diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 12 | ||||
| -rw-r--r-- | elf/nodelete.c | 140 | ||||
| -rw-r--r-- | elf/nodelmod1.c | 1 | ||||
| -rw-r--r-- | elf/nodelmod2.c | 1 |
4 files changed, 152 insertions, 2 deletions
diff --git a/elf/Makefile b/elf/Makefile index 6224c22..db6d428 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -85,13 +85,17 @@ endif ifeq (yes,$(build-shared)) tests = loadtest restest1 preloadtest loadfail multiload origtest resolvfail \ - constload1 order $(tests-vis-$(have-protected)) noload + constload1 order $(tests-vis-$(have-protected)) noload \ + $(tests-nodelete-$(have-z-nodelete)) tests-vis-yes = vismain +tests-nodelete-yes = nodelete endif modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \ testobj1_1 failobj constload2 constload3 \ - dep1 dep2 dep3 dep4 $(modules-vis-$(have-protected)) + dep1 dep2 dep3 dep4 $(modules-vis-$(have-protected)) \ + $(modules-nodelete-$(have-z-nodelete)) modules-vis-yes = vismod1 vismod2 vismod3 +modules-nodelete-yes = nodelmod1 nodelmod2 extra-objs += $(addsuffix .os,$(strip $(modules-names))) include ../Rules @@ -294,3 +298,7 @@ vismain-ENV = LD_PRELOAD=$(addprefix $(objpfx),vismod3.so) $(objpfx)noload: $(objpfx)testobj1.so LDFLAGS-noload = -rdynamic $(objpfx)noload.out: $(objpfx)testobj5.so + +LDFLAGS-nodelmod1.so = -Wl,--enable-new-dtags,-z,nodelete +$(objpfx)nodelete: $(libdl) +$(objpfx)nodelete.out: $(objpfx)nodelmod1.so $(objpfx)nodelmod2.so diff --git a/elf/nodelete.c b/elf/nodelete.c new file mode 100644 index 0000000..317a2a0 --- /dev/null +++ b/elf/nodelete.c @@ -0,0 +1,140 @@ +#include <dlfcn.h> +#include <setjmp.h> +#include <signal.h> +#include <stdio.h> + + +static sigjmp_buf jmpbuf; + + +static void +handler (int sig) +{ + siglongjmp (jmpbuf, 1); +} + + +#define TEST_FUNCTION do_test () +static int +do_test (void) +{ + /* We are testing the two possibilities to mark an object as not deletable: + - marked on the linker commandline with `-z nodelete' + - with the RTLD_NODELETE flag at dlopen()-time. + + The test we are performing should be safe. We are loading the objects, + get the address of variables in the respective object, unload the object + and then try to read the variable. If the object is unloaded this + should lead to an segmentation fault. */ + int result = 0; + void *p; + struct sigaction sa; + + sa.sa_handler = handler; + sigfillset (&sa.sa_mask); + sa.sa_flags = SA_RESTART; + sa.sa_restorer = NULL; + + if (sigaction (SIGSEGV, &sa, NULL) == -1) + printf ("cannot install signal handler: %m\n"); + + p = dlopen ("nodelmod1.so", RTLD_LAZY); + if (p == NULL) + { + puts ("failed to load \"nodelmod1.so\""); + result = 1; + } + else + { + int *varp; + + puts ("succeeded loading \"nodelmod1.so\""); + + varp = dlsym (p, "var1"); + if (varp == NULL) + { + puts ("failed to get address of \"var1\" in \"nodelmod1.so\""); + result = 1; + } + else + { + *varp = 20000720; + + /* Now close the object. */ + if (dlclose (p) != 0) + { + puts ("failed to close \"nodelmod1.so\""); + result = 1; + } + else if (! sigsetjmp (jmpbuf, 1)) + { + /* Access the variable again. */ + if (*varp != 20000720) + { + puts ("\"var1\" value not correct"); + result = 1; + } + else + puts ("-z nodelete test succeeded"); + } + else + { + /* We caught an segmentation fault. */ + puts ("\"nodelmod1.so\" got deleted"); + result = 1; + } + } + } + + p = dlopen ("nodelmod2.so", RTLD_LAZY | RTLD_NODELETE); + if (p == NULL) + { + puts ("failed to load \"nodelmod2.so\""); + result = 1; + } + else + { + int *varp; + + puts ("succeeded loading \"nodelmod2.so\""); + + varp = dlsym (p, "var2"); + if (varp == NULL) + { + puts ("failed to get address of \"var2\" in \"nodelmod2.so\""); + result = 1; + } + else + { + *varp = 42; + + /* Now close the object. */ + if (dlclose (p) != 0) + { + puts ("failed to close \"nodelmod2.so\""); + result = 1; + } + else if (! sigsetjmp (jmpbuf, 1)) + { + /* Access the variable again. */ + if (*varp != 42) + { + puts ("\"var2\" value not correct"); + result = 1; + } + else + puts ("RTLD_NODELETE test succeeded"); + } + else + { + /* We caught an segmentation fault. */ + puts ("\"nodelmod2.so\" got deleted"); + result = 1; + } + } + } + + return result; +} + +#include "../test-skeleton.c" diff --git a/elf/nodelmod1.c b/elf/nodelmod1.c new file mode 100644 index 0000000..abae539 --- /dev/null +++ b/elf/nodelmod1.c @@ -0,0 +1 @@ +int var1 = 42; diff --git a/elf/nodelmod2.c b/elf/nodelmod2.c new file mode 100644 index 0000000..1dd16e5 --- /dev/null +++ b/elf/nodelmod2.c @@ -0,0 +1 @@ +int var2 = 100; |