diff options
Diffstat (limited to 'src/ldso/dynlink.c')
| -rw-r--r-- | src/ldso/dynlink.c | 93 |
1 files changed, 61 insertions, 32 deletions
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c index ccd526f0..62bfed8e 100644 --- a/src/ldso/dynlink.c +++ b/src/ldso/dynlink.c @@ -21,8 +21,7 @@ #include "libc.h" #include "dynlink.h" -static int errflag; -static char errbuf[128]; +static void error(const char *, ...); #ifdef SHARED @@ -139,17 +138,6 @@ static int search_vec(size_t *v, size_t *r, size_t key) return 1; } -static void error(const char *fmt, ...) -{ - va_list ap; - va_start(ap, fmt); - vsnprintf(errbuf, sizeof errbuf, fmt, ap); - va_end(ap); - if (runtime) longjmp(*rtld_fail, 1); - dprintf(2, "%s\n", errbuf); - ldso_fail = 1; -} - static uint32_t sysv_hash(const char *s0) { const unsigned char *s = (void *)s0; @@ -283,6 +271,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri || sym->st_info>>4 != STB_WEAK)) { error("Error relocating %s: %s: symbol not found", dso->name, name); + if (runtime) longjmp(*rtld_fail, 1); continue; } } else { @@ -347,9 +336,12 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri if (stride<3) addend = reloc_addr[1]; if (runtime && def.dso->tls_id >= static_tls_cnt) { struct td_index *new = malloc(sizeof *new); - if (!new) error( + if (!new) { + error( "Error relocating %s: cannot allocate TLSDESC for %s", dso->name, sym ? name : "(local)" ); + if (runtime) longjmp(*rtld_fail, 1); + } new->next = dso->td_index; dso->td_index = new; new->args[0] = def.dso->tls_id; @@ -370,6 +362,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri default: error("Error relocating %s: unsupported relocation type %d", dso->name, type); + if (runtime) longjmp(*rtld_fail, 1); continue; } } @@ -848,6 +841,7 @@ static void load_deps(struct dso *p) if (!dep) { error("Error loading shared library %s: %m (needed by %s)", p->strings + p->dynv[i+1], p->name); + if (runtime) longjmp(*rtld_fail, 1); continue; } if (runtime) { @@ -917,6 +911,7 @@ static void reloc_all(struct dso *p) mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) { error("Error relocating %s: RELRO protection failed: %m", p->name); + if (runtime) longjmp(*rtld_fail, 1); } p->relocated = 1; @@ -1433,16 +1428,14 @@ void *dlopen(const char *file, int mode) tail = orig_tail; tail->next = 0; p = 0; - errflag = 1; goto end; } else p = load_library(file, head); if (!p) { - snprintf(errbuf, sizeof errbuf, noload ? + error(noload ? "Library %s is not already loaded" : "Error loading shared library %s: %m", file); - errflag = 1; goto end; } @@ -1482,8 +1475,7 @@ 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; + error("Invalid library handle %p", (void *)h); return 1; } @@ -1535,8 +1527,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra) return p->deps[i]->base + sym->st_value; } failed: - errflag = 1; - snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); + error("Symbol not found: %s", s); return 0; } @@ -1639,20 +1630,17 @@ int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void #else static int invalid_dso_handle(void *h) { - snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); - errflag = 1; + error("Invalid library handle %p", (void *)h); return 1; } void *dlopen(const char *file, int mode) { - strcpy(errbuf, "Dynamic loading not supported"); - errflag = 1; + error("Dynamic loading not supported"); return 0; } void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) { - errflag = 1; - snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); + error("Symbol not found: %s", s); return 0; } int __dladdr (const void *addr, Dl_info *info) @@ -1665,8 +1653,7 @@ 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; + error("Unsupported request %d", req); return -1; } *(struct link_map **)res = dso; @@ -1675,12 +1662,54 @@ int __dlinfo(void *dso, int req, void *res) char *dlerror() { - if (!errflag) return 0; - errflag = 0; - return errbuf; + pthread_t self = __pthread_self(); + if (!self->dlerror_flag) return 0; + self->dlerror_flag = 0; + char *s = self->dlerror_buf; + if (s == (void *)-1) + return "Dynamic linker failed to allocate memory for error message"; + else + return s; } int dlclose(void *p) { return invalid_dso_handle(p); } + +void __dl_thread_cleanup(void) +{ + pthread_t self = __pthread_self(); + if (self->dlerror_buf != (void *)-1) + free(self->dlerror_buf); +} + +static void error(const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); +#ifdef SHARED + if (!runtime) { + vdprintf(2, fmt, ap); + dprintf(2, "\n"); + ldso_fail = 1; + va_end(ap); + return; + } +#endif + pthread_t self = __pthread_self(); + if (self->dlerror_buf != (void *)-1) + free(self->dlerror_buf); + size_t len = vsnprintf(0, 0, fmt, ap); + va_end(ap); + char *buf = malloc(len+1); + if (buf) { + va_start(ap, fmt); + vsnprintf(buf, len+1, fmt, ap); + va_end(ap); + } else { + buf = (void *)-1; + } + self->dlerror_buf = buf; + self->dlerror_flag = 1; +} |