X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fldso%2Fdynlink.c;h=98a18bbaf88e8ce22f8059d6c854487190019e45;hp=a6dbaf0187c1dce0a40c1afceea7f01e0f05c6c2;hb=17276be31692880e56c93132e5d85fa9dd6c003f;hpb=0a1c2c1c1755d03d7d3db11df612bbe7c5b69c46

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index a6dbaf01..98a18bba 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -13,6 +13,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <elf.h>
+#include <link.h>
 #include <setjmp.h>
 #include <pthread.h>
 #include <ctype.h>
@@ -56,6 +57,8 @@ struct dso {
 	size_t *dynv;
 	struct dso *next, *prev;
 
+	Phdr *phdr;
+	int phnum;
 	int refcnt;
 	Sym *syms;
 	uint32_t *hashtab;
@@ -88,17 +91,19 @@ struct symdef {
 
 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 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_offset, tls_align = 4*sizeof(size_t);
 static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
 
@@ -250,7 +255,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
 				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;
@@ -305,7 +310,7 @@ static void *map_library(int fd, struct dso *dso)
 	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;
@@ -320,9 +325,10 @@ static void *map_library(int fd, struct dso *dso)
 	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);
 	for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
 		if (ph->p_type == PT_DYNAMIC)
 			dyn = ph->p_vaddr;
@@ -357,9 +363,18 @@ static void *map_library(int fd, struct dso *dso)
 	map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
 	if (map==MAP_FAILED) return 0;
 	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;
@@ -384,8 +399,7 @@ static void *map_library(int fd, struct dso *dso)
 				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;
@@ -397,16 +411,16 @@ error:
 	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;
 	}
@@ -428,8 +442,7 @@ static struct dso *load_library(const char *name)
 {
 	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;
@@ -471,15 +484,36 @@ static struct dso *load_library(const char *name)
 		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)
-						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);
 				}
 			}
-			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;
 	}
@@ -500,7 +534,7 @@ static struct dso *load_library(const char *name)
 			return p;
 		}
 	}
-	map = map_library(fd, &temp_dso);
+	map = noload ? 0 : map_library(fd, &temp_dso);
 	close(fd);
 	if (!map) return 0;
 
@@ -519,7 +553,7 @@ static struct dso *load_library(const char *name)
 	}
 	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);
@@ -533,8 +567,8 @@ static struct dso *load_library(const char *name)
 	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;
@@ -558,7 +592,7 @@ static struct dso *load_library(const char *name)
 	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;
 }
@@ -579,14 +613,14 @@ static void load_deps(struct dso *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;
@@ -663,7 +697,15 @@ static void do_fini()
 	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))
+			((void (*)(void))(p->base + dyn[DT_FINI]))();
+#endif
 	}
 }
 
@@ -679,12 +721,23 @@ static void do_init_fini(struct dso *p)
 		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;
 		}
+#ifndef NO_LEGACY_INITFINI
 		if (dyn[0] & (1<<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);
 }
@@ -732,13 +785,13 @@ void *__copy_tls(unsigned char *mem)
 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];
 	}
@@ -751,10 +804,10 @@ void *__tls_get_addr(size_t *v)
 	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;
@@ -792,6 +845,8 @@ 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;
 
 	/* Find aux vector just past environ[] */
 	for (i=argc+1; argv[i]; i++)
@@ -825,18 +880,19 @@ void *__dynlink(int argc, char **argv)
 	lib->name = lib->shortname = "libc.so";
 	lib->global = 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),
-		ehdr->e_phnum, ehdr->e_phentsize));
+	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);
 
 	if (aux[AT_PHDR]) {
 		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);
@@ -859,7 +915,7 @@ void *__dynlink(int argc, char **argv)
 	} 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;
@@ -884,6 +940,8 @@ void *__dynlink(int argc, char **argv)
 		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;
 	}
 	if (app->tls_size) {
@@ -901,20 +959,21 @@ void *__dynlink(int argc, char **argv)
 		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;
@@ -952,7 +1011,6 @@ void *__dynlink(int argc, char **argv)
 
 	update_tls_size();
 	if (tls_cnt) {
-		struct dso *p;
 		void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
 			MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
 		if (mem==MAP_FAILED ||
@@ -985,11 +1043,11 @@ void *__dynlink(int argc, char **argv)
 	_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];
 }
 
@@ -999,6 +1057,7 @@ void *dlopen(const char *file, int mode)
 	size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
 	size_t i;
 	int cs;
+	jmp_buf jb;
 
 	if (!file) return head;
 
@@ -1011,8 +1070,10 @@ void *dlopen(const char *file, int mode)
 	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)
@@ -1034,8 +1095,10 @@ void *dlopen(const char *file, int mode)
 	} 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;
 	}
@@ -1062,18 +1125,28 @@ void *dlopen(const char *file, int mode)
 
 	update_tls_size();
 
-	if (ssp_used) __init_ssp(auxv);
+	if (ssp_used) __init_ssp(libc.auxv);
 
 	_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;
@@ -1093,6 +1166,8 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
 			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);
@@ -1161,7 +1236,7 @@ int __dladdr(void *addr, Dl_info *info)
 	}
 
 	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;
@@ -1192,7 +1267,39 @@ void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
 	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;
@@ -1207,6 +1314,18 @@ int __dladdr (void *addr, Dl_info *info)
 }
 #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;
@@ -1216,5 +1335,5 @@ char *dlerror()
 
 int dlclose(void *p)
 {
-	return 0;
+	return invalid_dso_handle(p);
 }