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glibc/elf/nodelete.c
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#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) | |
{ | |
printf ("failed to load \"nodelmod1.so\": %s\n", dlerror ()); | |
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) | |
{ | |
printf ("failed to load \"nodelmod2.so\": %s\n", dlerror ()); | |
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; | |
} | |
} | |
} | |
p = dlopen ("nodelmod3.so", RTLD_LAZY); | |
if (p == NULL) | |
{ | |
printf ("failed to load \"nodelmod3.so\": %s\n", dlerror ()); | |
result = 1; | |
} | |
else | |
{ | |
int *(*fctp) (void); | |
puts ("succeeded loading \"nodelmod3.so\""); | |
fctp = dlsym (p, "addr"); | |
if (fctp == NULL) | |
{ | |
puts ("failed to get address of \"addr\" in \"nodelmod3.so\""); | |
result = 1; | |
} | |
else | |
{ | |
int *varp = fctp (); | |
*varp = -1; | |
/* Now close the object. */ | |
if (dlclose (p) != 0) | |
{ | |
puts ("failed to close \"nodelmod3.so\""); | |
result = 1; | |
} | |
else if (! sigsetjmp (jmpbuf, 1)) | |
{ | |
/* Access the variable again. */ | |
if (*varp != -1) | |
{ | |
puts ("\"var_in_mod4\" value not correct"); | |
result = 1; | |
} | |
else | |
puts ("-z nodelete in dependency succeeded"); | |
} | |
else | |
{ | |
/* We caught an segmentation fault. */ | |
puts ("\"nodelmod4.so\" got deleted"); | |
result = 1; | |
} | |
} | |
} | |
return result; | |
} | |
#include "../test-skeleton.c" |