summaryrefslogtreecommitdiff
path: root/test/dlopen/nodelete.c
diff options
context:
space:
mode:
authorLeonid Lisovskiy <lly.dev@gmail.com>2016-01-13 21:00:05 +0300
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-01-31 17:39:37 +0100
commit27f1b2c66c67e601dd619a1def70a8fd7ca5eeba (patch)
tree90a57981936937d51fa6dab56026f5f7c8bfcc80 /test/dlopen/nodelete.c
parent12a85731dc5fda3bc01ab19c82678b3bf122d794 (diff)
libdl: dlopen() mustn't forget RTLD_NODELETE flag
If RTLD_NODELETE is passed to dlopen() rather than set on shared library itself, flag propagation to rtld_flags is missed. Test-case taken from glibc. Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com> Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'test/dlopen/nodelete.c')
-rw-r--r--test/dlopen/nodelete.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/test/dlopen/nodelete.c b/test/dlopen/nodelete.c
new file mode 100644
index 000000000..07ff96136
--- /dev/null
+++ b/test/dlopen/nodelete.c
@@ -0,0 +1,205 @@
+#include <dlfcn.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+static sigjmp_buf jmpbuf;
+
+
+int fini_ran;
+
+
+static void
+__attribute__ ((noreturn))
+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. */
+ void *p;
+ struct sigaction sa;
+
+ sa.sa_handler = handler;
+ sigfillset (&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+
+ if (sigaction (SIGSEGV, &sa, NULL) == -1)
+ puts ("cannot install signal handler: %m");
+
+ p = dlopen ("nodelmod1.so", RTLD_LAZY);
+ if (p == NULL)
+ {
+ printf ("failed to load \"nodelmod1.so\": %s\n", dlerror ());
+ exit (1);
+ }
+ else
+ {
+ int *varp;
+
+ varp = dlsym (p, "var1");
+ if (varp == NULL)
+ {
+ puts ("failed to get address of \"var1\" in \"nodelmod1.so\"");
+ exit (1);
+ }
+ else
+ {
+ *varp = 20000720;
+
+ /* Now close the object. */
+ fini_ran = 0;
+ if (dlclose (p) != 0)
+ {
+ puts ("failed to close \"nodelmod1.so\"");
+ exit (1);
+ }
+ else if (! sigsetjmp (jmpbuf, 1))
+ {
+ /* Access the variable again. */
+ if (*varp != 20000720)
+ {
+ puts ("\"var1\" value not correct");
+ exit (1);
+ }
+ else if (fini_ran != 0)
+ {
+ puts ("destructor of \"nodelmod1.so\" ran");
+ exit (1);
+ }
+ else
+ puts ("-z nodelete test succeeded");
+ }
+ else
+ {
+ /* We caught an segmentation fault. */
+ puts ("\"nodelmod1.so\" got deleted!");
+ exit (1);
+ }
+ }
+ }
+
+ p = dlopen ("nodelmod2.so", RTLD_LAZY | RTLD_NODELETE);
+ if (p == NULL)
+ {
+ printf ("failed to load \"nodelmod2.so\": %s\n", dlerror ());
+ exit (1);
+ }
+ else
+ {
+ int *varp;
+
+ varp = dlsym (p, "var2");
+ if (varp == NULL)
+ {
+ puts ("failed to get address of \"var2\" in \"nodelmod2.so\"");
+ exit (1);
+ }
+ else
+ {
+ *varp = 42;
+
+ /* Now close the object. */
+ fini_ran = 0;
+ if (dlclose (p) != 0)
+ {
+ puts ("failed to close \"nodelmod2.so\"");
+ exit (1);
+ }
+ else if (! sigsetjmp (jmpbuf, 1))
+ {
+ /* Access the variable again. */
+ if (*varp != 42)
+ {
+ puts ("\"var2\" value not correct");
+ exit (1);
+ }
+ else if (fini_ran != 0)
+ {
+ puts ("destructor of \"nodelmod2.so\" ran");
+ exit (1);
+ }
+ else
+ puts ("RTLD_NODELETE test succeeded");
+ }
+ else
+ {
+ /* We caught an segmentation fault. */
+ puts ("\"nodelmod2.so\" got deleted!");
+ exit (1);
+ }
+ }
+ }
+
+ p = dlopen ("nodelmod3.so", RTLD_LAZY);
+ if (p == NULL)
+ {
+ printf ("failed to load \"nodelmod3.so\": %s\n", dlerror ());
+ exit (1);
+ }
+ else
+ {
+ int *(*fctp) (void);
+
+ fctp = dlsym (p, "addr");
+ if (fctp == NULL)
+ {
+ puts ("failed to get address of \"addr\" in \"nodelmod3.so\"");
+ exit (1);
+ }
+ else
+ {
+ int *varp = fctp ();
+
+ *varp = -1;
+
+ /* Now close the object. */
+ fini_ran = 0;
+ if (dlclose (p) != 0)
+ {
+ puts ("failed to close \"nodelmod3.so\"");
+ exit (1);
+ }
+ else if (! sigsetjmp (jmpbuf, 1))
+ {
+ /* Access the variable again. */
+ if (*varp != -1)
+ {
+ puts ("\"var_in_mod4\" value not correct");
+ exit (1);
+ }
+ else if (fini_ran != 0)
+ {
+ puts ("destructor of \"nodelmod4.so\" ran");
+ exit (1);
+ }
+ else
+ puts ("-z nodelete in dependency succeeded");
+ }
+ else
+ {
+ /* We caught an segmentation fault. */
+ puts ("\"nodelmod4.so\" got deleted!");
+ exit (1);
+ }
+ }
+ }
+
+ return 0;
+}
+
+#include "../test-skeleton.c"