd); > + > + return 0; > +} > diff --git a/elf/tst-p_align.h b/elf/tst-p_align.h > new file mode 100644 > index 0000000000..cef92330fb > --- /dev/null > +++ b/elf/tst-p_align.h > @@ -0,0 +1,20 @@ > +/* Prototypes to check different alignments of PT_LOAD segments in > + a shared library. > + Copyright (C) 2022 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + <https://www.gnu.org/licenses/>. */ > + > +extern int do_load_test (void); > diff --git a/elf/tst-p_align1.c b/elf/tst-p_align1.c > new file mode 100644 > index 0000000000..961c7fbbf1 > --- /dev/null > +++ b/elf/tst-p_align1.c > @@ -0,0 +1,27 @@ > +/* Check different alignments of PT_LOAD segments in a shared library. > + Copyright (C) 2022 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + <https://www.gnu.org/licenses/>. */ > + > +#include "tst-p_align.h" > + > +static int > +do_test (void) > +{ > + return do_load_test (); > +} > + > +#include <support/test-driver.c> I am seeing a failure with GNU ld (GNU Binutils) 2.37.20220112: $ make test t=elf/tst-p_align1 [...] FAIL: elf/tst-p_align1 original exit status 1 foo: 0x7fdddbecb000 error: tst-p_alignmod-base.c:39: not true: is_aligned_p (&foo, ALIGN) error: 1 test failures Without -Wl,-z,max-page-size=0x200000 the tst-p_alignmod-base.so is still 0x1000: $ readelf -l elf/tst-p_alignmod-base.so [...] Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000998 0x0000000000000998 R 0x1000 LOAD 0x0000000000001000 0x0000000000001000 0x0000000000001000 0x0000000000000589 0x0000000000000589 R E 0x1000 LOAD 0x0000000000002000 0x0000000000002000 0x0000000000002000 0x00000000000003f8 0x00000000000003f8 R 0x1000 LOAD 0x0000000000002df0 0x0000000000003df0 0x0000000000003df0 0x0000000000000288 0x0000000000000288 RW 0x1000 LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 0x0000000000200004 0x0000000000200018 RW 0x1000 [...] I think you will need to use the same strategy from tst-align3 to force the maximum alignment: diff --git a/elf/Makefile b/elf/Makefile index 94ebcab1fa..cdb41c686e 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -2583,6 +2583,7 @@ CFLAGS-tst-dl_find_object-mod8.c += -funwind-tables CFLAGS-tst-dl_find_object-mod9.c += -funwind-tables $(objpfx)tst-p_alignmod-base.so: $(libsupport) +LDFLAGS-tst-p_alignmod-base.so += -Wl,-z,max-page-size=0x200000 $(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so diff --git a/elf/tst-p_alignmod1-edit.c b/elf/tst-p_alignmod1-edit.c index cdb453e696..06d9c636fd 100644 --- a/elf/tst-p_alignmod1-edit.c +++ b/elf/tst-p_alignmod1-edit.c @@ -23,12 +23,5 @@ static size_t update_p_align (size_t p_align) { - size_t pagesize = sysconf (_SC_PAGESIZE); - size_t new_p_align = p_align >> 1; - - if (new_p_align >= pagesize) - error (1, 0, "%s: new p_align (0x%zx) >= page size (0x%zx)", - file_name, new_p_align, pagesize); - - return new_p_align; + return p_align >> 1; } The rest looks ok. > diff --git a/elf/tst-p_alignmod-base.c b/elf/tst-p_alignmod-base.c > new file mode 100644 > index 0000000000..0fc1b75523 > --- /dev/null > +++ b/elf/tst-p_alignmod-base.c > @@ -0,0 +1,41 @@ > +/* Check alignment of PT_LOAD segment in a shared library. > + Copyright (C) 2022 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + <https://www.gnu.org/licenses/>. */ > + > +#include <stdio.h> > +#include <stdbool.h> > +#include <stdint.h> > +#include <support/check.h> > +#include <tst-file-align.h> > +#include "tst-p_align.h" > + > +int foo __attribute__ ((aligned (ALIGN))) = 1; > + > +bool > +__attribute__ ((weak, noclone, noinline)) > +is_aligned_p (void *p, int align) > +{ > + return (((uintptr_t) p) & (align - 1)) == 0; > +} > + > +int > +do_load_test (void) > +{ > + printf ("foo: %p\n", &foo); > + TEST_VERIFY (is_aligned_p (&foo, ALIGN)); > + return 0; > +} > diff --git a/elf/tst-p_alignmod1-edit.c b/elf/tst-p_alignmod1-edit.c > new file mode 100644 > index 0000000000..cdb453e696 > --- /dev/null > +++ b/elf/tst-p_alignmod1-edit.c > @@ -0,0 +1,34 @@ > +/* Reduce p_align of the first PT_LOAD segment by half. > + Copyright (C) 2022 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + <https://www.gnu.org/licenses/>. */ > + > +#include "tst-elf-edit.h" > + > +/* Reduce p_align by half. */ > + > +static size_t > +update_p_align (size_t p_align) > +{ > + size_t pagesize = sysconf (_SC_PAGESIZE); > + size_t new_p_align = p_align >> 1; > + > + if (new_p_align >= pagesize) > + error (1, 0, "%s: new p_align (0x%zx) >= page size (0x%zx)", > + file_name, new_p_align, pagesize); > + > + return new_p_align; > +}
On Fri, Jan 21, 2022 at 12:00 PM Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote: > On 18/01/2022 18:57, H.J. Lu wrote: > > Add tst-p_alignmod1-edit to edit the copy of tst-p_alignmod-base.so to > > reduce p_align of the first PT_LOAD segment by half and verify that the > > shared library is mapped with the maximum p_align of all PT_LOAD segments. > > --- > > elf/Makefile | 16 +++++ > > elf/tst-elf-edit.h | 126 +++++++++++++++++++++++++++++++++++++ > > elf/tst-p_align.h | 20 ++++++ > > elf/tst-p_align1.c | 27 ++++++++ > > elf/tst-p_alignmod-base.c | 41 ++++++++++++ > > elf/tst-p_alignmod1-edit.c | 34 ++++++++++ > > 6 files changed, 264 insertions(+) > > create mode 100644 elf/tst-elf-edit.h > > create mode 100644 elf/tst-p_align.h > > create mode 100644 elf/tst-p_align1.c > > create mode 100644 elf/tst-p_alignmod-base.c > > create mode 100644 elf/tst-p_alignmod1-edit.c > > > > diff --git a/elf/Makefile b/elf/Makefile > > index 692a65b061..94ebcab1fa 100644 > > --- a/elf/Makefile > > +++ b/elf/Makefile > > @@ -412,6 +412,8 @@ tests += \ > > tst-nodelete-opened \ > > tst-noload \ > > tst-null-argv \ > > + tst-p_alignmod1-edit \ > > + tst-p_align1 \ > > tst-relsort1 \ > > tst-ro-dynamic \ > > tst-rtld-run-static \ > > @@ -728,6 +730,7 @@ modules-names = \ > > tst-nodelete-dlclose-plugin \ > > tst-nodelete-opened-lib \ > > tst-null-argv-lib \ > > + tst-p_alignmod-base \ > > tst-relsort1mod1 \ > > tst-relsort1mod2 \ > > tst-ro-dynamic-mod \ > > @@ -2578,3 +2581,16 @@ CFLAGS-tst-dl_find_object-mod6.c += -funwind-tables > > CFLAGS-tst-dl_find_object-mod7.c += -funwind-tables > > CFLAGS-tst-dl_find_object-mod8.c += -funwind-tables > > CFLAGS-tst-dl_find_object-mod9.c += -funwind-tables > > + > > +$(objpfx)tst-p_alignmod-base.so: $(libsupport) > > + > > +$(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so > > + > > +# Make a copy of tst-p_alignmod-base.so and lower p_align of the first > > +# PT_LOAD segment. > > +$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod1-edit \ > > + $(objpfx)tst-p_alignmod-base.so > > + rm -f $@ > > + cp $(objpfx)tst-p_alignmod-base.so $@ > > + $(test-wrapper-env) $(run-program-env) $(rtld-prefix) \ > > + $(objpfx)tst-p_alignmod1-edit $@ > > diff --git a/elf/tst-elf-edit.h b/elf/tst-elf-edit.h > > new file mode 100644 > > index 0000000000..b764e78933 > > --- /dev/null > > +++ b/elf/tst-elf-edit.h > > @@ -0,0 +1,126 @@ > > +/* Update p_align of the first PT_LOAD segment. > > + Copyright (C) 2022 Free Software Foundation, Inc. > > + This file is part of the GNU C Library. > > + > > + The GNU C Library is free software; you can redistribute it and/or > > + modify it under the terms of the GNU Lesser General Public > > + License as published by the Free Software Foundation; either > > + version 2.1 of the License, or (at your option) any later version. > > + > > + The GNU C Library is distributed in the hope that it will be useful, > > + but WITHOUT ANY WARRANTY; without even the implied warranty of > > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + Lesser General Public License for more details. > > + > > + You should have received a copy of the GNU Lesser General Public > > + License along with the GNU C Library; if not, see > > + <https://www.gnu.org/licenses/>. */ > > + > > +#include <stdio.h> > > +#include <stdbool.h> > > +#include <unistd.h> > > +#include <fcntl.h> > > +#include <link.h> > > +#include <error.h> > > +#include <errno.h> > > +#include <sys/stat.h> > > +#include <sys/mman.h> > > + > > +const char *file_name; > > + > > +static size_t update_p_align (size_t); > > + > > +int > > +main (int argc, char ** argv) > > +{ > > + if (argc != 2) > > + { > > + printf ("Usage: %s: file\n", argv[0]); > > + return 0; > > + } > > + > > + file_name = argv[1]; > > + struct stat statbuf; > > + int errno_saved; > > + > > + if (stat (file_name, &statbuf) < 0) > > + error (1, errno, "%s: not exist", file_name); > > + > > + ElfW(Ehdr) *ehdr; > > + > > + if (statbuf.st_size < sizeof (*ehdr)) > > + error (1, 0, "%s: too small", file_name); > > + > > + int fd = open (file_name, O_RDWR); > > + if (fd < 0) > > + error (1, errno, "%s: can't open", file_name); > > + > > + /* Map in the whole file. */ > > + void *base = mmap (NULL, statbuf.st_size, PROT_READ | PROT_WRITE, > > + MAP_SHARED, fd, 0); > > + if (base == MAP_FAILED) > > + { > > + errno_saved = errno; > > + close (fd); > > + error (1, errno_saved, "%s: failed to map", file_name); > > + } > > + > > + ehdr = (ElfW(Ehdr) *) base; > > + if (ehdr->e_ident[EI_MAG0] != ELFMAG0 > > + || ehdr->e_ident[EI_MAG1] != ELFMAG1 > > + || ehdr->e_ident[EI_MAG2] != ELFMAG2 > > + || ehdr->e_ident[EI_MAG3] != ELFMAG3) > > + { > > + close (fd); > > + error (1, 0, "%s: bad ELF header", file_name); > > + } > > + > > + if (ehdr->e_type != ET_DYN) > > + { > > + close (fd); > > + error (1, 0, "%s: not shared library", file_name); > > + } > > + > > + bool unsupported_class = true; > > + switch (ehdr->e_ident[EI_CLASS]) > > + { > > + default: > > + break; > > + > > + case ELFCLASS32: > > + unsupported_class = __ELF_NATIVE_CLASS != 32; > > + break; > > + > > + case ELFCLASS64: > > + unsupported_class = __ELF_NATIVE_CLASS != 64; > > + break; > > + } > > + > > + if (unsupported_class) > > + { > > + close (fd); > > + error (1, 0, "%s: unsupported ELF class: %d", > > + file_name, ehdr->e_ident[EI_CLASS]); > > + } > > + > > + size_t phdr_size = sizeof (ElfW(Phdr)) * ehdr->e_phentsize; > > + if (statbuf.st_size < (ehdr->e_phoff + phdr_size)) > > + { > > + close (fd); > > + error (1, 0, "%s: too small", file_name); > > + } > > + > > + ElfW(Phdr) *phdr = (ElfW(Phdr) *) (base + ehdr->e_phoff); > > + for (int i = 0; i < ehdr->e_phnum; i++, phdr++) > > + if (phdr->p_type == PT_LOAD) > > + { > > + /* Update p_align of the first PT_LOAD segment. */ > > + phdr->p_align = update_p_align (phdr->p_align); > > + break; > > + } > > + > > + munmap (base, statbuf.st_size); > > + close (fd); > > + > > + return 0; > > +} > > diff --git a/elf/tst-p_align.h b/elf/tst-p_align.h > > new file mode 100644 > > index 0000000000..cef92330fb > > --- /dev/null > > +++ b/elf/tst-p_align.h > > @@ -0,0 +1,20 @@ > > +/* Prototypes to check different alignments of PT_LOAD segments in > > + a shared library. > > + Copyright (C) 2022 Free Software Foundation, Inc. > > + This file is part of the GNU C Library. > > + > > + The GNU C Library is free software; you can redistribute it and/or > > + modify it under the terms of the GNU Lesser General Public > > + License as published by the Free Software Foundation; either > > + version 2.1 of the License, or (at your option) any later version. > > + > > + The GNU C Library is distributed in the hope that it will be useful, > > + but WITHOUT ANY WARRANTY; without even the implied warranty of > > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + Lesser General Public License for more details. > > + > > + You should have received a copy of the GNU Lesser General Public > > + License along with the GNU C Library; if not, see > > + <https://www.gnu.org/licenses/>. */ > > + > > +extern int do_load_test (void); > > diff --git a/elf/tst-p_align1.c b/elf/tst-p_align1.c > > new file mode 100644 > > index 0000000000..961c7fbbf1 > > --- /dev/null > > +++ b/elf/tst-p_align1.c > > @@ -0,0 +1,27 @@ > > +/* Check different alignments of PT_LOAD segments in a shared library. > > + Copyright (C) 2022 Free Software Foundation, Inc. > > + This file is part of the GNU C Library. > > + > > + The GNU C Library is free software; you can redistribute it and/or > > + modify it under the terms of the GNU Lesser General Public > > + License as published by the Free Software Foundation; either > > + version 2.1 of the License, or (at your option) any later version. > > + > > + The GNU C Library is distributed in the hope that it will be useful, > > + but WITHOUT ANY WARRANTY; without even the implied warranty of > > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + Lesser General Public License for more details. > > + > > + You should have received a copy of the GNU Lesser General Public > > + License along with the GNU C Library; if not, see > > + <https://www.gnu.org/licenses/>. */ > > + > > +#include "tst-p_align.h" > > + > > +static int > > +do_test (void) > > +{ > > + return do_load_test (); > > +} > > + > > +#include <support/test-driver.c> > > I am seeing a failure with GNU ld (GNU Binutils) 2.37.20220112: > > $ make test t=elf/tst-p_align1 > [...] > FAIL: elf/tst-p_align1 > original exit status 1 > foo: 0x7fdddbecb000 > error: tst-p_alignmod-base.c:39: not true: is_aligned_p (&foo, ALIGN) > error: 1 test failures > > Without -Wl,-z,max-page-size=0x200000 the tst-p_alignmod-base.so is still > 0x1000: > > $ readelf -l elf/tst-p_alignmod-base.so > [...] > Program Headers: > Type Offset VirtAddr PhysAddr > FileSiz MemSiz Flags Align > LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000 > 0x0000000000000998 0x0000000000000998 R 0x1000 > LOAD 0x0000000000001000 0x0000000000001000 0x0000000000001000 > 0x0000000000000589 0x0000000000000589 R E 0x1000 > LOAD 0x0000000000002000 0x0000000000002000 0x0000000000002000 > 0x00000000000003f8 0x00000000000003f8 R 0x1000 > LOAD 0x0000000000002df0 0x0000000000003df0 0x0000000000003df0 > 0x0000000000000288 0x0000000000000288 RW 0x1000 > LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 > 0x0000000000200004 0x0000000000200018 RW 0x1000 > [...] > > I think you will need to use the same strategy from tst-align3 to force the > maximum alignment: > > diff --git a/elf/Makefile b/elf/Makefile > index 94ebcab1fa..cdb41c686e 100644 > --- a/elf/Makefile > +++ b/elf/Makefile > @@ -2583,6 +2583,7 @@ CFLAGS-tst-dl_find_object-mod8.c += -funwind-tables > CFLAGS-tst-dl_find_object-mod9.c += -funwind-tables > > $(objpfx)tst-p_alignmod-base.so: $(libsupport) > +LDFLAGS-tst-p_alignmod-base.so += -Wl,-z,max-page-size=0x200000 Fixed. > $(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so > > diff --git a/elf/tst-p_alignmod1-edit.c b/elf/tst-p_alignmod1-edit.c > index cdb453e696..06d9c636fd 100644 > --- a/elf/tst-p_alignmod1-edit.c > +++ b/elf/tst-p_alignmod1-edit.c > @@ -23,12 +23,5 @@ > static size_t > update_p_align (size_t p_align) > { > - size_t pagesize = sysconf (_SC_PAGESIZE); > - size_t new_p_align = p_align >> 1; > - > - if (new_p_align >= pagesize) > - error (1, 0, "%s: new p_align (0x%zx) >= page size (0x%zx)", > - file_name, new_p_align, pagesize); > - > - return new_p_align; > + return p_align >> 1; > } Fixed. I sent out the v9 patch. > The rest looks ok. > > > diff --git a/elf/tst-p_alignmod-base.c b/elf/tst-p_alignmod-base.c > > new file mode 100644 > > index 0000000000..0fc1b75523 > > --- /dev/null > > +++ b/elf/tst-p_alignmod-base.c > > @@ -0,0 +1,41 @@ > > +/* Check alignment of PT_LOAD segment in a shared library. > > + Copyright (C) 2022 Free Software Foundation, Inc. > > + This file is part of the GNU C Library. > > + > > + The GNU C Library is free software; you can redistribute it and/or > > + modify it under the terms of the GNU Lesser General Public > > + License as published by the Free Software Foundation; either > > + version 2.1 of the License, or (at your option) any later version. > > + > > + The GNU C Library is distributed in the hope that it will be useful, > > + but WITHOUT ANY WARRANTY; without even the implied warranty of > > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + Lesser General Public License for more details. > > + > > + You should have received a copy of the GNU Lesser General Public > > + License along with the GNU C Library; if not, see > > + <https://www.gnu.org/licenses/>. */ > > + > > +#include <stdio.h> > > +#include <stdbool.h> > > +#include <stdint.h> > > +#include <support/check.h> > > +#include <tst-file-align.h> > > +#include "tst-p_align.h" > > + > > +int foo __attribute__ ((aligned (ALIGN))) = 1; > > + > > +bool > > +__attribute__ ((weak, noclone, noinline)) > > +is_aligned_p (void *p, int align) > > +{ > > + return (((uintptr_t) p) & (align - 1)) == 0; > > +} > > + > > +int > > +do_load_test (void) > > +{ > > + printf ("foo: %p\n", &foo); > > + TEST_VERIFY (is_aligned_p (&foo, ALIGN)); > > + return 0; > > +} > > diff --git a/elf/tst-p_alignmod1-edit.c b/elf/tst-p_alignmod1-edit.c > > new file mode 100644 > > index 0000000000..cdb453e696 > > --- /dev/null > > +++ b/elf/tst-p_alignmod1-edit.c > > @@ -0,0 +1,34 @@ > > +/* Reduce p_align of the first PT_LOAD segment by half. > > + Copyright (C) 2022 Free Software Foundation, Inc. > > + This file is part of the GNU C Library. > > + > > + The GNU C Library is free software; you can redistribute it and/or > > + modify it under the terms of the GNU Lesser General Public > > + License as published by the Free Software Foundation; either > > + version 2.1 of the License, or (at your option) any later version. > > + > > + The GNU C Library is distributed in the hope that it will be useful, > > + but WITHOUT ANY WARRANTY; without even the implied warranty of > > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + Lesser General Public License for more details. > > + > > + You should have received a copy of the GNU Lesser General Public > > + License along with the GNU C Library; if not, see > > + <https://www.gnu.org/licenses/>. */ > > + > > +#include "tst-elf-edit.h" > > + > > +/* Reduce p_align by half. */ > > + > > +static size_t > > +update_p_align (size_t p_align) > > +{ > > + size_t pagesize = sysconf (_SC_PAGESIZE); > > + size_t new_p_align = p_align >> 1; > > + > > + if (new_p_align >= pagesize) > > + error (1, 0, "%s: new p_align (0x%zx) >= page size (0x%zx)", > > + file_name, new_p_align, pagesize); > > + > > + return new_p_align; > > +}
diff --git a/elf/Makefile b/elf/Makefile index 692a65b061..94ebcab1fa 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -412,6 +412,8 @@ tests += \ tst-nodelete-opened \ tst-noload \ tst-null-argv \ + tst-p_alignmod1-edit \ + tst-p_align1 \ tst-relsort1 \ tst-ro-dynamic \ tst-rtld-run-static \ @@ -728,6 +730,7 @@ modules-names = \ tst-nodelete-dlclose-plugin \ tst-nodelete-opened-lib \ tst-null-argv-lib \ + tst-p_alignmod-base \ tst-relsort1mod1 \ tst-relsort1mod2 \ tst-ro-dynamic-mod \ @@ -2578,3 +2581,16 @@ CFLAGS-tst-dl_find_object-mod6.c += -funwind-tables CFLAGS-tst-dl_find_object-mod7.c += -funwind-tables CFLAGS-tst-dl_find_object-mod8.c += -funwind-tables CFLAGS-tst-dl_find_object-mod9.c += -funwind-tables + +$(objpfx)tst-p_alignmod-base.so: $(libsupport) + +$(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so + +# Make a copy of tst-p_alignmod-base.so and lower p_align of the first +# PT_LOAD segment. +$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod1-edit \ + $(objpfx)tst-p_alignmod-base.so + rm -f $@ + cp $(objpfx)tst-p_alignmod-base.so $@ + $(test-wrapper-env) $(run-program-env) $(rtld-prefix) \ + $(objpfx)tst-p_alignmod1-edit $@ diff --git a/elf/tst-elf-edit.h b/elf/tst-elf-edit.h new file mode 100644 index 0000000000..b764e78933 --- /dev/null +++ b/elf/tst-elf-edit.h @@ -0,0 +1,126 @@ +/* Update p_align of the first PT_LOAD segment. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <stdbool.h> +#include <unistd.h> +#include <fcntl.h> +#include <link.h> +#include <error.h> +#include <errno.h> +#include <sys/stat.h> +#include <sys/mman.h> + +const char *file_name; + +static size_t update_p_align (size_t); + +int +main (int argc, char ** argv) +{ + if (argc != 2) + { + printf ("Usage: %s: file\n", argv[0]); + return 0; + } + + file_name = argv[1]; + struct stat statbuf; + int errno_saved; + + if (stat (file_name, &statbuf) < 0) + error (1, errno, "%s: not exist", file_name); + + ElfW(Ehdr) *ehdr; + + if (statbuf.st_size < sizeof (*ehdr)) + error (1, 0, "%s: too small", file_name); + + int fd = open (file_name, O_RDWR); + if (fd < 0) + error (1, errno, "%s: can't open", file_name); + + /* Map in the whole file. */ + void *base = mmap (NULL, statbuf.st_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (base == MAP_FAILED) + { + errno_saved = errno; + close (fd); + error (1, errno_saved, "%s: failed to map", file_name); + } + + ehdr = (ElfW(Ehdr) *) base; + if (ehdr->e_ident[EI_MAG0] != ELFMAG0 + || ehdr->e_ident[EI_MAG1] != ELFMAG1 + || ehdr->e_ident[EI_MAG2] != ELFMAG2 + || ehdr->e_ident[EI_MAG3] != ELFMAG3) + { + close (fd); + error (1, 0, "%s: bad ELF header", file_name); + } + + if (ehdr->e_type != ET_DYN) + { + close (fd); + error (1, 0, "%s: not shared library", file_name); + } + + bool unsupported_class = true; + switch (ehdr->e_ident[EI_CLASS]) + { + default: + break; + + case ELFCLASS32: + unsupported_class = __ELF_NATIVE_CLASS != 32; + break; + + case ELFCLASS64: + unsupported_class = __ELF_NATIVE_CLASS != 64; + break; + } + + if (unsupported_class) + { + close (fd); + error (1, 0, "%s: unsupported ELF class: %d", + file_name, ehdr->e_ident[EI_CLASS]); + } + + size_t phdr_size = sizeof (ElfW(Phdr)) * ehdr->e_phentsize; + if (statbuf.st_size < (ehdr->e_phoff + phdr_size)) + { + close (fd); + error (1, 0, "%s: too small", file_name); + } + + ElfW(Phdr) *phdr = (ElfW(Phdr) *) (base + ehdr->e_phoff); + for (int i = 0; i < ehdr->e_phnum; i++, phdr++) + if (phdr->p_type == PT_LOAD) + { + /* Update p_align of the first PT_LOAD segment. */ + phdr->p_align = update_p_align (phdr->p_align); + break; + } + + munmap (base, statbuf.st_size); + close (fd); + + return 0; +} diff --git a/elf/tst-p_align.h b/elf/tst-p_align.h new file mode 100644 index 0000000000..cef92330fb --- /dev/null +++ b/elf/tst-p_align.h @@ -0,0 +1,20 @@ +/* Prototypes to check different alignments of PT_LOAD segments in + a shared library. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +extern int do_load_test (void); diff --git a/elf/tst-p_align1.c b/elf/tst-p_align1.c new file mode 100644 index 0000000000..961c7fbbf1 --- /dev/null +++ b/elf/tst-p_align1.c @@ -0,0 +1,27 @@ +/* Check different alignments of PT_LOAD segments in a shared library. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include "tst-p_align.h" + +static int +do_test (void) +{ + return do_load_test (); +} + +#include <support/test-driver.c> diff --git a/elf/tst-p_alignmod-base.c b/elf/tst-p_alignmod-base.c new file mode 100644 index 0000000000..0fc1b75523 --- /dev/null +++ b/elf/tst-p_alignmod-base.c @@ -0,0 +1,41 @@ +/* Check alignment of PT_LOAD segment in a shared library. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <stdbool.h> +#include <stdint.h> +#include <support/check.h> +#include <tst-file-align.h> +#include "tst-p_align.h" + +int foo __attribute__ ((aligned (ALIGN))) = 1; + +bool +__attribute__ ((weak, noclone, noinline)) +is_aligned_p (void *p, int align) +{ + return (((uintptr_t) p) & (align - 1)) == 0; +} + +int +do_load_test (void) +{ + printf ("foo: %p\n", &foo); + TEST_VERIFY (is_aligned_p (&foo, ALIGN)); + return 0; +} diff --git a/elf/tst-p_alignmod1-edit.c b/elf/tst-p_alignmod1-edit.c new file mode 100644 index 0000000000..cdb453e696 --- /dev/null +++ b/elf/tst-p_alignmod1-edit.c @@ -0,0 +1,34 @@ +/* Reduce p_align of the first PT_LOAD segment by half. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include "tst-elf-edit.h" + +/* Reduce p_align by half. */ + +static size_t +update_p_align (size_t p_align) +{ + size_t pagesize = sysconf (_SC_PAGESIZE); + size_t new_p_align = p_align >> 1; + + if (new_p_align >= pagesize) + error (1, 0, "%s: new p_align (0x%zx) >= page size (0x%zx)", + file_name, new_p_align, pagesize); + + return new_p_align; +}