/* Validate user module based on build-id (if present) */
static int _stp_usermodule_check(struct task_struct *tsk, const char *path_name, unsigned long addr)
{
struct _stp_module *m = NULL;
unsigned long notes_addr;
unsigned i, j;
unsigned char practice_id_bits[MAXSTRINGLEN];
unsigned long vm_end = 0;
#ifdef STP_NO_BUILDID_CHECK
return 0;
#endif
for (i = 0; i < _stp_num_modules; i++)
{
m = _stp_modules[i];
if (strcmp(path_name, _stp_modules[i]->path) != 0)
continue;
if (m->build_id_len > 0) {
int ret, build_id_len;
notes_addr = addr + m->build_id_offset /* + m->module_base */;
dbug_sym(1, "build-id validation [%d %s] address=%#lx build_id_offset=%#lx\n",
tsk->pid, m->path, addr, m->build_id_offset);
if (notes_addr <= addr) {
_stp_warn ("build-id address %lx < base %lx\n", notes_addr, addr);
continue;
}
return _stp_build_id_check (m, notes_addr, tsk);
}
}
return 0;
}
/* Iterate over _stp_modules, looking for a kernel module of given
name. Run build-id checking for it. Return 0 on ok. */
static int _stp_kmodule_check (const char *name)
{
struct _stp_module *m = NULL;
unsigned long notes_addr, base_addr;
unsigned i,j;
#ifdef STP_NO_BUILDID_CHECK
return 0;
#endif
for (i = 0; i < _stp_num_modules; i++)
{
m = _stp_modules[i];
if (strcmp (name, m->name)) continue;
if (m->build_id_len > 0 && m->notes_sect != 0) {
dbug_sym(1, "build-id validation [%s]\n", m->name);
/* notes end address */
notes_addr = m->notes_sect + m->build_id_offset;
base_addr = m->notes_sect;
if (notes_addr <= base_addr) { /* shouldn't happen */
_stp_warn ("build-id address %lx < base %lx\n",
notes_addr, base_addr);
continue;
}
return _stp_build_id_check (m, notes_addr, NULL);
} /* end checking */
} /* end loop */
return 0; /* name not found */
}
/* Validate all-modules + kernel based on build-id (if present).
* The completed case is the following combination:
* Debuginfo Module Kernel
* X X
* has build-id/not unloaded has build-id/not
* loaded && (has build-id/not)
*
* NB: build-id exists only if ld>=2.18 and kernel>= 2.6.23
*/
static int _stp_module_check(void)
{
struct _stp_module *m = NULL;
unsigned long notes_addr, base_addr;
unsigned i,j;
int rc = 0;
#ifdef STP_NO_BUILDID_CHECK
return 0;
#endif
for (i = 0; i < _stp_num_modules; i++)
{
m = _stp_modules[i];
if (m->build_id_len > 0 && m->notes_sect != 0) {
dbug_sym(1, "build-id validation [%s]\n", m->name); /* kernel only */
/* skip userspace program */
if (m->name[0] != '/') continue;
/* notes end address */
if (!strcmp(m->name, "kernel")) {
notes_addr = _stp_kmodule_relocate("kernel",
"_stext", m->build_id_offset);
base_addr = _stp_kmodule_relocate("kernel",
"_stext", 0);
} else {
notes_addr = m->notes_sect + m->build_id_offset;
base_addr = m->notes_sect;
}
if (notes_addr <= base_addr) { /* shouldn't happen */
_stp_warn ("build-id address %lx <= base %lx\n",
notes_addr, base_addr);
continue;
}
rc |= _stp_build_id_check (m, notes_addr, NULL);
} /* end checking */
} /* end loop */
return rc;
}
/* Validate user module based on build-id (if present) */
static int _stp_usermodule_check(struct task_struct *tsk, const char *path_name, unsigned long addr)
{
struct _stp_module *m = NULL;
unsigned long notes_addr;
unsigned i, j;
unsigned char practice_id_bits[MAXSTRINGLEN];
unsigned long vm_end = 0;
#ifdef STP_NO_BUILDID_CHECK
return 0;
#endif
WARN_ON(!path_name || path_name[0]!='/'); // user-space only
for (i = 0; i < _stp_num_modules; i++)
{
m = _stp_modules[i];
/* PR16406 must be unique userspace name (/-prefixed path); it's also in m->name */
if (strcmp(path_name, m->path) != 0) continue;
if (m->build_id_len > 0) {
int ret, build_id_len;
notes_addr = addr + m->build_id_offset /* + m->module_base */;
dbug_sym(1, "build-id validation [%d %s] address=%#lx build_id_offset=%#lx\n",
tsk->pid, m->path, addr, m->build_id_offset);
if (notes_addr <= addr) {
_stp_warn ("build-id address %lx < base %lx\n", notes_addr, addr);
continue;
}
return _stp_build_id_check (m, notes_addr, tsk);
}
}
return 0; /* not found */
}
/* Iterate over _stp_modules, looking for a kernel module of given
name. Run build-id checking for it. Return 0 on ok. */
static int _stp_kmodule_check (const char *name)
{
struct _stp_module *m = NULL;
unsigned long notes_addr, base_addr;
unsigned i,j;
#ifdef STP_NO_BUILDID_CHECK
return 0;
#endif
WARN_ON(!name || name[0]=='/'); // non-userspace only
for (i = 0; i < _stp_num_modules; i++)
{
m = _stp_modules[i];
/* PR16406 must be unique kernel module name (non-/-prefixed path) */
if (strcmp (name, m->name)) continue;
if (m->build_id_len > 0 && m->notes_sect != 0) {
dbug_sym(1, "build-id validation [%s]\n", m->name);
/* notes end address */
notes_addr = m->notes_sect + m->build_id_offset;
base_addr = m->notes_sect;
if (notes_addr <= base_addr) { /* shouldn't happen */
_stp_warn ("build-id address %lx < base %lx\n",
notes_addr, base_addr);
continue;
}
return _stp_build_id_check (m, notes_addr, NULL);
} /* end checking */
} /* end loop */
return 0; /* not found */
}
