summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--ldso/libdl/libdl.c6
-rw-r--r--test/dlopen/Makefile.in9
-rw-r--r--test/dlopen/nodelete.c205
-rw-r--r--test/dlopen/nodelmod1.c10
-rw-r--r--test/dlopen/nodelmod2.c10
-rw-r--r--test/dlopen/nodelmod3.c8
-rw-r--r--test/dlopen/nodelmod4.c10
7 files changed, 254 insertions, 4 deletions
diff --git a/ldso/libdl/libdl.c b/ldso/libdl/libdl.c
index 2c4b06411..08619bc37 100644
--- a/ldso/libdl/libdl.c
+++ b/ldso/libdl/libdl.c
@@ -394,7 +394,7 @@ static void *do_dlopen(const char *libname, int flag, ElfW(Addr) from)
dyn_chain = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
memset(dyn_chain, 0, sizeof(struct dyn_elf));
dyn_chain->dyn = tpnt;
- tpnt->rtld_flags |= (flag & RTLD_GLOBAL);
+ tpnt->rtld_flags |= (flag & (RTLD_GLOBAL|RTLD_NODELETE));
dyn_chain->next_handle = _dl_handles;
_dl_handles = dyn_ptr = dyn_chain;
@@ -407,7 +407,7 @@ static void *do_dlopen(const char *libname, int flag, ElfW(Addr) from)
dyn_chain->init_fini.init_fini = handle->init_fini.init_fini;
dyn_chain->init_fini.nlist = handle->init_fini.nlist;
for (i = 0; i < dyn_chain->init_fini.nlist; i++)
- dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & RTLD_GLOBAL);
+ dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & (RTLD_GLOBAL|RTLD_NODELETE));
dyn_chain->next = handle->next;
break;
}
@@ -439,7 +439,7 @@ static void *do_dlopen(const char *libname, int flag, ElfW(Addr) from)
if (!tpnt1)
goto oops;
- tpnt1->rtld_flags |= (flag & RTLD_GLOBAL);
+ tpnt1->rtld_flags |= (flag & (RTLD_GLOBAL|RTLD_NODELETE));
/* This list is for dlsym() and relocation */
dyn_ptr->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
diff --git a/test/dlopen/Makefile.in b/test/dlopen/Makefile.in
index 85996def4..a02b2b96e 100644
--- a/test/dlopen/Makefile.in
+++ b/test/dlopen/Makefile.in
@@ -5,7 +5,7 @@
export UCLIBC_ONLY := 1
TESTS := dltest dltest2 dlstatic test1 test2 test3 dlundef dlafk dladdr \
- testscope
+ testscope nodelete
ifneq ($(HAVE_SHARED),y)
TESTS_DISABLED := test3
@@ -63,3 +63,10 @@ LDFLAGS_libtest3.so := -lpthread -Wl,-rpath,.
LDFLAGS_libC.so := -ldl
LDFLAGS_libB.so := ./libC.so -Wl,-rpath,.
LDFLAGS_libA.so := ./libB.so -Wl,-rpath,.
+
+nodelete: nodelmod1.so nodelmod2.so nodelmod3.so
+nodelmod3.so: nodelmod4.so
+LDFLAGS_nodelete := -rdynamic -ldl
+LDFLAGS_nodelmod1.so := -Wl,-z,nodelete
+LDFLAGS_nodelmod3.so := ./nodelmod4.so
+LDFLAGS_nodelmod4.so := -Wl,-z,nodelete
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"
diff --git a/test/dlopen/nodelmod1.c b/test/dlopen/nodelmod1.c
new file mode 100644
index 000000000..51be080af
--- /dev/null
+++ b/test/dlopen/nodelmod1.c
@@ -0,0 +1,10 @@
+extern int fini_ran;
+
+int var1 = 42;
+
+static void
+__attribute__ ((__destructor__))
+destr (void)
+{
+ fini_ran = 1;
+}
diff --git a/test/dlopen/nodelmod2.c b/test/dlopen/nodelmod2.c
new file mode 100644
index 000000000..ff2ffc2fc
--- /dev/null
+++ b/test/dlopen/nodelmod2.c
@@ -0,0 +1,10 @@
+extern int fini_ran;
+
+int var2 = 100;
+
+static void
+__attribute__ ((__destructor__))
+destr (void)
+{
+ fini_ran = 1;
+}
diff --git a/test/dlopen/nodelmod3.c b/test/dlopen/nodelmod3.c
new file mode 100644
index 000000000..817c94db6
--- /dev/null
+++ b/test/dlopen/nodelmod3.c
@@ -0,0 +1,8 @@
+extern int var_in_mod4;
+extern int *addr (void);
+
+int *
+addr (void)
+{
+ return &var_in_mod4;
+}
diff --git a/test/dlopen/nodelmod4.c b/test/dlopen/nodelmod4.c
new file mode 100644
index 000000000..d7fa89396
--- /dev/null
+++ b/test/dlopen/nodelmod4.c
@@ -0,0 +1,10 @@
+extern int fini_ran;
+
+int var_in_mod4 = 99;
+
+static void
+__attribute__ ((__destructor__))
+destr (void)
+{
+ fini_ran = 1;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 14:25:25 +0000