diff options
-rw-r--r-- | gnu/usr.bin/ld/rtld/rtld.c | 292 | ||||
-rw-r--r-- | libexec/rtld-aout/rtld.c | 292 |
2 files changed, 410 insertions, 174 deletions
diff --git a/gnu/usr.bin/ld/rtld/rtld.c b/gnu/usr.bin/ld/rtld/rtld.c index 2448f87..6332911 100644 --- a/gnu/usr.bin/ld/rtld/rtld.c +++ b/gnu/usr.bin/ld/rtld/rtld.c @@ -27,7 +27,7 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: rtld.c,v 1.19 1994/12/23 22:31:35 nate Exp $ + * $Id: rtld.c,v 1.20 1995/01/12 19:12:29 joerg Exp $ */ #include <sys/param.h> @@ -73,6 +73,9 @@ struct somap_private { #define RTLD_MAIN 1 #define RTLD_RTLD 2 #define RTLD_DL 4 + unsigned long a_text; /* text size, if known */ + unsigned long a_data; /* initialized data size */ + unsigned long a_bss; /* uninitialized data size */ #ifdef SUN_COMPAT long spd_offset; /* Correction for Sun main programs */ @@ -140,33 +143,36 @@ struct rt_symbol *rt_symbol_head; static void *__dlopen __P((char *, int)); static int __dlclose __P((void *)); static void *__dlsym __P((void *, char *)); -static int __dlctl __P((void *, int, void *)); +static char *__dlerror __P((void)); static struct ld_entry ld_entry = { - __dlopen, __dlclose, __dlsym, __dlctl + __dlopen, __dlclose, __dlsym, __dlerror }; void xprintf __P((char *, ...)); static void load_objects __P(( struct crt_ldso *, struct _dynamic *)); static struct so_map *map_object __P((struct sod *, struct so_map *)); +static int unmap_object __P((struct so_map *)); static struct so_map *alloc_link_map __P(( char *, struct sod *, struct so_map *, caddr_t, struct _dynamic *)); -static inline void check_text_reloc __P(( struct relocation_info *, +static inline int check_text_reloc __P(( struct relocation_info *, struct so_map *, caddr_t)); -static void reloc_map __P((struct so_map *)); +static int reloc_map __P((struct so_map *)); static void reloc_copy __P((struct so_map *)); static void init_map __P((struct so_map *, char *)); static char *rtfindlib __P((char *, int, int, int *)); void binder_entry __P((void)); long binder __P((jmpslot_t *)); +static void maphints __P((void)); static void unmaphints __P((void)); static struct nzlist *lookup __P((char *, struct so_map **, int)); static inline struct rt_symbol *lookup_rts __P((char *)); static struct rt_symbol *enter_rts __P((char *, long, int, caddr_t, long, struct so_map *)); +static void generror __P((char *, ...)); static inline int strcmp (register const char *s1, register const char *s2) @@ -196,28 +202,28 @@ struct _dynamic *dp; struct so_map *smp; /* Check version */ - if ( version != CRT_VERSION_BSD_2 && - version != CRT_VERSION_BSD_3 && - version != CRT_VERSION_SUN) + if (version != CRT_VERSION_BSD_2 && + version != CRT_VERSION_BSD_3 && + version != CRT_VERSION_SUN) return -1; /* Fixup __DYNAMIC structure */ (long)dp->d_un.d_sdt += crtp->crt_ba; /* Divide by hand to avoid possible use of library division routine */ - for ( nreloc = 0, n = LD_RELSZ(dp); - n > 0; - n -= sizeof(struct relocation_info) ) nreloc++; + for (nreloc = 0, n = LD_RELSZ(dp); + n > 0; + n -= sizeof(struct relocation_info) ) nreloc++; /* Relocate ourselves */ - for ( reloc = (struct relocation_info *)(LD_REL(dp) + crtp->crt_ba); - nreloc; - nreloc--, reloc++) { + for (reloc = (struct relocation_info *)(LD_REL(dp) + crtp->crt_ba); + nreloc; + nreloc--, reloc++) { - register long addr = reloc->r_address + crtp->crt_ba; + register long addr = reloc->r_address + crtp->crt_ba; - md_relocate_simple(reloc, crtp->crt_ba, addr); + md_relocate_simple(reloc, crtp->crt_ba, addr); } __progname = "ld.so"; @@ -252,7 +258,8 @@ struct _dynamic *dp; for (smp = link_map_head; smp; smp = smp->som_next) { if (LM_PRIVATE(smp)->spd_flags & RTLD_RTLD) continue; - reloc_map(smp); + if (reloc_map(smp) < 0) + return -1; } /* Copy any relocated initialized data. */ @@ -395,15 +402,27 @@ alloc_link_map(path, sodp, parent, addr, dp) { struct so_map *smp; struct somap_private *smpp; - - smpp = (struct somap_private *)xmalloc(sizeof(struct somap_private)); - smp = (struct so_map *)xmalloc(sizeof(struct so_map)); + size_t smp_size; + + /* + * Allocate so_map and private area with a single malloc. Round + * up the size of so_map so the private area is aligned. + */ + smp_size = ((((sizeof(struct so_map)) + sizeof (void *) - 1) / + sizeof (void *)) * sizeof (void *)); + + smp = (struct so_map *)xmalloc(smp_size + + sizeof (struct somap_private)); + smpp = (struct somap_private *) (((caddr_t) smp) + smp_size); smp->som_next = NULL; *link_map_tail = smp; link_map_tail = &smp->som_next; smp->som_addr = addr; - smp->som_path = path?strdup(path):NULL; + if (path == NULL) + smp->som_path = NULL; + else + smp->som_path = strdup(path); smp->som_sod = sodp; smp->som_dynamic = dp; smp->som_spd = (caddr_t)smpp; @@ -413,7 +432,9 @@ alloc_link_map(path, sodp, parent, addr, dp) smpp->spd_refcount = 0; smpp->spd_flags = 0; smpp->spd_parent = parent; - + smpp->a_text = 0; + smpp->a_data = 0; + smpp->a_bss = 0; #ifdef SUN_COMPAT smpp->spd_offset = (addr==0 && dp && dp->d_version==LD_VERSION_SUN) ? PAGSIZ : 0; @@ -437,6 +458,7 @@ map_object(sodp, smp) struct exec hdr; int usehints = 0; struct so_map *p; + struct somap_private *smpp; if (sodp->sod_library) { usehints = 1; @@ -444,12 +466,14 @@ again: path = rtfindlib(name, sodp->sod_major, sodp->sod_minor, &usehints); if (path == NULL) { - errno = ENOENT; + generror ("Can't find shared library \"%s\"", + name); return NULL; } } else { if (careful && *name != '/') { - errno = EACCES; + generror ("Shared library path must start with \"/\" for \"%s\"", + name); return NULL; } path = name; @@ -468,39 +492,38 @@ again: usehints = 0; goto again; } + generror ("open failed for \"%s\" : %s", + path, strerror (errno)); return NULL; } if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) { + generror ("header read failed for \"%s\"", + path); (void)close(fd); - /*errno = x;*/ return NULL; } if (N_BADMAG(hdr)) { + generror ("bad magic number in \"%s\"", + path); (void)close(fd); - errno = EFTYPE; return NULL; } if ((addr = mmap(0, hdr.a_text + hdr.a_data, PROT_READ|PROT_EXEC, MAP_COPY, fd, 0)) == (caddr_t)-1) { + generror ("mmap failed for \"%s\" : %s", + path, strerror (errno)); (void)close(fd); return NULL; } -#if 0 - if (mmap(addr + hdr.a_text, hdr.a_data, - PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_FIXED|MAP_COPY, - fd, hdr.a_text) == (caddr_t)-1) { - (void)close(fd); - return NULL; - } -#endif if (mprotect(addr + hdr.a_text, hdr.a_data, PROT_READ|PROT_WRITE|PROT_EXEC) != 0) { + generror ("mprotect failed for \"%s\" : %s", + path, strerror (errno)); (void)close(fd); return NULL; } @@ -509,14 +532,21 @@ again: fd = -1; #ifdef NEED_DEV_ZERO - if ((fd = open("/dev/zero", O_RDWR, 0)) == -1) - warn("open: %s", "/dev/zero"); + if ((fd = open("/dev/zero", O_RDWR, 0)) == -1) { + generror ("open failed for \"/dev/zero\" : %s", + strerror (errno)); + return NULL; + } #endif if (hdr.a_bss && mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_COPY, - fd, hdr.a_text + hdr.a_data) == (caddr_t)-1) + fd, hdr.a_text + hdr.a_data) == (caddr_t)-1) { + generror ("mmap failed for \"%s\" : %s", + path, strerror (errno)); + (void)close(fd); return NULL; + } #ifdef NEED_DEV_ZERO close(fd); @@ -528,10 +558,64 @@ again: /* Fixup __DYNAMIC structure */ (long)dp->d_un.d_sdt += (long)addr; - return alloc_link_map(path, sodp, smp, addr, dp); + p = alloc_link_map(path, sodp, smp, addr, dp); + + /* save segment sizes for unmap. */ + smpp = LM_PRIVATE(p); + smpp->a_text = hdr.a_text; + smpp->a_data = hdr.a_data; + smpp->a_bss = hdr.a_bss; + return p; +} + +/* + * Unmap an object that is nolonger in use. + */ + static int +unmap_object(smp) + struct so_map *smp; +{ + struct so_map *prev, *p; + struct somap_private *smpp; + + /* Find the object in the list and unlink it */ + + for (prev = NULL, p = link_map_head; + p != smp; + prev = p, p = p->som_next) continue; + + if (prev == NULL) { + link_map_head = smp->som_next; + if (smp->som_next == NULL) + link_map_tail = &link_map_head; + } else { + prev->som_next = smp->som_next; + if (smp->som_next == NULL) + link_map_tail = &prev->som_next; + } + + /* Unmap the sections we have mapped */ + + smpp = LM_PRIVATE(smp); + + if (munmap(smp->som_addr, smpp->a_text + smpp->a_data) < 0) { + generror ("munmap failed: %s", strerror (errno)); + return -1; + } + if (smpp->a_bss > 0) { + if (munmap(smp->som_addr + smpp->a_text + smpp->a_data, + smpp->a_bss) < 0) { + generror ("munmap failed: %s", strerror (errno)); + return -1; + } + } + free((caddr_t) smp->som_sod->sod_name); + free(smp->som_sod); + free(smp); + return 0; } -static inline void +static inline int check_text_reloc(r, smp, addr) struct relocation_info *r; struct so_map *smp; @@ -540,7 +624,7 @@ caddr_t addr; char *sym; if (addr >= LM_ETEXT(smp)) - return; + return 0; if (RELOC_EXTERN_P(r)) sym = LM_STRINGS(smp) + @@ -557,15 +641,16 @@ caddr_t addr; mprotect(smp->som_addr + LM_TXTADDR(smp), LD_TEXTSZ(smp->som_dynamic), PROT_READ|PROT_WRITE|PROT_EXEC) == -1) { - - err(1, "Cannot enable writes to %s:%s", - main_progname, smp->som_path); + generror ("mprotect failed for \"%s\" : %s", + smp->som_path, strerror (errno)); + return -1; } smp->som_write = 1; + return 0; } -static void +static int reloc_map(smp) struct so_map *smp; { @@ -586,7 +671,8 @@ reloc_map(smp) char *sym; caddr_t addr = smp->som_addr + r->r_address; - check_text_reloc(r, smp, addr); + if (check_text_reloc(r, smp, addr) < 0) + return -1; if (RELOC_EXTERN_P(r)) { struct so_map *src_map = NULL; @@ -605,10 +691,11 @@ reloc_map(smp) sym = stringbase + p->nz_strx; np = lookup(sym, &src_map, 0/*XXX-jumpslots!*/); - if (np == NULL) - errx(1, "Undefined symbol \"%s\" in %s:%s\n", + if (np == NULL) { + generror ("Undefined symbol \"%s\" in %s:%s", sym, main_progname, smp->som_path); - + return -1; + } /* * Found symbol definition. * If it's in a link map, adjust value @@ -649,12 +736,13 @@ reloc_map(smp) if (mprotect(smp->som_addr + LM_TXTADDR(smp), LD_TEXTSZ(smp->som_dynamic), PROT_READ|PROT_EXEC) == -1) { - - err(1, "Cannot disable writes to %s:%s\n", - main_progname, smp->som_path); + generror ("mprotect failed for \"%s\" : %s", + smp->som_path, strerror (errno)); + return -1; } smp->som_write = 0; } + return 0; } static void @@ -750,7 +838,7 @@ enter_rts(name, value, type, srcaddr, size, smp) /* Find end of bucket */ for (rpp = &rt_symtab[hashval]; *rpp; rpp = &(*rpp)->rt_link) - ; + continue; /* Allocate new common symbol */ rtsp = (struct rt_symbol *)malloc(sizeof(struct rt_symbol)); @@ -894,7 +982,8 @@ restart: N_UNDF + N_EXT, 0, common_size, NULL); #if DEBUG -xprintf("Allocating common: %s size %d at %#x\n", name, common_size, rtsp->rt_sp->nz_value); + xprintf("Allocating common: %s size %d at %#x\n", name, common_size, + rtsp->rt_sp->nz_value); #endif return rtsp->rt_sp; @@ -946,7 +1035,8 @@ binder(jsp) md_fix_jmpslot(jsp, (long)jsp, addr); #if DEBUG -xprintf(" BINDER: %s located at = %#x in %s\n", sym, addr, src_map->som_path); + xprintf(" BINDER: %s located at = %#x in %s\n", sym, addr, + src_map->som_path); #endif return addr; } @@ -960,7 +1050,7 @@ static char *hstrtab; #define HINTS_VALID (hheader != NULL && hheader != (struct hints_header *)-1) static void -maphints() +maphints __P((void)) { caddr_t addr; long msize; @@ -1130,10 +1220,12 @@ lose: if (cp) { if (realminor < minor && getenv("LD_SUPPRESS_WARNINGS") == NULL) warnx("warning: lib%s.so.%d.%d: " - "minor version >= %d expected, using it anyway", + "minor version < %d expected, using it anyway", name, major, realminor, minor); return cp; } + generror ("Can't find shared library \"%s\"", + name); return NULL; } @@ -1156,7 +1248,15 @@ static struct so_map dlmap = { (struct _dynamic *)0, (caddr_t)&dlmap_private }; -static int dlerrno; + +/* + * Buffer for error messages and a pointer that is set to point to the buffer + * when a error occurs. It acts as a last error flag, being set to NULL + * after an error is returned. + */ +#define DLERROR_BUF_SIZE 512 +static char dlerror_buf [DLERROR_BUF_SIZE]; +static char *dlerror_msg = NULL; static void * __dlopen(name, mode) @@ -1169,11 +1269,12 @@ __dlopen(name, mode) /* * A NULL argument returns the current set of mapped objects. */ - if (name == NULL) + if (name == NULL) { + LM_PRIVATE(link_map_head)->spd_refcount++; return link_map_head; - + } if ((sodp = (struct sod *)malloc(sizeof(struct sod))) == NULL) { - dlerrno = ENOMEM; + generror ("malloc failed: %s", strerror (errno)); return NULL; } @@ -1183,14 +1284,14 @@ __dlopen(name, mode) if ((smp = map_object(sodp, &dlmap)) == NULL) { #ifdef DEBUG -xprintf("%s: %s\n", name, strerror(errno)); + xprintf("%s: %s\n", name, dlerror_buf); #endif - dlerrno = errno; return NULL; } if (LM_PRIVATE(smp)->spd_refcount++ == 0) { LM_PRIVATE(smp)->spd_flags |= RTLD_DL; - reloc_map(smp); + if (reloc_map(smp) < 0) + return NULL; reloc_copy(smp); init_map(smp, ".init"); init_map(smp, "_init"); @@ -1206,19 +1307,17 @@ __dlclose(fd) struct so_map *smp = (struct so_map *)fd; #ifdef DEBUG -xprintf("dlclose(%s): refcount = %d\n", smp->som_path, LM_PRIVATE(smp)->spd_refcount); + xprintf("dlclose(%s): refcount = %d\n", smp->som_path, + LM_PRIVATE(smp)->spd_refcount); #endif if (--LM_PRIVATE(smp)->spd_refcount != 0) return 0; /* Dismantle shared object map and descriptor */ init_map(smp, "_fini"); -#if 0 - unmap_object(smp); - free(smp->som_sod->sod_name); - free(smp->som_sod); - free(smp); -#endif + + if (unmap_object(smp) < 0) + return -1; return 0; } @@ -1235,13 +1334,14 @@ __dlsym(fd, sym) /* * Restrict search to passed map if dlopen()ed. */ - if (LM_PRIVATE(smp)->spd_flags & RTLD_DL) + if (smp && LM_PRIVATE(smp)->spd_flags & RTLD_DL) src_map = smp; np = lookup(sym, &src_map, 1); - if (np == NULL) + if (np == NULL) { + generror ("Symbol \"%s\" not found", sym); return NULL; - + } /* Fixup jmpslot so future calls transfer directly to target */ addr = np->nz_value; if (src_map) @@ -1250,20 +1350,38 @@ __dlsym(fd, sym) return (void *)addr; } - static int -__dlctl(fd, cmd, arg) - void *fd, *arg; - int cmd; + static char * +__dlerror __P((void)) { - switch (cmd) { - case DL_GETERRNO: - *(int *)arg = dlerrno; - return 0; - default: - dlerrno = EOPNOTSUPP; - return -1; - } - return 0; + char *err; + + err = dlerror_msg; + dlerror_msg = NULL; /* Next call will return NULL */ + + return err; +} + +/* + * Generate an error message that can be later be retrieved via dlerror. + */ +static void +#if __STDC__ +generror(char *fmt, ...) +#else +generror(fmt, va_alist) +char *fmt; +#endif +{ + va_list ap; +#if __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + vsnprintf (dlerror_buf, DLERROR_BUF_SIZE, fmt, ap); + dlerror_msg = dlerror_buf; + + va_end(ap); } void diff --git a/libexec/rtld-aout/rtld.c b/libexec/rtld-aout/rtld.c index 2448f87..6332911 100644 --- a/libexec/rtld-aout/rtld.c +++ b/libexec/rtld-aout/rtld.c @@ -27,7 +27,7 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: rtld.c,v 1.19 1994/12/23 22:31:35 nate Exp $ + * $Id: rtld.c,v 1.20 1995/01/12 19:12:29 joerg Exp $ */ #include <sys/param.h> @@ -73,6 +73,9 @@ struct somap_private { #define RTLD_MAIN 1 #define RTLD_RTLD 2 #define RTLD_DL 4 + unsigned long a_text; /* text size, if known */ + unsigned long a_data; /* initialized data size */ + unsigned long a_bss; /* uninitialized data size */ #ifdef SUN_COMPAT long spd_offset; /* Correction for Sun main programs */ @@ -140,33 +143,36 @@ struct rt_symbol *rt_symbol_head; static void *__dlopen __P((char *, int)); static int __dlclose __P((void *)); static void *__dlsym __P((void *, char *)); -static int __dlctl __P((void *, int, void *)); +static char *__dlerror __P((void)); static struct ld_entry ld_entry = { - __dlopen, __dlclose, __dlsym, __dlctl + __dlopen, __dlclose, __dlsym, __dlerror }; void xprintf __P((char *, ...)); static void load_objects __P(( struct crt_ldso *, struct _dynamic *)); static struct so_map *map_object __P((struct sod *, struct so_map *)); +static int unmap_object __P((struct so_map *)); static struct so_map *alloc_link_map __P(( char *, struct sod *, struct so_map *, caddr_t, struct _dynamic *)); -static inline void check_text_reloc __P(( struct relocation_info *, +static inline int check_text_reloc __P(( struct relocation_info *, struct so_map *, caddr_t)); -static void reloc_map __P((struct so_map *)); +static int reloc_map __P((struct so_map *)); static void reloc_copy __P((struct so_map *)); static void init_map __P((struct so_map *, char *)); static char *rtfindlib __P((char *, int, int, int *)); void binder_entry __P((void)); long binder __P((jmpslot_t *)); +static void maphints __P((void)); static void unmaphints __P((void)); static struct nzlist *lookup __P((char *, struct so_map **, int)); static inline struct rt_symbol *lookup_rts __P((char *)); static struct rt_symbol *enter_rts __P((char *, long, int, caddr_t, long, struct so_map *)); +static void generror __P((char *, ...)); static inline int strcmp (register const char *s1, register const char *s2) @@ -196,28 +202,28 @@ struct _dynamic *dp; struct so_map *smp; /* Check version */ - if ( version != CRT_VERSION_BSD_2 && - version != CRT_VERSION_BSD_3 && - version != CRT_VERSION_SUN) + if (version != CRT_VERSION_BSD_2 && + version != CRT_VERSION_BSD_3 && + version != CRT_VERSION_SUN) return -1; /* Fixup __DYNAMIC structure */ (long)dp->d_un.d_sdt += crtp->crt_ba; /* Divide by hand to avoid possible use of library division routine */ - for ( nreloc = 0, n = LD_RELSZ(dp); - n > 0; - n -= sizeof(struct relocation_info) ) nreloc++; + for (nreloc = 0, n = LD_RELSZ(dp); + n > 0; + n -= sizeof(struct relocation_info) ) nreloc++; /* Relocate ourselves */ - for ( reloc = (struct relocation_info *)(LD_REL(dp) + crtp->crt_ba); - nreloc; - nreloc--, reloc++) { + for (reloc = (struct relocation_info *)(LD_REL(dp) + crtp->crt_ba); + nreloc; + nreloc--, reloc++) { - register long addr = reloc->r_address + crtp->crt_ba; + register long addr = reloc->r_address + crtp->crt_ba; - md_relocate_simple(reloc, crtp->crt_ba, addr); + md_relocate_simple(reloc, crtp->crt_ba, addr); } __progname = "ld.so"; @@ -252,7 +258,8 @@ struct _dynamic *dp; for (smp = link_map_head; smp; smp = smp->som_next) { if (LM_PRIVATE(smp)->spd_flags & RTLD_RTLD) continue; - reloc_map(smp); + if (reloc_map(smp) < 0) + return -1; } /* Copy any relocated initialized data. */ @@ -395,15 +402,27 @@ alloc_link_map(path, sodp, parent, addr, dp) { struct so_map *smp; struct somap_private *smpp; - - smpp = (struct somap_private *)xmalloc(sizeof(struct somap_private)); - smp = (struct so_map *)xmalloc(sizeof(struct so_map)); + size_t smp_size; + + /* + * Allocate so_map and private area with a single malloc. Round + * up the size of so_map so the private area is aligned. + */ + smp_size = ((((sizeof(struct so_map)) + sizeof (void *) - 1) / + sizeof (void *)) * sizeof (void *)); + + smp = (struct so_map *)xmalloc(smp_size + + sizeof (struct somap_private)); + smpp = (struct somap_private *) (((caddr_t) smp) + smp_size); smp->som_next = NULL; *link_map_tail = smp; link_map_tail = &smp->som_next; smp->som_addr = addr; - smp->som_path = path?strdup(path):NULL; + if (path == NULL) + smp->som_path = NULL; + else + smp->som_path = strdup(path); smp->som_sod = sodp; smp->som_dynamic = dp; smp->som_spd = (caddr_t)smpp; @@ -413,7 +432,9 @@ alloc_link_map(path, sodp, parent, addr, dp) smpp->spd_refcount = 0; smpp->spd_flags = 0; smpp->spd_parent = parent; - + smpp->a_text = 0; + smpp->a_data = 0; + smpp->a_bss = 0; #ifdef SUN_COMPAT smpp->spd_offset = (addr==0 && dp && dp->d_version==LD_VERSION_SUN) ? PAGSIZ : 0; @@ -437,6 +458,7 @@ map_object(sodp, smp) struct exec hdr; int usehints = 0; struct so_map *p; + struct somap_private *smpp; if (sodp->sod_library) { usehints = 1; @@ -444,12 +466,14 @@ again: path = rtfindlib(name, sodp->sod_major, sodp->sod_minor, &usehints); if (path == NULL) { - errno = ENOENT; + generror ("Can't find shared library \"%s\"", + name); return NULL; } } else { if (careful && *name != '/') { - errno = EACCES; + generror ("Shared library path must start with \"/\" for \"%s\"", + name); return NULL; } path = name; @@ -468,39 +492,38 @@ again: usehints = 0; goto again; } + generror ("open failed for \"%s\" : %s", + path, strerror (errno)); return NULL; } if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) { + generror ("header read failed for \"%s\"", + path); (void)close(fd); - /*errno = x;*/ return NULL; } if (N_BADMAG(hdr)) { + generror ("bad magic number in \"%s\"", + path); (void)close(fd); - errno = EFTYPE; return NULL; } if ((addr = mmap(0, hdr.a_text + hdr.a_data, PROT_READ|PROT_EXEC, MAP_COPY, fd, 0)) == (caddr_t)-1) { + generror ("mmap failed for \"%s\" : %s", + path, strerror (errno)); (void)close(fd); return NULL; } -#if 0 - if (mmap(addr + hdr.a_text, hdr.a_data, - PROT_READ|PROT_WRITE|PROT_EXEC, - MAP_FIXED|MAP_COPY, - fd, hdr.a_text) == (caddr_t)-1) { - (void)close(fd); - return NULL; - } -#endif if (mprotect(addr + hdr.a_text, hdr.a_data, PROT_READ|PROT_WRITE|PROT_EXEC) != 0) { + generror ("mprotect failed for \"%s\" : %s", + path, strerror (errno)); (void)close(fd); return NULL; } @@ -509,14 +532,21 @@ again: fd = -1; #ifdef NEED_DEV_ZERO - if ((fd = open("/dev/zero", O_RDWR, 0)) == -1) - warn("open: %s", "/dev/zero"); + if ((fd = open("/dev/zero", O_RDWR, 0)) == -1) { + generror ("open failed for \"/dev/zero\" : %s", + strerror (errno)); + return NULL; + } #endif if (hdr.a_bss && mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_COPY, - fd, hdr.a_text + hdr.a_data) == (caddr_t)-1) + fd, hdr.a_text + hdr.a_data) == (caddr_t)-1) { + generror ("mmap failed for \"%s\" : %s", + path, strerror (errno)); + (void)close(fd); return NULL; + } #ifdef NEED_DEV_ZERO close(fd); @@ -528,10 +558,64 @@ again: /* Fixup __DYNAMIC structure */ (long)dp->d_un.d_sdt += (long)addr; - return alloc_link_map(path, sodp, smp, addr, dp); + p = alloc_link_map(path, sodp, smp, addr, dp); + + /* save segment sizes for unmap. */ + smpp = LM_PRIVATE(p); + smpp->a_text = hdr.a_text; + smpp->a_data = hdr.a_data; + smpp->a_bss = hdr.a_bss; + return p; +} + +/* + * Unmap an object that is nolonger in use. + */ + static int +unmap_object(smp) + struct so_map *smp; +{ + struct so_map *prev, *p; + struct somap_private *smpp; + + /* Find the object in the list and unlink it */ + + for (prev = NULL, p = link_map_head; + p != smp; + prev = p, p = p->som_next) continue; + + if (prev == NULL) { + link_map_head = smp->som_next; + if (smp->som_next == NULL) + link_map_tail = &link_map_head; + } else { + prev->som_next = smp->som_next; + if (smp->som_next == NULL) + link_map_tail = &prev->som_next; + } + + /* Unmap the sections we have mapped */ + + smpp = LM_PRIVATE(smp); + + if (munmap(smp->som_addr, smpp->a_text + smpp->a_data) < 0) { + generror ("munmap failed: %s", strerror (errno)); + return -1; + } + if (smpp->a_bss > 0) { + if (munmap(smp->som_addr + smpp->a_text + smpp->a_data, + smpp->a_bss) < 0) { + generror ("munmap failed: %s", strerror (errno)); + return -1; + } + } + free((caddr_t) smp->som_sod->sod_name); + free(smp->som_sod); + free(smp); + return 0; } -static inline void +static inline int check_text_reloc(r, smp, addr) struct relocation_info *r; struct so_map *smp; @@ -540,7 +624,7 @@ caddr_t addr; char *sym; if (addr >= LM_ETEXT(smp)) - return; + return 0; if (RELOC_EXTERN_P(r)) sym = LM_STRINGS(smp) + @@ -557,15 +641,16 @@ caddr_t addr; mprotect(smp->som_addr + LM_TXTADDR(smp), LD_TEXTSZ(smp->som_dynamic), PROT_READ|PROT_WRITE|PROT_EXEC) == -1) { - - err(1, "Cannot enable writes to %s:%s", - main_progname, smp->som_path); + generror ("mprotect failed for \"%s\" : %s", + smp->som_path, strerror (errno)); + return -1; } smp->som_write = 1; + return 0; } -static void +static int reloc_map(smp) struct so_map *smp; { @@ -586,7 +671,8 @@ reloc_map(smp) char *sym; caddr_t addr = smp->som_addr + r->r_address; - check_text_reloc(r, smp, addr); + if (check_text_reloc(r, smp, addr) < 0) + return -1; if (RELOC_EXTERN_P(r)) { struct so_map *src_map = NULL; @@ -605,10 +691,11 @@ reloc_map(smp) sym = stringbase + p->nz_strx; np = lookup(sym, &src_map, 0/*XXX-jumpslots!*/); - if (np == NULL) - errx(1, "Undefined symbol \"%s\" in %s:%s\n", + if (np == NULL) { + generror ("Undefined symbol \"%s\" in %s:%s", sym, main_progname, smp->som_path); - + return -1; + } /* * Found symbol definition. * If it's in a link map, adjust value @@ -649,12 +736,13 @@ reloc_map(smp) if (mprotect(smp->som_addr + LM_TXTADDR(smp), LD_TEXTSZ(smp->som_dynamic), PROT_READ|PROT_EXEC) == -1) { - - err(1, "Cannot disable writes to %s:%s\n", - main_progname, smp->som_path); + generror ("mprotect failed for \"%s\" : %s", + smp->som_path, strerror (errno)); + return -1; } smp->som_write = 0; } + return 0; } static void @@ -750,7 +838,7 @@ enter_rts(name, value, type, srcaddr, size, smp) /* Find end of bucket */ for (rpp = &rt_symtab[hashval]; *rpp; rpp = &(*rpp)->rt_link) - ; + continue; /* Allocate new common symbol */ rtsp = (struct rt_symbol *)malloc(sizeof(struct rt_symbol)); @@ -894,7 +982,8 @@ restart: N_UNDF + N_EXT, 0, common_size, NULL); #if DEBUG -xprintf("Allocating common: %s size %d at %#x\n", name, common_size, rtsp->rt_sp->nz_value); + xprintf("Allocating common: %s size %d at %#x\n", name, common_size, + rtsp->rt_sp->nz_value); #endif return rtsp->rt_sp; @@ -946,7 +1035,8 @@ binder(jsp) md_fix_jmpslot(jsp, (long)jsp, addr); #if DEBUG -xprintf(" BINDER: %s located at = %#x in %s\n", sym, addr, src_map->som_path); + xprintf(" BINDER: %s located at = %#x in %s\n", sym, addr, + src_map->som_path); #endif return addr; } @@ -960,7 +1050,7 @@ static char *hstrtab; #define HINTS_VALID (hheader != NULL && hheader != (struct hints_header *)-1) static void -maphints() +maphints __P((void)) { caddr_t addr; long msize; @@ -1130,10 +1220,12 @@ lose: if (cp) { if (realminor < minor && getenv("LD_SUPPRESS_WARNINGS") == NULL) warnx("warning: lib%s.so.%d.%d: " - "minor version >= %d expected, using it anyway", + "minor version < %d expected, using it anyway", name, major, realminor, minor); return cp; } + generror ("Can't find shared library \"%s\"", + name); return NULL; } @@ -1156,7 +1248,15 @@ static struct so_map dlmap = { (struct _dynamic *)0, (caddr_t)&dlmap_private }; -static int dlerrno; + +/* + * Buffer for error messages and a pointer that is set to point to the buffer + * when a error occurs. It acts as a last error flag, being set to NULL + * after an error is returned. + */ +#define DLERROR_BUF_SIZE 512 +static char dlerror_buf [DLERROR_BUF_SIZE]; +static char *dlerror_msg = NULL; static void * __dlopen(name, mode) @@ -1169,11 +1269,12 @@ __dlopen(name, mode) /* * A NULL argument returns the current set of mapped objects. */ - if (name == NULL) + if (name == NULL) { + LM_PRIVATE(link_map_head)->spd_refcount++; return link_map_head; - + } if ((sodp = (struct sod *)malloc(sizeof(struct sod))) == NULL) { - dlerrno = ENOMEM; + generror ("malloc failed: %s", strerror (errno)); return NULL; } @@ -1183,14 +1284,14 @@ __dlopen(name, mode) if ((smp = map_object(sodp, &dlmap)) == NULL) { #ifdef DEBUG -xprintf("%s: %s\n", name, strerror(errno)); + xprintf("%s: %s\n", name, dlerror_buf); #endif - dlerrno = errno; return NULL; } if (LM_PRIVATE(smp)->spd_refcount++ == 0) { LM_PRIVATE(smp)->spd_flags |= RTLD_DL; - reloc_map(smp); + if (reloc_map(smp) < 0) + return NULL; reloc_copy(smp); init_map(smp, ".init"); init_map(smp, "_init"); @@ -1206,19 +1307,17 @@ __dlclose(fd) struct so_map *smp = (struct so_map *)fd; #ifdef DEBUG -xprintf("dlclose(%s): refcount = %d\n", smp->som_path, LM_PRIVATE(smp)->spd_refcount); + xprintf("dlclose(%s): refcount = %d\n", smp->som_path, + LM_PRIVATE(smp)->spd_refcount); #endif if (--LM_PRIVATE(smp)->spd_refcount != 0) return 0; /* Dismantle shared object map and descriptor */ init_map(smp, "_fini"); -#if 0 - unmap_object(smp); - free(smp->som_sod->sod_name); - free(smp->som_sod); - free(smp); -#endif + + if (unmap_object(smp) < 0) + return -1; return 0; } @@ -1235,13 +1334,14 @@ __dlsym(fd, sym) /* * Restrict search to passed map if dlopen()ed. */ - if (LM_PRIVATE(smp)->spd_flags & RTLD_DL) + if (smp && LM_PRIVATE(smp)->spd_flags & RTLD_DL) src_map = smp; np = lookup(sym, &src_map, 1); - if (np == NULL) + if (np == NULL) { + generror ("Symbol \"%s\" not found", sym); return NULL; - + } /* Fixup jmpslot so future calls transfer directly to target */ addr = np->nz_value; if (src_map) @@ -1250,20 +1350,38 @@ __dlsym(fd, sym) return (void *)addr; } - static int -__dlctl(fd, cmd, arg) - void *fd, *arg; - int cmd; + static char * +__dlerror __P((void)) { - switch (cmd) { - case DL_GETERRNO: - *(int *)arg = dlerrno; - return 0; - default: - dlerrno = EOPNOTSUPP; - return -1; - } - return 0; + char *err; + + err = dlerror_msg; + dlerror_msg = NULL; /* Next call will return NULL */ + + return err; +} + +/* + * Generate an error message that can be later be retrieved via dlerror. + */ +static void +#if __STDC__ +generror(char *fmt, ...) +#else +generror(fmt, va_alist) +char *fmt; +#endif +{ + va_list ap; +#if __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + vsnprintf (dlerror_buf, DLERROR_BUF_SIZE, fmt, ap); + dlerror_msg = dlerror_buf; + + va_end(ap); } void |