From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Subject: [PATCH] elf: Restore how vDSO dependency is printed with LD_TRACE_LOADED_OBJECTS (BZ #29539)
Date: Tue, 30 Aug 2022 13:39:05 -0300 [thread overview]
Message-ID: <20220830163905.2578396-1-adhemerval.zanella@linaro.org> (raw)
The d7703d3176d225d5743b21811d888619eba39e82 changed how vDSO like
dependencies are printed, instead of just the name and address it
follows other libraries mode and prints 'name => path'.
Unfortunately, this broke some ldd consumer that uses the output to
filter out the program's dependencies. For instance CMake
bundleutilities module [1], where GetPrequirite uses the regex to filter
out 'name => path' [2].
This patch restore the previous way to print just the name and the
mapping address.
Checked on x86_64-linux-gnu.
[1] https://github.com/Kitware/CMake/tree/master/Tests/BundleUtilities
[2] https://github.com/Kitware/CMake/blob/master/Modules/GetPrerequisites.cmake#L733
---
elf/rtld.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/elf/rtld.c b/elf/rtld.c
index cbbaf4a331..3e771a93d8 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -2122,6 +2122,12 @@ dl_main (const ElfW(Phdr) *phdr,
if (l->l_faked)
/* The library was not found. */
_dl_printf ("\t%s => not found\n", l->l_libname->name);
+ else if (strcmp (l->l_libname->name, l->l_name) == 0)
+ /* Print vDSO like libraries without duplicate name. Some
+ consumers depend of this format. */
+ _dl_printf ("\t%s (0x%0*Zx)\n", l->l_libname->name,
+ (int) sizeof l->l_map_start * 2,
+ (size_t) l->l_map_start);
else
_dl_printf ("\t%s => %s (0x%0*Zx)\n",
DSO_FILENAME (l->l_libname->name),
--
2.34.1
next reply other threads:[~2022-08-30 16:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-30 16:39 Adhemerval Zanella [this message]
2022-08-31 6:42 ` Florian Weimer
2022-08-31 6:42 ` Florian Weimer
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