From e6fd79f3795d46dfb583e124be49fc063bc3d58b Mon Sep 17 00:00:00 2001 From: Chung-Lin Tang Date: Thu, 21 Oct 2021 21:41:21 +0800 Subject: elf: Testing infrastructure for ld.so DSO sorting (BZ #17645) This is the first of a 2-part patch set that fixes slow DSO sorting behavior in the dynamic loader, as reported in BZ #17645. In order to facilitate such a large modification to the dynamic loader, this first patch implements a testing framework for validating shared object sorting behavior, to enable comparison between old/new sorting algorithms, and any later enhancements. This testing infrastructure consists of a Python script scripts/dso-ordering-test.py' which takes in a description language, consisting of strings that describe a set of link dependency relations between DSOs, and generates testcase programs and Makefile fragments to automatically test the described situation, for example: a->b->c->d # four objects linked one after another a->[bc]->d;b->c # a depends on b and c, which both depend on d, # b depends on c (b,c linked to object a in fixed order) a->b->c;{+a;%a;-a} # a, b, c serially dependent, main program uses # dlopen/dlsym/dlclose on object a a->b->c;{}!->[abc] # a, b, c serially dependent; multiple tests generated # to test all permutations of a, b, c ordering linked # to main program (Above is just a short description of what the script can do, more documentation is in the script comments.) Two files containing several new tests, elf/dso-sort-tests-[12].def are added, including test scenarios for BZ #15311 and Redhat issue #1162810 [1]. Due to the nature of dynamic loader tests, where the sorting behavior and test output occurs before/after main(), generating testcases to use support/test-driver.c does not suffice to control meaningful timeout for ld.so. Therefore a new utility program 'support/test-run-command', based on test-driver.c/support_test_main.c has been added. This does the same testcase control, but for a program specified through a command-line rather than at the source code level. This utility is used to run the dynamic loader testcases generated by dso-ordering-test.py. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1162810 Signed-off-by: Chung-Lin Tang Reviewed-by: Adhemerval Zanella --- support/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'support/Makefile') diff --git a/support/Makefile b/support/Makefile index 7f03950914..984ec02dfe 100644 --- a/support/Makefile +++ b/support/Makefile @@ -257,10 +257,16 @@ others-noinstall += shell-container echo-container true-container others += $(LINKS_DSO_PROGRAM) others-noinstall += $(LINKS_DSO_PROGRAM) +others += test-run-command +others-static += test-run-command +others-noinstall += test-run-command +LDLIBS-test-run-command = $(libsupport) + $(objpfx)test-container : $(libsupport) $(objpfx)shell-container : $(libsupport) $(objpfx)echo-container : $(libsupport) $(objpfx)true-container : $(libsupport) +$(objpfx)test-run-command : $(libsupport) $(common-objpfx)elf/static-stubs.o tests = \ README-testing \ -- cgit v1.2.3