132 lines
4.8 KiB
Diff
132 lines
4.8 KiB
Diff
Patch series proposed upstream:
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<https://sourceware.org/pipermail/libc-alpha/2021-June/127473.html>
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Wed Jun 9 14:12:46 2021 +0200
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elf: Generalize name-based DSO recognition in ldconfig
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This introduces <dl-is_dso.h> and the _dl_is_dso function. A
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test ensures that the official names of libc.so, ld.so, and their
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versioned names are recognized.
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diff --git a/elf/Makefile b/elf/Makefile
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index 38d08e03b8979a81..62f7e8a22544ab9d 100644
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--- a/elf/Makefile
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+++ b/elf/Makefile
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@@ -223,7 +223,8 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-single_threaded tst-single_threaded-pthread \
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tst-tls-ie tst-tls-ie-dlmopen argv0test \
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tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
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- tst-tls20 tst-tls21 tst-dlmopen-dlerror tst-dlmopen-gethostbyname
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+ tst-tls20 tst-tls21 tst-dlmopen-dlerror tst-dlmopen-gethostbyname \
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+ tst-dl-is_dso
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# reldep9
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tests-internal += loadtest unload unload2 circleload1 \
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neededtest neededtest2 neededtest3 neededtest4 \
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diff --git a/elf/dl-is_dso.h b/elf/dl-is_dso.h
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new file mode 100644
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index 0000000000000000..94e00966a16e0df5
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--- /dev/null
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+++ b/elf/dl-is_dso.h
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@@ -0,0 +1,33 @@
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+/* Heuristic for recognizing DSO file names.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <stdbool.h>
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+#include <string.h>
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+
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+/* Returns true if the file name looks like a DSO name. */
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+static bool
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+_dl_is_dso (const char *name)
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+{
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+ /* Recognize lib*.so*, ld-*.so*, ld.so.*, ld64.so.*. ld-*.so*
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+ matches both platform dynamic linker names like ld-linux.so.2,
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+ and versioned dynamic loader names like ld-2.12.so. */
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+ return (((strncmp (name, "lib", 3) == 0 || strncmp (name, "ld-", 3) == 0)
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+ && strstr (name, ".so") != NULL)
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+ || strncmp (name, "ld.so.", 6) == 0
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+ || strncmp (name, "ld64.so.", 8) == 0);
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+}
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diff --git a/elf/ldconfig.c b/elf/ldconfig.c
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index 96bf7700b2efd37a..1037e8d0cf8d28b6 100644
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--- a/elf/ldconfig.c
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+++ b/elf/ldconfig.c
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@@ -43,6 +43,7 @@
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#include <ldconfig.h>
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#include <dl-cache.h>
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#include <dl-hwcaps.h>
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+#include <dl-is_dso.h>
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#include <dl-procinfo.h>
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@@ -842,9 +843,7 @@ search_dir (const struct dir_entry *entry)
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subdirectory (if not already processing a glibc-hwcaps
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subdirectory)? The dynamic linker is also considered as
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shared library. */
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- if (((strncmp (direntry->d_name, "lib", 3) != 0
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- && strncmp (direntry->d_name, "ld-", 3) != 0)
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- || strstr (direntry->d_name, ".so") == NULL)
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+ if (!_dl_is_dso (direntry->d_name)
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&& (direntry->d_type == DT_REG
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|| (entry->hwcaps == NULL
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&& !is_hwcap_platform (direntry->d_name))))
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diff --git a/elf/tst-dl-is_dso.c b/elf/tst-dl-is_dso.c
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new file mode 100644
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index 0000000000000000..48d2cc9fbe9edbc6
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--- /dev/null
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+++ b/elf/tst-dl-is_dso.c
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@@ -0,0 +1,35 @@
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+/* Test heuristic for recognizing DSO file names.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <dl-is_dso.h>
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+#include <gnu/lib-names.h>
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+#include <support/check.h>
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+
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+static int
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+do_test (void)
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+{
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+ /* Official ABI names. */
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+ TEST_VERIFY (_dl_is_dso (LIBC_SO));
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+ TEST_VERIFY (_dl_is_dso (LD_SO));
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+ /* Version-based names. The version number does not matter. */
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+ TEST_VERIFY (_dl_is_dso ("libc-2.12.so"));
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+ TEST_VERIFY (_dl_is_dso ("ld-2.12.so"));
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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