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rtld: Return error if $ORIGIN for a dlopen-ed library cannot be resolved ...

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instead of killing the process.  The same behaviour of terminating
image activation if the $ORIGIN cannot be resolved for the main
object, is kept.

Reported by:	Greg V <greg@unrelenting.technology>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D23053
This commit is contained in:
kib 2020-01-09 10:05:45 +00:00
parent 795b375dc0
commit 8589f5ee20
1 changed files with 25 additions and 14 deletions
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39
libexec/rtld-elf/rtld.c
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@ -88,9 +88,9 @@ extern void (*__cleanup)(void);
static const char *basename(const char *);
static void digest_dynamic1(Obj_Entry *, int, const Elf_Dyn **,
const Elf_Dyn **, const Elf_Dyn **);
static void digest_dynamic2(Obj_Entry *, const Elf_Dyn *, const Elf_Dyn *,
static bool digest_dynamic2(Obj_Entry *, const Elf_Dyn *, const Elf_Dyn *,
const Elf_Dyn *);
static void digest_dynamic(Obj_Entry *, int);
static bool digest_dynamic(Obj_Entry *, int);
static Obj_Entry *digest_phdr(const Elf_Phdr *, int, caddr_t, const char *);
static void distribute_static_tls(Objlist *, RtldLockState *);
static Obj_Entry *dlcheck(void *);
@ -671,7 +671,8 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
}
#endif
digest_dynamic(obj_main, 0);
if (!digest_dynamic(obj_main, 0))
rtld_die();
dbg("%s valid_hash_sysv %d valid_hash_gnu %d dynsymcount %d",
obj_main->path, obj_main->valid_hash_sysv, obj_main->valid_hash_gnu,
obj_main->dynsymcount);
@ -1408,13 +1409,13 @@ obj_resolve_origin(Obj_Entry *obj)
return (rtld_dirname_abs(obj->path, obj->origin_path) != -1);
}
static void
static bool
digest_dynamic2(Obj_Entry *obj, const Elf_Dyn *dyn_rpath,
const Elf_Dyn *dyn_soname, const Elf_Dyn *dyn_runpath)
{
if (obj->z_origin && !obj_resolve_origin(obj))
rtld_die();
return (false);
if (dyn_runpath != NULL) {
obj->runpath = (const char *)obj->strtab + dyn_runpath->d_un.d_val;
@ -1425,9 +1426,10 @@ digest_dynamic2(Obj_Entry *obj, const Elf_Dyn *dyn_rpath,
}
if (dyn_soname != NULL)
object_add_name(obj, obj->strtab + dyn_soname->d_un.d_val);
return (true);
}
static void
static bool
digest_dynamic(Obj_Entry *obj, int early)
{
const Elf_Dyn *dyn_rpath;
@ -1435,7 +1437,7 @@ digest_dynamic(Obj_Entry *obj, int early)
const Elf_Dyn *dyn_runpath;
digest_dynamic1(obj, early, &dyn_rpath, &dyn_soname, &dyn_runpath);
digest_dynamic2(obj, dyn_rpath, dyn_soname, dyn_runpath);
return (digest_dynamic2(obj, dyn_rpath, dyn_soname, dyn_runpath));
}
/*
@ -2563,16 +2565,15 @@ do_load_object(int fd, const char *name, char *path, struct stat *sbp,
if (name != NULL)
object_add_name(obj, name);
obj->path = path;
digest_dynamic(obj, 0);
if (!digest_dynamic(obj, 0))
goto errp;
dbg("%s valid_hash_sysv %d valid_hash_gnu %d dynsymcount %d", obj->path,
obj->valid_hash_sysv, obj->valid_hash_gnu, obj->dynsymcount);
if (obj->z_noopen && (flags & (RTLD_LO_DLOPEN | RTLD_LO_TRACE)) ==
RTLD_LO_DLOPEN) {
dbg("refusing to load non-loadable \"%s\"", obj->path);
_rtld_error("Cannot dlopen non-loadable %s", obj->path);
munmap(obj->mapbase, obj->mapsize);
obj_free(obj);
return (NULL);
goto errp;
}
obj->dlopened = (flags & RTLD_LO_DLOPEN) != 0;
@ -2589,7 +2590,12 @@ do_load_object(int fd, const char *name, char *path, struct stat *sbp,
LD_UTRACE(UTRACE_LOAD_OBJECT, obj, obj->mapbase, obj->mapsize, 0,
obj->path);
return obj;
return (obj);
errp:
munmap(obj->mapbase, obj->mapsize);
obj_free(obj);
return (NULL);
}
static Obj_Entry *
@ -3990,12 +3996,17 @@ rtld_dirname_abs(const char *path, char *base)
{
char *last;
if (realpath(path, base) == NULL)
if (realpath(path, base) == NULL) {
_rtld_error("realpath \"%s\" failed (%s)", path,
rtld_strerror(errno));
return (-1);
}
dbg("%s -> %s", path, base);
last = strrchr(base, '/');
if (last == NULL)
if (last == NULL) {
_rtld_error("non-abs result from realpath \"%s\"", path);
return (-1);
}
if (last != base)
*last = '\0';
return (0);