#include <elf.h>
#include <sys/mman.h>
#include <limits.h>
-#include <stdint.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
-#include <limits.h>
-#include <elf.h>
+#include <link.h>
#include <setjmp.h>
#include <pthread.h>
#include <ctype.h>
#include <dlfcn.h>
#include "pthread_impl.h"
#include "libc.h"
-#undef libc
static int errflag;
static char errbuf[128];
#define R_SYM(x) ((x)>>32)
#endif
+#define MAXP2(a,b) (-(-(a)&-(b)))
+#define ALIGN(x,y) ((x)+(y)-1 & -(y))
+
struct debug {
int ver;
void *head;
size_t *dynv;
struct dso *next, *prev;
+ Phdr *phdr;
+ int phnum;
int refcnt;
Sym *syms;
uint32_t *hashtab;
uint32_t *ghashtab;
+ int16_t *versym;
char *strings;
unsigned char *map;
size_t map_len;
signed char global;
char relocated;
char constructed;
- struct dso **deps;
+ char kernel_mapped;
+ struct dso **deps, *needed_by;
+ char *rpath_orig, *rpath;
void *tls_image;
- size_t tls_len, tls_size, tls_align, tls_id;
+ size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
+ size_t relro_start, relro_end;
+ void **new_dtv;
+ unsigned char *new_tls;
+ int new_dtv_idx, new_tls_idx;
+ struct dso *fini_next;
char *shortname;
char buf[];
};
+struct symdef {
+ Sym *sym;
+ struct dso *dso;
+};
+
#include "reloc.h"
void __init_ssp(size_t *);
-void *__install_initial_tls(void *);
+int __init_tp(void *);
+void __init_libc(char **, char *);
+
+const char *__libc_get_version(void);
-static struct dso *head, *tail, *libc;
-static char *env_path, *sys_path, *r_path;
-static int rtld_used;
+static struct dso *head, *tail, *ldso, *fini_head;
+static char *env_path, *sys_path;
+static unsigned long long gencnt;
static int ssp_used;
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 *auxv;
-static size_t tls_cnt, tls_size;
+static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t);
+static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
+static long long builtin_tls[(sizeof(struct pthread) + 64)/sizeof(long long)];
struct debug *_dl_debug_addr = &debug;
-#define AUX_CNT 24
+#define AUX_CNT 38
#define DYN_CNT 34
static void decode_vec(size_t *v, size_t *a, size_t cnt)
uint32_t *hashtab = dso->hashtab;
char *strings = dso->strings;
for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
- if (!strcmp(s, strings+syms[i].st_name))
+ if ((!dso->versym || dso->versym[i] >= 0)
+ && (!strcmp(s, strings+syms[i].st_name)))
return syms+i;
}
return 0;
static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
{
- Sym *sym;
- char *strings;
+ Sym *syms = dso->syms;
+ char *strings = dso->strings;
uint32_t *hashtab = dso->ghashtab;
uint32_t nbuckets = hashtab[0];
uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
uint32_t h2;
uint32_t *hashval;
- uint32_t n = buckets[h1 % nbuckets];
+ uint32_t i = buckets[h1 % nbuckets];
- if (!n) return 0;
+ if (!i) return 0;
- strings = dso->strings;
- sym = dso->syms + n;
- hashval = buckets + nbuckets + (n - hashtab[1]);
+ hashval = buckets + nbuckets + (i - hashtab[1]);
- for (h1 |= 1; ; sym++) {
+ for (h1 |= 1; ; i++) {
h2 = *hashval++;
- if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
- return sym;
+ if ((!dso->versym || dso->versym[i] >= 0)
+ && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name))
+ return syms+i;
if (h2 & 1) break;
}
return 0;
}
-#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON)
-#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
+#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 | 1<<STB_GNU_UNIQUE)
-static void *find_sym(struct dso *dso, const char *s, int need_def)
+static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
{
uint32_t h = 0, gh = 0;
- void *def = 0;
+ struct symdef def = {0};
if (dso->ghashtab) {
gh = gnu_hash(s);
- if (gh == 0xf9040207 && !strcmp(s, "dlopen")) rtld_used = 1;
- if (gh == 0xf4dc4ae && !strcmp(s, "dlsym")) rtld_used = 1;
if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
} else {
h = sysv_hash(s);
- if (h == 0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
- if (h == 0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
}
for (; dso; dso=dso->next) {
if (!h) h = sysv_hash(s);
sym = sysv_lookup(s, h, dso);
}
- if (sym && (!need_def || sym->st_shndx) && sym->st_value
- && (1<<(sym->st_info&0xf) & OK_TYPES)
- && (1<<(sym->st_info>>4) & OK_BINDS)) {
- if (def && sym->st_info>>4 == STB_WEAK) continue;
- def = dso->base + sym->st_value;
- if (sym->st_info>>4 == STB_GLOBAL) break;
- }
+ if (!sym) continue;
+ if (!sym->st_shndx)
+ if (need_def || (sym->st_info&0xf) == STT_TLS)
+ continue;
+ if (!sym->st_value)
+ if ((sym->st_info&0xf) != STT_TLS)
+ continue;
+ if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
+ if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
+
+ if (def.sym && sym->st_info>>4 == STB_WEAK) continue;
+ def.sym = sym;
+ def.dso = dso;
+ if (sym->st_info>>4 == STB_GLOBAL) break;
}
return def;
}
char *strings = dso->strings;
Sym *sym;
const char *name;
- size_t sym_val, sym_size;
- size_t *reloc_addr;
void *ctx;
int type;
int sym_index;
+ struct symdef def;
for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
- reloc_addr = (void *)(base + rel[0]);
type = R_TYPE(rel[1]);
sym_index = R_SYM(rel[1]);
if (sym_index) {
sym = syms + sym_index;
name = strings + sym->st_name;
ctx = IS_COPY(type) ? head->next : head;
- sym_val = (size_t)find_sym(ctx, name, IS_PLT(type));
- if (!sym_val && sym->st_info>>4 != STB_WEAK) {
+ def = find_sym(ctx, name, IS_PLT(type));
+ if (!def.sym && (sym->st_shndx != SHN_UNDEF
+ || sym->st_info>>4 != STB_WEAK)) {
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;
}
- sym_size = sym->st_size;
} else {
- sym_val = sym_size = 0;
+ sym = 0;
+ def.sym = 0;
+ def.dso = 0;
}
- do_single_reloc(reloc_addr, type, sym_val, sym_size, base, rel[2]);
+ do_single_reloc(dso, base, (void *)(base + rel[0]), type,
+ stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def,
+ def.sym?(size_t)(def.dso->base+def.sym->st_value):0);
}
}
* and "donate" them to the heap by setting up minimal malloc
* structures and then freeing them. */
-static void reclaim(unsigned char *base, size_t start, size_t end)
+static void reclaim(struct dso *dso, size_t start, size_t end)
{
size_t *a, *z;
+ if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end;
+ if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start;
start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
if (start>end || end-start < 4*sizeof(size_t)) return;
- a = (size_t *)(base + start);
- z = (size_t *)(base + end);
+ a = (size_t *)(dso->base + start);
+ z = (size_t *)(dso->base + end);
a[-2] = 1;
a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
z[1] = 1;
free(a);
}
-static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
+static void reclaim_gaps(struct dso *dso, Phdr *ph, size_t phent, size_t phcnt)
{
for (; phcnt--; ph=(void *)((char *)ph+phent)) {
if (ph->p_type!=PT_LOAD) continue;
if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
- reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
- reclaim(base, ph->p_vaddr+ph->p_memsz,
+ reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
+ reclaim(dso, ph->p_vaddr+ph->p_memsz,
ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
}
}
static void *map_library(int fd, struct dso *dso)
{
Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
+ void *allocated_buf=0;
size_t phsize;
size_t addr_min=SIZE_MAX, addr_max=0, map_len;
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;
+ unsigned char *map=MAP_FAILED, *base;
+ size_t dyn=0;
size_t tls_image=0;
size_t i;
ssize_t l = read(fd, buf, sizeof buf);
- if (l<sizeof *eh) return 0;
eh = buf;
+ if (l<0) return 0;
+ if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC))
+ goto noexec;
phsize = eh->e_phentsize * eh->e_phnum;
- if (phsize + sizeof *eh > l) return 0;
- if (eh->e_phoff + phsize > l) {
+ if (phsize > sizeof buf - sizeof *eh) {
+ allocated_buf = malloc(phsize);
+ if (!allocated_buf) return 0;
+ l = pread(fd, allocated_buf, phsize, eh->e_phoff);
+ if (l < 0) goto error;
+ if (l != phsize) goto noexec;
+ ph = ph0 = allocated_buf;
+ } else 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;
+ if (l < 0) goto error;
+ if (l != phsize) goto noexec;
+ ph = ph0 = (void *)(buf + 1);
+ } else {
+ ph = ph0 = (void *)((char *)buf + eh->e_phoff);
}
- ph = (void *)((char *)buf + eh->e_phoff);
for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
if (ph->p_type == PT_DYNAMIC)
dyn = ph->p_vaddr;
- if (ph->p_type == PT_TLS) {
+ else if (ph->p_type == PT_TLS) {
tls_image = ph->p_vaddr;
dso->tls_align = ph->p_align;
dso->tls_len = ph->p_filesz;
dso->tls_size = ph->p_memsz;
+ } else if (ph->p_type == PT_GNU_RELRO) {
+ dso->relro_start = ph->p_vaddr & -PAGE_SIZE;
+ dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
}
if (ph->p_type != PT_LOAD) continue;
if (ph->p_vaddr < addr_min) {
addr_max = ph->p_vaddr+ph->p_memsz;
}
}
- if (!dyn) return 0;
+ if (!dyn) goto noexec;
addr_max += PAGE_SIZE-1;
addr_max &= -PAGE_SIZE;
addr_min &= -PAGE_SIZE;
* use the invalid part; we just need to reserve the right
* 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 (map==MAP_FAILED) goto error;
+ /* 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);
dso->map = map;
dso->map_len = map_len;
dso->base = base;
dso->dynv = (void *)(base+dyn);
if (dso->tls_size) dso->tls_image = (void *)(base+tls_image);
+ if (!runtime) reclaim_gaps(dso, ph0, eh->e_phentsize, eh->e_phnum);
+ free(allocated_buf);
return map;
+noexec:
+ errno = ENOEXEC;
error:
- munmap(map, map_len);
+ if (map!=MAP_FAILED) munmap(map, map_len);
+ free(allocated_buf);
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;
}
}
+static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
+{
+ size_t n, l;
+ const char *s, *t, *origin;
+ char *d;
+ if (p->rpath) return 0;
+ if (!p->rpath_orig) return -1;
+ if (!strchr(p->rpath_orig, '$')) {
+ p->rpath = p->rpath_orig;
+ return 0;
+ }
+ n = 0;
+ s = p->rpath_orig;
+ while ((t=strchr(s, '$'))) {
+ if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9))
+ return -1;
+ s = t+1;
+ n++;
+ }
+ if (n > SSIZE_MAX/PATH_MAX) return -1;
+
+ if (p->kernel_mapped) {
+ /* $ORIGIN searches cannot be performed for the main program
+ * when it is suid/sgid/AT_SECURE. This is because the
+ * pathname is under the control of the caller of execve.
+ * For libraries, however, $ORIGIN can be processed safely
+ * since the library's pathname came from a trusted source
+ * (either system paths or a call to dlopen). */
+ if (libc.secure)
+ return -1;
+ l = readlink("/proc/self/exe", buf, buf_size);
+ if (l >= buf_size)
+ return -1;
+ buf[l] = 0;
+ origin = buf;
+ } else {
+ origin = p->name;
+ }
+ t = strrchr(origin, '/');
+ l = t ? t-origin : 0;
+ p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1);
+ if (!p->rpath) return -1;
+
+ d = p->rpath;
+ s = p->rpath_orig;
+ while ((t=strchr(s, '$'))) {
+ memcpy(d, s, t-s);
+ d += t-s;
+ memcpy(d, origin, l);
+ d += l;
+ /* It was determined previously that the '$' is followed
+ * either by "ORIGIN" or "{ORIGIN}". */
+ s = t + 7 + 2*(t[1]=='{');
+ }
+ strcpy(d, s);
+ return 0;
+}
+
static void decode_dyn(struct dso *p)
{
size_t dyn[DYN_CNT] = {0};
p->strings = (void *)(p->base + dyn[DT_STRTAB]);
if (dyn[0]&(1<<DT_HASH))
p->hashtab = (void *)(p->base + dyn[DT_HASH]);
+ if (dyn[0]&(1<<DT_RPATH))
+ p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]);
if (search_vec(p->dynv, dyn, DT_GNU_HASH))
p->ghashtab = (void *)(p->base + *dyn);
+ if (search_vec(p->dynv, dyn, DT_VERSYM))
+ p->versym = (void *)(p->base + *dyn);
}
-static struct dso *load_library(const char *name)
+static struct dso *load_library(const char *name, struct dso *needed_by)
{
char buf[2*NAME_MAX+2];
const char *pathname;
- unsigned char *base, *map;
- size_t dyno, 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') {
char *z = strchr(name, '.');
if (z) {
size_t l = z-name;
- for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
+ for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1);
if (*rp) {
- if (!libc->prev) {
- tail->next = libc;
- libc->prev = tail;
- tail = libc->next ? libc->next : libc;
+ 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 libc;
+ 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 (strlen(name) > NAME_MAX) return 0;
fd = -1;
- if (r_path) fd = path_open(name, r_path, buf, sizeof buf);
- if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
+ if (env_path) fd = path_open(name, env_path, buf, sizeof buf);
+ for (p=needed_by; fd < 0 && p; p=p->needed_by)
+ if (!fixup_rpath(p, buf, sizeof buf))
+ fd = path_open(name, p->rpath, 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)
- sys_path[strlen(sys_path)-1]=0;
+ if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
+ free(sys_path);
+ sys_path = "";
+ }
fclose(f);
+ } else if (errno != ENOENT) {
+ sys_path = "";
}
}
- if (sys_path) fd = path_open(name, sys_path, buf, sizeof buf);
- else fd = path_open(name, "/lib:/usr/local/lib:/usr/lib", buf, sizeof buf);
+ if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
+ fd = path_open(name, sys_path, buf, sizeof buf);
}
pathname = buf;
}
/* If this library was previously loaded with a
* pathname but a search found the same inode,
* setup its shortname so it can be found by name. */
- if (!p->shortname) p->shortname = strrchr(p->name, '/')+1;
+ if (!p->shortname && pathname != name)
+ p->shortname = strrchr(p->name, '/')+1;
close(fd);
p->refcnt++;
return p;
}
}
- map = map_library(fd, &temp_dso);
+ map = noload ? 0 : map_library(fd, &temp_dso);
close(fd);
if (!map) return 0;
- p = malloc(sizeof *p + strlen(pathname) + 1);
+
+ /* Allocate storage for the new DSO. When there is TLS, this
+ * storage must include a reservation for all pre-existing
+ * threads to obtain copies of both the new TLS, and an
+ * extended DTV capable of storing an additional slot for
+ * the newly-loaded DSO. */
+ alloc_size = sizeof *p + strlen(pathname) + 1;
+ if (runtime && temp_dso.tls_image) {
+ size_t per_th = temp_dso.tls_size + temp_dso.tls_align
+ + sizeof(void *) * (tls_cnt+3);
+ n_th = libc.threads_minus_1 + 1;
+ if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX;
+ else alloc_size += n_th * per_th;
+ }
+ 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);
decode_dyn(p);
- if (p->tls_image) {
- p->tls_id = ++tls_cnt;
- tls_size += p->tls_size + p->tls_align + 8*sizeof(size_t) - 1
- & -4*sizeof(size_t);
- }
p->dev = st.st_dev;
p->ino = st.st_ino;
p->refcnt = 1;
+ p->needed_by = needed_by;
p->name = p->buf;
strcpy(p->name, pathname);
/* Add a shortname only if name arg was not an explicit pathname. */
if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
+ if (p->tls_image) {
+ if (runtime && !libc.has_thread_pointer) {
+ munmap(map, p->map_len);
+ free(p);
+ errno = ENOSYS;
+ return 0;
+ }
+ p->tls_id = ++tls_cnt;
+ tls_align = MAXP2(tls_align, p->tls_align);
+#ifdef TLS_ABOVE_TP
+ p->tls_offset = tls_offset + ( (tls_align-1) &
+ -(tls_offset + (uintptr_t)p->tls_image) );
+ tls_offset += p->tls_size;
+#else
+ tls_offset += p->tls_size + p->tls_align - 1;
+ tls_offset -= (tls_offset + (uintptr_t)p->tls_image)
+ & (p->tls_align-1);
+ p->tls_offset = tls_offset;
+#endif
+ p->new_dtv = (void *)(-sizeof(size_t) &
+ (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
+ p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
+ }
tail->next = p;
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;
}
size_t i, ndeps=0;
struct dso ***deps = &p->deps, **tmp, *dep;
for (; p; p=p->next) {
- for (i=0; p->dynv[i]; i+=2) {
- if (p->dynv[i] != DT_RPATH) continue;
- r_path = (void *)(p->strings + p->dynv[i+1]);
- }
for (i=0; p->dynv[i]; i+=2) {
if (p->dynv[i] != DT_NEEDED) continue;
- dep = load_library(p->strings + p->dynv[i+1]);
+ dep = load_library(p->strings + p->dynv[i+1], p);
if (!dep) {
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;
}
}
- r_path = 0;
}
}
for (z=s; *z && !isspace(*z); z++);
tmp = *z;
*z = 0;
- load_library(s);
+ load_library(s, 0);
*z = tmp;
}
}
2+(dyn[DT_PLTREL]==DT_RELA));
do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
- p->relocated = 1;
- }
-}
-static void free_all(struct dso *p)
-{
- struct dso *n;
- while (p) {
- n = p->next;
- if (p->map && p!=libc && p!=head) free(p);
- p = n;
+ if (p->relro_start != p->relro_end &&
+ mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) {
+ snprintf(errbuf, sizeof errbuf,
+ "Error relocating %s: RELRO protection failed",
+ p->name);
+ if (runtime) longjmp(*rtld_fail, 1);
+ dprintf(2, "%s\n", errbuf);
+ ldso_fail = 1;
+ }
+
+ p->relocated = 1;
}
}
{
size_t min_addr = -1, max_addr = 0;
for (; cnt--; ph = (void *)((char *)ph + stride)) {
+ if (ph->p_type == PT_GNU_RELRO) {
+ p->relro_start = ph->p_vaddr & -PAGE_SIZE;
+ p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
+ }
if (ph->p_type != PT_LOAD) continue;
if (ph->p_vaddr < min_addr)
min_addr = ph->p_vaddr;
p->map_len = max_addr - min_addr;
}
+static void do_fini()
+{
+ struct dso *p;
+ size_t dyn[DYN_CNT] = {0};
+ for (p=fini_head; p; p=p->fini_next) {
+ if (!p->constructed) continue;
+ decode_vec(p->dynv, dyn, DYN_CNT);
+ 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
+ }
+}
+
static void do_init_fini(struct dso *p)
{
size_t dyn[DYN_CNT] = {0};
+ int need_locking = libc.threads_minus_1;
+ /* Allow recursive calls that arise when a library calls
+ * dlopen from one of its constructors, but block any
+ * other threads until all ctors have finished. */
+ if (need_locking) pthread_mutex_lock(&init_fini_lock);
for (; p; p=p->prev) {
- if (p->constructed) return;
+ if (p->constructed) continue;
+ p->constructed = 1;
decode_vec(p->dynv, dyn, DYN_CNT);
- if (dyn[0] & (1<<DT_FINI))
- atexit((void (*)(void))(p->base + dyn[DT_FINI]));
- if (dyn[0] & (1<<DT_INIT))
+ if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
+ p->fini_next = fini_head;
+ fini_head = p;
+ }
+#ifndef NO_LEGACY_INITFINI
+ if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
((void (*)(void))(p->base + dyn[DT_INIT]))();
- p->constructed = 1;
+#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 _dl_debug_state(void)
{
}
-void *__copy_tls(unsigned char *mem, size_t cnt)
+void __reset_tls()
{
+ pthread_t self = __pthread_self();
struct dso *p;
+ for (p=head; p; p=p->next) {
+ if (!p->tls_id || !self->dtv[p->tls_id]) continue;
+ memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len);
+ memset((char *)self->dtv[p->tls_id]+p->tls_len, 0,
+ p->tls_size - p->tls_len);
+ if (p->tls_id == (size_t)self->dtv[0]) break;
+ }
+}
+
+void *__copy_tls(unsigned char *mem)
+{
+ pthread_t td;
+ struct dso *p;
+
void **dtv = (void *)mem;
- dtv[0] = (void *)cnt;
- mem = (void *)(dtv + cnt + 1);
- for (p=tail; p; p=p->prev) {
- if (p->tls_id-1 >= cnt) continue;
- mem += -p->tls_len & (4*sizeof(size_t)-1);
- mem += ((uintptr_t)p->tls_image - (uintptr_t)mem)
- & (p->tls_align-1);
- dtv[p->tls_id] = mem;
- memcpy(mem, p->tls_image, p->tls_len);
- mem += p->tls_size;
+ dtv[0] = (void *)tls_cnt;
+ if (!tls_cnt) {
+ td = (void *)(dtv+1);
+ td->dtv = dtv;
+ return td;
+ }
+
+#ifdef TLS_ABOVE_TP
+ mem += sizeof(void *) * (tls_cnt+1);
+ mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1);
+ td = (pthread_t)mem;
+ mem += sizeof(struct pthread);
+
+ for (p=head; p; p=p->next) {
+ if (!p->tls_id) continue;
+ dtv[p->tls_id] = mem + p->tls_offset;
+ memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
+ }
+#else
+ mem += libc.tls_size - sizeof(struct pthread);
+ mem -= (uintptr_t)mem & (tls_align-1);
+ td = (pthread_t)mem;
+
+ for (p=head; p; p=p->next) {
+ if (!p->tls_id) continue;
+ dtv[p->tls_id] = mem - p->tls_offset;
+ memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
}
- ((pthread_t)mem)->dtv = dtv;
- return mem;
+#endif
+ td->dtv = dtv;
+ return td;
}
-void *__tls_get_addr(size_t *p)
+void *__tls_get_addr(size_t *v)
{
pthread_t self = __pthread_self();
- if ((size_t)self->dtv[0] < p[0]) {
- // FIXME: obtain new DTV and TLS from the DSO
- a_crash();
+ 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 (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];
}
- return (char *)self->dtv[p[0]] + p[1];
+
+ /* This is safe without any locks held because, if the caller
+ * is able to request the Nth entry of the DTV, the DSO list
+ * must be valid at least that far out and it was synchronized
+ * at program startup or by an already-completed call to dlopen. */
+ struct dso *p;
+ for (p=head; p->tls_id != v[0]; p=p->next);
+
+ /* Get new DTV space from new DSO if needed */
+ 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);
+ memcpy(newdtv, self->dtv,
+ ((size_t)self->dtv[0]+1) * sizeof(void *));
+ newdtv[0] = (void *)v[0];
+ self->dtv = newdtv;
+ }
+
+ /* Get new TLS memory from new DSO */
+ unsigned char *mem = p->new_tls +
+ (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1);
+ mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1);
+ self->dtv[v[0]] = mem;
+ memcpy(mem, p->tls_image, p->tls_len);
+ pthread_sigmask(SIG_SETMASK, &set, 0);
+ return mem + v[1];
+}
+
+static void update_tls_size()
+{
+ libc.tls_size = ALIGN(
+ (1+tls_cnt) * sizeof(void *) +
+ tls_offset +
+ sizeof(struct pthread) +
+ tls_align * 2,
+ tls_align);
}
void *__dynlink(int argc, char **argv)
struct dso *const vdso = builtin_dsos+2;
char *env_preload=0;
size_t vdso_base;
+ size_t *auxv;
+ char **envp = argv+argc+1;
+ void *initial_tls;
/* Find aux vector just past environ[] */
for (i=argc+1; argv[i]; i++)
|| aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
env_path = 0;
env_preload = 0;
+ libc.secure = 1;
}
+ libc.page_size = aux[AT_PAGESZ];
/* If the dynamic linker was invoked as a program itself, AT_BASE
* will not be set. In that case, we assume the base address is
lib->base = (void *)aux[AT_BASE];
lib->name = lib->shortname = "libc.so";
lib->global = 1;
+ lib->kernel_mapped = 1;
ehdr = (void *)lib->base;
- find_map_range((void *)(aux[AT_BASE]+ehdr->e_phoff),
- ehdr->e_phnum, ehdr->e_phentsize, lib);
- lib->dynv = (void *)(lib->base + find_dyn(
- (void *)(aux[AT_BASE]+ehdr->e_phoff),
+ lib->phnum = ehdr->e_phnum;
+ 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));
decode_dyn(lib);
size_t interp_off = 0;
size_t tls_image = 0;
/* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
- phdr = (void *)aux[AT_PHDR];
+ app->phdr = phdr = (void *)aux[AT_PHDR];
+ app->phnum = aux[AT_PHNUM];
for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
if (phdr->p_type == PT_PHDR)
app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
}
if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
if (interp_off) lib->name = (char *)app->base + interp_off;
- app->name = argv[0];
+ if ((aux[0] & (1UL<<AT_EXECFN))
+ && strncmp((char *)aux[AT_EXECFN], "/proc/", 6))
+ app->name = (char *)aux[AT_EXECFN];
+ else
+ app->name = argv[0];
+ app->kernel_mapped = 1;
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
find_map_range((void *)aux[AT_PHDR],
} else {
int fd;
char *ldname = argv[0];
- size_t dyno, l = strlen(ldname);
+ size_t l = strlen(ldname);
if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
*argv++ = (void *)-1;
if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
if (!argv[0]) {
- dprintf(2, "musl libc/dynamic program loader\n");
- dprintf(2, "usage: %s pathname%s\n", ldname,
+ dprintf(2, "musl libc\n"
+ "Version %s\n"
+ "Dynamic Program Loader\n"
+ "Usage: %s [--] pathname%s\n",
+ __libc_get_version(), ldname,
ldd_mode ? "" : " [args]");
_exit(1);
}
close(fd);
lib->name = ldname;
app->name = argv[0];
- 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;
- tls_size += app->tls_size+app->tls_align + 8*sizeof(size_t)-1
- & -4*sizeof(size_t);
+ app->tls_id = tls_cnt = 1;
+#ifdef TLS_ABOVE_TP
+ app->tls_offset = 0;
+ tls_offset = app->tls_size
+ + ( -((uintptr_t)app->tls_image + app->tls_size)
+ & (app->tls_align-1) );
+#else
+ tls_offset = app->tls_offset = app->tls_size
+ + ( -((uintptr_t)app->tls_image + app->tls_size)
+ & (app->tls_align-1) );
+#endif
+ 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 (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
ehdr = (void *)vdso_base;
- phdr = (void *)(vdso_base + ehdr->e_phoff);
+ vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
+ vdso->phnum = ehdr->e_phnum;
for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
if (phdr->p_type == PT_DYNAMIC)
vdso->dynv = (void *)(vdso_base + phdr->p_offset);
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;
* restore the initial chain in preparation for loading third
* party libraries (preload/needed). */
head = tail = app;
- libc = lib;
+ ldso = lib;
app->next = lib;
reloc_all(lib);
app->next = 0;
/* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
/* Donate unused parts of app and library mapping to malloc */
- reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
+ reclaim_gaps(app, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
ehdr = (void *)lib->base;
- reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff),
+ reclaim_gaps(lib, (void *)(lib->base+ehdr->e_phoff),
ehdr->e_phentsize, ehdr->e_phnum);
/* Load preload/needed libraries, add their symbols to the global
if (env_preload) load_preload(env_preload);
load_deps(app);
make_global(app);
+
+#ifndef DYNAMIC_IS_RO
+ for (i=0; app->dynv[i]; i+=2)
+ if (app->dynv[i]==DT_DEBUG)
+ app->dynv[i+1] = (size_t)&debug;
+#endif
+
reloc_all(app->next);
reloc_all(app);
+ update_tls_size();
+ if (libc.tls_size > sizeof builtin_tls) {
+ initial_tls = calloc(libc.tls_size, 1);
+ if (!initial_tls) {
+ dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
+ argv[0], libc.tls_size);
+ _exit(127);
+ }
+ } else {
+ initial_tls = builtin_tls;
+ }
+ if (__init_tp(__copy_tls(initial_tls)) < 0 && tls_cnt) {
+ dprintf(2, "%s: Thread-local storage not supported by kernel.\n", argv[0]);
+ _exit(127);
+ }
+
if (ldso_fail) _exit(127);
if (ldd_mode) _exit(0);
* all memory used by the dynamic linker. */
runtime = 1;
-#ifndef DYNAMIC_IS_RO
- for (i=0; app->dynv[i]; i+=2)
- if (app->dynv[i]==DT_DEBUG)
- app->dynv[i+1] = (size_t)&debug;
-#endif
debug.ver = 1;
debug.bp = _dl_debug_state;
debug.head = head;
debug.state = 0;
_dl_debug_state();
- tls_size += sizeof(struct pthread) + 4*sizeof(size_t);
- __libc.tls_size = tls_size;
- __libc.tls_cnt = tls_cnt;
- if (tls_cnt) {
- void *mem = mmap(0, __libc.tls_size, PROT_READ|PROT_WRITE,
- MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
- if (mem==MAP_FAILED ||
- !__install_initial_tls(__copy_tls(mem, tls_cnt))) {
- dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
- argv[0], tls_size);
- _exit(127);
- }
- }
- if (ssp_used) __init_ssp(auxv);
-
+ if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]);
+ __init_libc(envp, argv[0]);
+ atexit(do_fini);
+ errno = 0;
do_init_fini(tail);
- if (!rtld_used) {
- free_all(head);
- free(sys_path);
- reclaim((void *)builtin_dsos, 0, sizeof builtin_dsos);
- }
-
- errno = 0;
return (void *)aux[AT_ENTRY];
}
void *dlopen(const char *file, int mode)
{
- struct dso *volatile p, *orig_tail = tail, *next;
+ struct dso *volatile p, *orig_tail, *next;
+ size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
size_t i;
int cs;
+ jmp_buf jb;
if (!file) return head;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
pthread_rwlock_wrlock(&lock);
+ __inhibit_ptc();
+
+ p = 0;
+ orig_tls_cnt = tls_cnt;
+ 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->deps) for (i=0; p->deps[i]; i++)
+ if (p && p->deps) for (i=0; p->deps[i]; i++)
if (p->deps[i]->global < 0)
p->deps[i]->global = 0;
for (p=orig_tail->next; p; p=next) {
free(p->deps);
free(p);
}
+ tls_cnt = orig_tls_cnt;
+ tls_offset = orig_tls_offset;
+ tls_align = orig_tls_align;
tail = orig_tail;
tail->next = 0;
p = 0;
errflag = 1;
goto end;
- } else p = load_library(file);
+ } else p = load_library(file, head);
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;
}
p->global = 1;
}
- if (ssp_used) __init_ssp(auxv);
+ update_tls_size();
- _dl_debug_state();
+ if (ssp_used) __init_ssp(libc.auxv);
- do_init_fini(tail);
+ _dl_debug_state();
+ orig_tail = tail;
end:
+ __release_ptc();
+ if (p) gencnt++;
pthread_rwlock_unlock(&lock);
+ if (p) do_init_fini(orig_tail);
pthread_setcancelstate(cs, 0);
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;
uint32_t h = 0, gh = 0;
Sym *sym;
- if (p == RTLD_NEXT) {
- for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
- if (!p) p=head;
- void *res = find_sym(p->next, s, 0);
- if (!res) goto failed;
- return res;
- }
- if (p == head || p == RTLD_DEFAULT) {
- void *res = find_sym(head, s, 0);
- if (!res) goto failed;
- return res;
+ if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
+ if (p == RTLD_DEFAULT) {
+ p = head;
+ } else if (p == RTLD_NEXT) {
+ for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
+ if (!p) p=head;
+ p = p->next;
+ }
+ struct symdef def = find_sym(p, s, 0);
+ if (!def.sym) goto failed;
+ if ((def.sym->st_info&0xf) == STT_TLS)
+ 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);
h = sysv_hash(s);
sym = sysv_lookup(s, h, p);
}
+ if (sym && (sym->st_info&0xf) == STT_TLS)
+ return __tls_get_addr((size_t []){p->tls_id, sym->st_value});
if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
return p->base + sym->st_value;
if (p->deps) for (i=0; p->deps[i]; i++) {
if (!h) h = sysv_hash(s);
sym = sysv_lookup(s, h, p->deps[i]);
}
+ if (sym && (sym->st_info&0xf) == STT_TLS)
+ return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value});
if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
return p->deps[i]->base + sym->st_value;
}
return 0;
}
-int __dladdr(void *addr, Dl_info *info)
+int __dladdr(const void *addr, Dl_info *info)
{
struct dso *p;
Sym *sym;
uint32_t *hashval;
buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
sym += p->ghashtab[1];
- for (i = 0; i < p->ghashtab[0]; i++) {
+ for (i = nsym = 0; i < p->ghashtab[0]; i++) {
if (buckets[i] > nsym)
nsym = buckets[i];
}
}
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;
pthread_rwlock_unlock(&lock);
return res;
}
+
+int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
+{
+ struct dso *current;
+ struct dl_phdr_info info;
+ int ret = 0;
+ for(current = head; current;) {
+ info.dlpi_addr = (uintptr_t)current->base;
+ info.dlpi_name = current->name;
+ info.dlpi_phdr = current->phdr;
+ info.dlpi_phnum = current->phnum;
+ info.dlpi_adds = gencnt;
+ info.dlpi_subs = 0;
+ info.dlpi_tls_modid = current->tls_id;
+ info.dlpi_tls_data = current->tls_image;
+
+ ret = (callback)(&info, sizeof (info), data);
+
+ if (ret != 0) break;
+
+ pthread_rwlock_rdlock(&lock);
+ current = current->next;
+ pthread_rwlock_unlock(&lock);
+ }
+ 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;
{
return 0;
}
-int __dladdr (void *addr, Dl_info *info)
+int __dladdr (const void *addr, Dl_info *info)
{
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);
}
projects / musl / blobdiff