@@ -378,6 +378,13 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
tst-auditmod18 \
tst-audit18mod \
+ifeq (yesyes,$(build-shared)$(run-built-tests))
+tests += \
+ tst-alignmod3-edit \
+ tst-p_align1 \
+
+endif
+
# Most modules build with _ISOMAC defined, but those filtered out
# depend on internal headers.
modules-names-tests = $(filter-out ifuncmod% tst-tlsmod%,\
@@ -1995,3 +2002,14 @@ $(objpfx)tst-ro-dynamic-mod.so: $(objpfx)tst-ro-dynamic-mod.os \
$(objpfx)tst-ro-dynamic-mod.os
$(objpfx)tst-rtld-run-static.out: $(objpfx)/ldconfig
+
+$(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so
+
+# Make a copy of tst-alignmod3.so and lower p_align of the first PT_LOAD
+# segment.
+$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-alignmod3-edit \
+ $(objpfx)tst-alignmod3.so
+ rm -f $@
+ cp $(objpfx)tst-alignmod3.so $@
+ $(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
+ $(objpfx)tst-alignmod3-edit $@
new file mode 100644
@@ -0,0 +1,130 @@
+/* Lower p_align of the first PT_LOAD segment.
+ Copyright (C) 2021 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>
+
+int
+main (int argc, char ** argv)
+{
+ if (argc != 2)
+ {
+ printf ("Usage: %s: file\n", argv[0]);
+ return 0;
+ }
+
+ const char *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);
+ }
+
+ size_t pagesize = sysconf (_SC_PAGESIZE);
+
+ 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)
+ {
+ /* Reduce p_align of the first PT_LOAD segment by half. */
+ if ((phdr->p_align >> 1) < pagesize)
+ {
+ close (fd);
+ error (1, 0, "%s: p_align (0x%zx) < 2 * page size (0x%zx)",
+ file_name, phdr->p_align, 2 * pagesize);
+ }
+ phdr->p_align >>= 1;
+ break;
+ }
+
+ munmap (base, statbuf.st_size);
+ close (fd);
+
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,27 @@
+/* Check different alignments of PT_LOAD segments in a shared library.
+ Copyright (C) 2021 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);
+
+static int
+do_test (void)
+{
+ return do_load_test ();
+}
+
+#include <support/test-driver.c>