void __init_ssp(size_t *);
void *__install_initial_tls(void *);
+void __init_libc(char **, char *);
static struct dso *head, *tail, *ldso, *fini_head;
static char *env_path, *sys_path, *r_path;
static int runtime;
static int ldd_mode;
static int ldso_fail;
-static jmp_buf rtld_fail;
+static int noload;
+static jmp_buf *rtld_fail;
static pthread_rwlock_t lock;
static struct debug debug;
static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t);
}
#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
-#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
+#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)
static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
{
snprintf(errbuf, sizeof errbuf,
"Error relocating %s: %s: symbol not found",
dso->name, name);
- if (runtime) longjmp(rtld_fail, 1);
+ if (runtime) longjmp(*rtld_fail, 1);
dprintf(2, "%s\n", errbuf);
ldso_fail = 1;
continue;
size_t this_min, this_max;
off_t off_start;
Ehdr *eh;
- Phdr *ph;
+ Phdr *ph, *ph0;
unsigned prot;
unsigned char *map, *base;
size_t dyn;
size_t i;
ssize_t l = read(fd, buf, sizeof buf);
- if (l<sizeof *eh) return 0;
+ if (l<(int)sizeof *eh) return 0;
eh = buf;
+ if (eh->e_type != ET_DYN && eh->e_type != ET_EXEC) {
+ errno = ENOEXEC;
+ return 0;
+ }
phsize = eh->e_phentsize * eh->e_phnum;
if (phsize + sizeof *eh > l) return 0;
if (eh->e_phoff + phsize > l) {
l = pread(fd, buf+1, phsize, eh->e_phoff);
if (l != phsize) return 0;
- eh->e_phoff = sizeof *eh;
+ ph = ph0 = (void *)(buf + 1);
+ } else {
+ ph = ph0 = (void *)((char *)buf + eh->e_phoff);
}
- ph = (void *)((char *)buf + eh->e_phoff);
- dso->phdr = ph;
- dso->phnum = eh->e_phnum;
for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
if (ph->p_type == PT_DYNAMIC)
dyn = ph->p_vaddr;
* amount of virtual address space to map over later. */
map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
if (map==MAP_FAILED) return 0;
+ /* If the loaded file is not relocatable and the requested address is
+ * not available, then the load operation must fail. */
+ if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) {
+ errno = EBUSY;
+ goto error;
+ }
base = map - addr_min;
- ph = (void *)((char *)buf + eh->e_phoff);
- for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
+ dso->phdr = 0;
+ dso->phnum = 0;
+ for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
if (ph->p_type != PT_LOAD) continue;
+ /* Check if the programs headers are in this load segment, and
+ * if so, record the address for use by dl_iterate_phdr. */
+ if (!dso->phdr && eh->e_phoff >= ph->p_offset
+ && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
+ dso->phdr = (void *)(base + ph->p_vaddr
+ + (eh->e_phoff-ph->p_offset));
+ dso->phnum = eh->e_phnum;
+ }
/* Reuse the existing mapping for the lowest-address LOAD */
if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
this_min = ph->p_vaddr & -PAGE_SIZE;
goto error;
break;
}
- if (!runtime) reclaim_gaps(base, (void *)((char *)buf + eh->e_phoff),
- eh->e_phentsize, eh->e_phnum);
+ if (!runtime) reclaim_gaps(base, ph0, eh->e_phentsize, eh->e_phnum);
dso->map = map;
dso->map_len = map_len;
dso->base = base;
return 0;
}
-static int path_open(const char *name, const char *search, char *buf, size_t buf_size)
+static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
{
- const char *s=search, *z;
- int l, fd;
+ size_t l;
+ int fd;
for (;;) {
- while (*s==':') s++;
- if (!*s) return -1;
- z = strchr(s, ':');
- l = z ? z-s : strlen(s);
- snprintf(buf, buf_size, "%.*s/%s", l, s, name);
+ s += strspn(s, ":\n");
+ l = strcspn(s, ":\n");
+ if (l-1 >= INT_MAX) return -1;
+ if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size)
+ continue;
if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
s += l;
}
{
char buf[2*NAME_MAX+2];
const char *pathname;
- unsigned char *base, *map;
- size_t map_len;
+ unsigned char *map;
struct dso *p, temp_dso = {0};
int fd;
struct stat st;
size_t alloc_size;
int n_th = 0;
+ int is_self = 0;
/* Catch and block attempts to reload the implementation itself */
if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
size_t l = z-name;
for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
if (*rp) {
- if (!ldso->prev) {
- tail->next = ldso;
- ldso->prev = tail;
- tail = ldso->next ? ldso->next : ldso;
+ if (ldd_mode) {
+ /* Track which names have been resolved
+ * and only report each one once. */
+ static unsigned reported;
+ unsigned mask = 1U<<(rp-reserved);
+ if (!(reported & mask)) {
+ reported |= mask;
+ dprintf(1, "\t%s => %s (%p)\n",
+ name, ldso->name,
+ ldso->base);
+ }
}
- return ldso;
+ is_self = 1;
}
}
}
+ if (!strcmp(name, ldso->name)) is_self = 1;
+ if (is_self) {
+ if (!ldso->prev) {
+ tail->next = ldso;
+ ldso->prev = tail;
+ tail = ldso->next ? ldso->next : ldso;
+ }
+ return ldso;
+ }
if (strchr(name, '/')) {
pathname = name;
fd = open(name, O_RDONLY|O_CLOEXEC);
if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
if (fd < 0) {
if (!sys_path) {
- FILE *f = fopen(ETC_LDSO_PATH, "rbe");
+ char *prefix = 0;
+ size_t prefix_len;
+ if (ldso->name[0]=='/') {
+ char *s, *t, *z;
+ for (s=t=z=ldso->name; *s; s++)
+ if (*s=='/') z=t, t=s;
+ prefix_len = z-ldso->name;
+ if (prefix_len < PATH_MAX)
+ prefix = ldso->name;
+ }
+ if (!prefix) {
+ prefix = "";
+ prefix_len = 0;
+ }
+ char etc_ldso_path[prefix_len + 1
+ + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"];
+ snprintf(etc_ldso_path, sizeof etc_ldso_path,
+ "%.*s/etc/ld-musl-" LDSO_ARCH ".path",
+ (int)prefix_len, prefix);
+ FILE *f = fopen(etc_ldso_path, "rbe");
if (f) {
- if (getline(&sys_path, (size_t[1]){0}, f) > 0) {
- size_t l = strlen(sys_path);
- if (l && sys_path[l-1]=='\n')
- sys_path[-1] = 0;
+ if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
+ free(sys_path);
+ sys_path = "";
}
fclose(f);
}
return p;
}
}
- map = map_library(fd, &temp_dso);
+ map = noload ? 0 : map_library(fd, &temp_dso);
close(fd);
if (!map) return 0;
}
p = calloc(1, alloc_size);
if (!p) {
- munmap(map, map_len);
+ munmap(map, temp_dso.map_len);
return 0;
}
memcpy(p, &temp_dso, sizeof temp_dso);
if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
if (p->tls_image) {
if (runtime && !__pthread_self_init()) {
+ munmap(map, p->map_len);
free(p);
- munmap(map, map_len);
return 0;
}
p->tls_id = ++tls_cnt;
p->prev = tail;
tail = p;
- if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, base);
+ if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);
return p;
}
snprintf(errbuf, sizeof errbuf,
"Error loading shared library %s: %m (needed by %s)",
p->strings + p->dynv[i+1], p->name);
- if (runtime) longjmp(rtld_fail, 1);
+ if (runtime) longjmp(*rtld_fail, 1);
dprintf(2, "%s\n", errbuf);
ldso_fail = 1;
continue;
}
if (runtime) {
tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
- if (!tmp) longjmp(rtld_fail, 1);
+ if (!tmp) longjmp(*rtld_fail, 1);
tmp[ndeps++] = dep;
tmp[ndeps] = 0;
*deps = tmp;
for (p=fini_head; p; p=p->fini_next) {
if (!p->constructed) continue;
decode_vec(p->dynv, dyn, DYN_CNT);
- ((void (*)(void))(p->base + dyn[DT_FINI]))();
+ if (dyn[0] & (1<<DT_FINI_ARRAY)) {
+ size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
+ size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n;
+ while (n--) ((void (*)(void))*--fn)();
+ }
+#ifndef NO_LEGACY_INITFINI
+ if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
+ ((void (*)(void))(p->base + dyn[DT_FINI]))();
+#endif
}
}
if (p->constructed) continue;
p->constructed = 1;
decode_vec(p->dynv, dyn, DYN_CNT);
- if (dyn[0] & (1<<DT_FINI)) {
+ if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
p->fini_next = fini_head;
fini_head = p;
}
- if (dyn[0] & (1<<DT_INIT))
+#ifndef NO_LEGACY_INITFINI
+ if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
((void (*)(void))(p->base + dyn[DT_INIT]))();
+#endif
+ if (dyn[0] & (1<<DT_INIT_ARRAY)) {
+ size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
+ size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]);
+ while (n--) ((void (*)(void))*fn++)();
+ }
+ if (!need_locking && libc.threads_minus_1) {
+ need_locking = 1;
+ pthread_mutex_lock(&init_fini_lock);
+ }
}
if (need_locking) pthread_mutex_unlock(&init_fini_lock);
}
void *__tls_get_addr(size_t *v)
{
pthread_t self = __pthread_self();
- if (self->dtv && v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]])
+ if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]])
return (char *)self->dtv[v[0]]+v[1];
/* Block signals to make accessing new TLS async-signal-safe */
sigset_t set;
pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set);
- if (self->dtv && v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) {
+ if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) {
pthread_sigmask(SIG_SETMASK, &set, 0);
return (char *)self->dtv[v[0]]+v[1];
}
for (p=head; p->tls_id != v[0]; p=p->next);
/* Get new DTV space from new DSO if needed */
- if (!self->dtv || v[0] > (size_t)self->dtv[0]) {
+ if (v[0] > (size_t)self->dtv[0]) {
void **newdtv = p->new_dtv +
(v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
- if (self->dtv) memcpy(newdtv, self->dtv,
+ memcpy(newdtv, self->dtv,
((size_t)self->dtv[0]+1) * sizeof(void *));
newdtv[0] = (void *)v[0];
self->dtv = newdtv;
char *env_preload=0;
size_t vdso_base;
size_t *auxv;
+ char **envp = argv+argc+1;
/* Find aux vector just past environ[] */
for (i=argc+1; argv[i]; i++)
lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
find_map_range(lib->phdr, ehdr->e_phnum, ehdr->e_phentsize, lib);
lib->dynv = (void *)(lib->base + find_dyn(lib->phdr,
- ehdr->e_phnum, ehdr->e_phentsize));
+ ehdr->e_phnum, ehdr->e_phentsize));
decode_dyn(lib);
if (aux[AT_PHDR]) {
close(fd);
lib->name = ldname;
app->name = argv[0];
- app->phnum = ehdr->e_phnum;
- app->phdr = (void *)(app->base + ehdr->e_phoff);
- aux[AT_ENTRY] = ehdr->e_entry;
+ aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
+ /* Find the name that would have been used for the dynamic
+ * linker had ldd not taken its place. */
+ if (ldd_mode) {
+ for (i=0; i<app->phnum; i++) {
+ if (app->phdr[i].p_type == PT_INTERP)
+ lib->name = (void *)(app->base
+ + app->phdr[i].p_vaddr);
+ }
+ dprintf(1, "\t%s (%p)\n", lib->name, lib->base);
+ }
}
if (app->tls_size) {
app->tls_id = tls_cnt = 1;
tls_align = MAXP2(tls_align, app->tls_align);
}
app->global = 1;
- app->constructed = 1;
decode_dyn(app);
/* Attach to vdso, if provided by the kernel */
if (phdr->p_type == PT_LOAD)
vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
}
- vdso->name = vdso->shortname = "linux-gate.so.1";
+ vdso->name = "";
+ vdso->shortname = "linux-gate.so.1";
vdso->global = 1;
decode_dyn(vdso);
vdso->prev = lib;
_dl_debug_state();
if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]);
-
+ __init_libc(envp, argv[0]);
atexit(do_fini);
+ errno = 0;
do_init_fini(tail);
- errno = 0;
return (void *)aux[AT_ENTRY];
}
size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
size_t i;
int cs;
+ jmp_buf jb;
if (!file) return head;
orig_tls_offset = tls_offset;
orig_tls_align = tls_align;
orig_tail = tail;
+ noload = mode & RTLD_NOLOAD;
- if (setjmp(rtld_fail)) {
+ rtld_fail = &jb;
+ if (setjmp(*rtld_fail)) {
/* Clean up anything new that was (partially) loaded */
if (p && p->deps) for (i=0; p->deps[i]; i++)
if (p->deps[i]->global < 0)
} else p = load_library(file);
if (!p) {
- snprintf(errbuf, sizeof errbuf,
- "Error loading shared library %s: %m", file);
+ snprintf(errbuf, sizeof errbuf, noload ?
+ "Library %s is not already loaded" :
+ "Error loading shared library %s: %m",
+ file);
errflag = 1;
goto end;
}
return p;
}
+static int invalid_dso_handle(void *h)
+{
+ struct dso *p;
+ for (p=head; p; p=p->next) if (h==p) return 0;
+ snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
+ errflag = 1;
+ return 1;
+}
+
static void *do_dlsym(struct dso *p, const char *s, void *ra)
{
size_t i;
return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
return def.dso->base + def.sym->st_value;
}
+ if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
+ return 0;
if (p->ghashtab) {
gh = gnu_hash(s);
sym = gnu_lookup(s, gh, p);
}
for (; nsym; nsym--, sym++) {
- if (sym->st_shndx && sym->st_value
+ if (sym->st_value
&& (1<<(sym->st_info&0xf) & OK_TYPES)
&& (1<<(sym->st_info>>4) & OK_BINDS)) {
void *symaddr = p->base + sym->st_value;
return ret;
}
#else
+static int invalid_dso_handle(void *h)
+{
+ snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
+ errflag = 1;
+ return 1;
+}
void *dlopen(const char *file, int mode)
{
return 0;
}
#endif
+int __dlinfo(void *dso, int req, void *res)
+{
+ if (invalid_dso_handle(dso)) return -1;
+ if (req != RTLD_DI_LINKMAP) {
+ snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req);
+ errflag = 1;
+ return -1;
+ }
+ *(struct link_map **)res = dso;
+ return 0;
+}
+
char *dlerror()
{
if (!errflag) return 0;
int dlclose(void *p)
{
- return 0;
+ return invalid_dso_handle(p);
}