/*
* Process the given archive and extract objects for inclusion into
* the link.
*
* entry:
* name - Name of archive
* fd - Open file descriptor for archive
* adp - Archive descriptor
* ofl - output descriptor
*
* exit:
* Returns FALSE on fatal error, TRUE otherwise.
*/
Boolean
ld_process_archive(const char *name, int fd, Ar_desc *adp, Ofl_desc *ofl)
{
Boolean found = FALSE;
Rej_desc rej = { 0 };
/*
* If a fatal error condition has been set there's really no point in
* processing the archive further. Having got to this point we have at
* least established that the archive exists (thus verifying that the
* command line options that got us to this archive are correct). Very
* large archives can take a significant time to process, therefore
* continuing on from here may significantly delay the fatal error
* message the user is already set to receive.
*/
if (ofl->ofl_flags & FLG_OF_FATAL)
return (TRUE);
/*
* If this archive was processed with -z allextract, then all members
* have already been extracted.
*/
if (adp->ad_elf == NULL)
return (TRUE);
if (ofl->ofl_flags1 & FLG_OF1_ALLEXRT) {
if (!ar_extract_all(name, fd, adp, ofl, &found, &rej))
return (FALSE);
} else {
if (!ar_extract_bysym(name, fd, adp, ofl, &found, &rej))
return (FALSE);
}
/*
* If no objects have been found in the archive test for any rejections
* and if one had occurred issue a warning - its possible a user has
* pointed at an archive containing the wrong class of elf members.
*/
if ((found == 0) && rej.rej_type) {
Conv_reject_desc_buf_t rej_buf;
ld_eprintf(ofl, ERR_WARNING, MSG_INTL(reject[rej.rej_type]),
rej.rej_name ? rej.rej_name : MSG_INTL(MSG_STR_UNKNOWN),
conv_reject_desc(&rej, &rej_buf, ld_targ.t_m.m_mach));
}
return (TRUE);
}
Rt_map *
setup(char **envp, auxv_t *auxv, Word _flags, char *_platform, int _syspagsz,
char *_rtldname, ulong_t ld_base, ulong_t interp_base, int fd, Phdr *phdr,
char *execname, char **argv, uid_t uid, uid_t euid, gid_t gid, gid_t egid,
void *aoutdyn, int auxflags, uint_t *hwcap)
{
Rt_map *rlmp, *mlmp, *clmp, **tobj = NULL;
Ehdr *ehdr;
rtld_stat_t status;
int features = 0, ldsoexec = 0;
size_t eaddr, esize;
char *str, *argvname;
Word lmflags;
mmapobj_result_t *mpp;
Fdesc fdr = { 0 }, fdm = { 0 };
Rej_desc rej = { 0 };
APlist *ealp = NULL;
/*
* Now that ld.so has relocated itself, initialize our own 'environ' so
* as to establish an address suitable for any libc requirements.
*/
_environ = (char **)((ulong_t)auxv - sizeof (char *));
_init();
_environ = envp;
/*
* Establish a base time. Total time diagnostics start from entering
* ld.so.1 here, however the base time is reset each time the ld.so.1
* is re-entered. Note also, there will be a large time associated
* with the first diagnostic from ld.so.1, as bootstrapping ld.so.1
* and establishing the liblddbg infrastructure takes some time.
*/
(void) gettimeofday(&DBG_TOTALTIME, NULL);
DBG_DELTATIME = DBG_TOTALTIME;
/*
* Determine how ld.so.1 has been executed.
*/
if ((fd == -1) && (phdr == NULL)) {
/*
* If we received neither the AT_EXECFD nor the AT_PHDR aux
* vector, ld.so.1 must have been invoked directly from the
* command line.
*/
ldsoexec = 1;
/*
* AT_SUN_EXECNAME provides the most precise name, if it is
* available, otherwise fall back to argv[0]. At this time,
* there is no process name.
*/
if (execname)
rtldname = execname;
else if (argv[0])
rtldname = argv[0];
else
rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN);
} else {
/*
* Otherwise, we have a standard process. AT_SUN_EXECNAME
* provides the most precise name, if it is available,
* otherwise fall back to argv[0]. Provided the application
* is already mapped, the process is the application, so
* simplify the application name for use in any diagnostics.
*/
if (execname)
argvname = execname;
else if (argv[0])
argvname = execname = argv[0];
else
argvname = execname = (char *)MSG_INTL(MSG_STR_UNKNOWN);
if (fd == -1) {
if ((str = strrchr(argvname, '/')) != NULL)
procname = ++str;
else
procname = argvname;
}
/*
* At this point, we don't know the runtime linkers full path
* name. The _rtldname passed to us is the SONAME of the
* runtime linker, which is typically /lib/ld.so.1 no matter
* what the full path is. Use this for now, we'll reset the
* runtime linkers name once the application is analyzed.
*/
if (_rtldname) {
if ((str = strrchr(_rtldname, '/')) != NULL)
rtldname = ++str;
else
rtldname = _rtldname;
} else
rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN);
/* exec() brought in two objects for us. Count the second one */
cnt_map++;
}
/*
* Initialize any global variables.
*/
at_flags = _flags;
if ((org_scapset->sc_plat = _platform) != NULL)
org_scapset->sc_platsz = strlen(_platform);
if (org_scapset->sc_plat == NULL)
platform_name(org_scapset);
if (org_scapset->sc_mach == NULL)
machine_name(org_scapset);
/*
* If pagesize is unspecified find its value.
*/
if ((syspagsz = _syspagsz) == 0)
syspagsz = _sysconfig(_CONFIG_PAGESIZE);
/*
* Add the unused portion of the last data page to the free space list.
* The page size must be set before doing this. Here, _end refers to
* the end of the runtime linkers bss. Note that we do not use the
* unused data pages from any included .so's to supplement this free
* space as badly behaved .os's may corrupt this data space, and in so
* doing ruin our data.
*/
eaddr = S_DROUND((size_t)&_end);
esize = eaddr % syspagsz;
if (esize) {
esize = syspagsz - esize;
addfree((void *)eaddr, esize);
}
/*
* Establish initial link-map list flags, and link-map list alists.
*/
if (alist_append(&lml_main.lm_lists, NULL, sizeof (Lm_cntl),
AL_CNT_LMLISTS) == NULL)
return (0);
lml_main.lm_flags |= LML_FLG_BASELM;
lml_main.lm_lmid = LM_ID_BASE;
lml_main.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_BASE);
if (alist_append(&lml_rtld.lm_lists, NULL, sizeof (Lm_cntl),
AL_CNT_LMLISTS) == NULL)
return (0);
lml_rtld.lm_flags |= (LML_FLG_RTLDLM | LML_FLG_HOLDLOCK);
lml_rtld.lm_tflags |= LML_TFLG_NOAUDIT;
lml_rtld.lm_lmid = LM_ID_LDSO;
lml_rtld.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_LDSO);
/*
* Determine whether we have a secure executable.
*/
security(uid, euid, gid, egid, auxflags);
/*
* Make an initial pass of environment variables to pick off those
* related to locale processing. At the same time, collect and save
* any LD_XXXX variables for later processing. Note that this later
* processing will be skipped if ld.so.1 is invoked from the command
* line with -e LD_NOENVIRON.
*/
if (envp && (readenv_user((const char **)envp, &ealp) == 1))
return (0);
/*
* If ld.so.1 has been invoked directly, process its arguments.
*/
if (ldsoexec) {
/*
* Process any arguments that are specific to ld.so.1, and
* reorganize the process stack to effectively remove ld.so.1
* from the stack. Reinitialize the environment pointer, as
* this pointer may have been shifted after skipping ld.so.1's
* arguments.
*/
if (rtld_getopt(argv, &envp, &auxv, &(lml_main.lm_flags),
&(lml_main.lm_tflags), (aoutdyn != 0)) == 1) {
eprintf(&lml_main, ERR_NONE, MSG_INTL(MSG_USG_BADOPT));
return (0);
}
_environ = envp;
/*
* Open the object that ld.so.1 is to execute.
*/
argvname = execname = argv[0];
if ((fd = open(argvname, O_RDONLY)) == -1) {
int err = errno;
eprintf(&lml_main, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN),
argvname, strerror(err));
return (0);
}
}
/*
* Having processed any ld.so.1 command line options, return to process
* any LD_XXXX environment variables.
*/
if (ealp) {
if (((rtld_flags & RT_FL_NOENVIRON) == 0) &&
(procenv_user(ealp, &(lml_main.lm_flags),
&(lml_main.lm_tflags), (aoutdyn != 0)) == 1))
return (0);
free(ealp);
}
/*
* Initialize a hardware capability descriptor for use in comparing
* each loaded object. The aux vector must provide AF_SUN_HWCAPVERIFY,
* as prior to this setting any hardware capabilities that were found
* could not be relied upon.
*/
if (auxflags & AF_SUN_HWCAPVERIFY) {
rtld_flags2 |= RT_FL2_HWCAP;
org_scapset->sc_hw_1 = (Xword)hwcap[0];
org_scapset->sc_hw_2 = (Xword)hwcap[1];
}
/*
* Create a mapping descriptor for ld.so.1. We can determine our
* two segments information from known symbols.
*/
if ((mpp = calloc(2, sizeof (mmapobj_result_t))) == NULL)
return (0);
mpp[0].mr_addr = (caddr_t)M_PTRUNC(ld_base);
mpp[0].mr_msize = (caddr_t)&_etext - mpp[0].mr_addr;
mpp[0].mr_fsize = mpp[0].mr_msize;
mpp[0].mr_prot = (PROT_READ | PROT_EXEC);
mpp[1].mr_addr = (caddr_t)M_PTRUNC((uintptr_t)&r_debug);
mpp[1].mr_msize = (caddr_t)&_end - mpp[1].mr_addr;
mpp[1].mr_fsize = (caddr_t)&_edata - mpp[1].mr_addr;
mpp[1].mr_prot = (PROT_READ | PROT_WRITE | PROT_EXEC);
if ((fdr.fd_nname = stravl_insert(_rtldname, 0, 0, 0)) == NULL)
return (0);
if ((rlmp = elf_new_lmp(&lml_rtld, ALIST_OFF_DATA, &fdr,
(Addr)mpp->mr_addr, (size_t)((uintptr_t)eaddr - (uintptr_t)ld_base),
NULL, NULL, NULL)) == NULL)
return (0);
MMAPS(rlmp) = mpp;
MMAPCNT(rlmp) = 2;
PADSTART(rlmp) = (ulong_t)mpp[0].mr_addr;
PADIMLEN(rlmp) = (ulong_t)mpp[0].mr_addr + (ulong_t)mpp[1].mr_addr +
(ulong_t)mpp[1].mr_msize;
MODE(rlmp) |= (RTLD_LAZY | RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD);
FLAGS(rlmp) |= (FLG_RT_ANALYZED | FLG_RT_RELOCED | FLG_RT_INITDONE |
FLG_RT_INITCLCT | FLG_RT_FINICLCT | FLG_RT_MODESET);
/*
* Initialize the runtime linkers information.
*/
interp = &_interp;
interp->i_name = (char *)rtldname;
interp->i_faddr = (caddr_t)ADDR(rlmp);
ldso_plt_init(rlmp);
/*
* Map in the file, if exec has not already done so, or if the file
* was passed as an argument to an explicit execution of ld.so.1 from
* the command line.
*/
if (fd != -1) {
/*
* Map the file. Once the object is mapped we no longer need
* the file descriptor.
*/
(void) rtld_fstat(fd, &status);
fdm.fd_oname = argvname;
fdm.fd_ftp = map_obj(&lml_main, &fdm, status.st_size, argvname,
fd, &rej);
(void) close(fd);
if (fdm.fd_ftp == NULL) {
Conv_reject_desc_buf_t rej_buf;
eprintf(&lml_main, ERR_FATAL,
MSG_INTL(err_reject[rej.rej_type]), argvname,
conv_reject_desc(&rej, &rej_buf, M_MACH));
return (0);
}
/*
* Finish processing the loading of the file.
*/
if ((fdm.fd_nname = stravl_insert(argvname, 0, 0, 0)) == NULL)
return (0);
fdm.fd_dev = status.st_dev;
fdm.fd_ino = status.st_ino;
if ((mlmp = load_file(&lml_main, ALIST_OFF_DATA, NULL, &fdm,
NULL)) == NULL)
return (0);
/*
* We now have a process name for error diagnostics.
*/
if ((str = strrchr(argvname, '/')) != NULL)
procname = ++str;
else
procname = argvname;
if (ldsoexec) {
mmapobj_result_t *mpp = MMAPS(mlmp);
uint_t mnum, mapnum = MMAPCNT(mlmp);
void *brkbase = NULL;
/*
* Since ld.so.1 was the primary executed object - the
* brk() base has not yet been initialized, we need to
* initialize it. For an executable, initialize it to
* the end of the object. For a shared object (ET_DYN)
* initialize it to the first page in memory.
*/
for (mnum = 0; mnum < mapnum; mnum++, mpp++)
brkbase = mpp->mr_addr + mpp->mr_msize;
if (brkbase == NULL)
brkbase = (void *)syspagsz;
if (_brk_unlocked(brkbase) == -1) {
int err = errno;
eprintf(&lml_main, ERR_FATAL,
MSG_INTL(MSG_SYS_BRK), argvname,
strerror(err));
return (0);
}
}
} else {
/*
* Set up function ptr and arguments according to the type
* of file class the executable is. (Currently only supported
* types are ELF and a.out format.) Then create a link map
* for the executable.
*/
if (aoutdyn) {
#ifdef A_OUT
mmapobj_result_t *mpp;
/*
* Create a mapping structure sufficient to describe
* a single two segments. The ADDR() of the a.out is
* established as 0, which is required but the AOUT
* relocation code.
*/
if ((mpp =
calloc(sizeof (mmapobj_result_t), 2)) == NULL)
return (0);
if ((fdm.fd_nname =
stravl_insert(execname, 0, 0, 0)) == NULL)
return (0);
if ((mlmp = aout_new_lmp(&lml_main, ALIST_OFF_DATA,
&fdm, 0, 0, aoutdyn, NULL, NULL)) == NULL)
return (0);
/*
* Establish the true mapping information for the a.out.
*/
if (aout_get_mmap(&lml_main, mpp)) {
free(mpp);
return (0);
}
MSIZE(mlmp) =
(size_t)(mpp[1].mr_addr + mpp[1].mr_msize) -
S_ALIGN((size_t)mpp[0].mr_addr, syspagsz);
MMAPS(mlmp) = mpp;
MMAPCNT(mlmp) = 2;
PADSTART(mlmp) = (ulong_t)mpp->mr_addr;
PADIMLEN(mlmp) = mpp->mr_msize;
/*
* Disable any object configuration cache (BCP apps
* bring in sbcp which can benefit from any object
* cache, but both the app and sbcp can't use the same
* objects).
*/
rtld_flags |= RT_FL_NOOBJALT;
/*
* Make sure no-direct bindings are in effect.
*/
lml_main.lm_tflags |= LML_TFLG_NODIRECT;
#else
eprintf(&lml_main, ERR_FATAL,
MSG_INTL(MSG_ERR_REJ_UNKFILE), argvname);
return (0);
#endif
} else if (phdr) {
Phdr *pptr;
Off i_offset = 0;
Addr base = 0;
ulong_t phsize;
mmapobj_result_t *mpp, *fmpp, *hmpp = NULL;
uint_t mapnum = 0;
int i;
size_t msize;
/*
* Using the executables phdr address determine the base
* address of the input file. NOTE, this assumes the
* program headers and elf header are part of the same
* mapped segment. Although this has held for many
* years now, it might be more flexible if the kernel
* gave use the ELF headers start address, rather than
* the Program headers.
*
* Determine from the ELF header if we're been called
* from a shared object or dynamic executable. If the
* latter, then any addresses within the object are used
* as is. Addresses within shared objects must be added
* to the process's base address.
*/
ehdr = (Ehdr *)((Addr)phdr - phdr->p_offset);
phsize = ehdr->e_phentsize;
if (ehdr->e_type == ET_DYN)
base = (Addr)ehdr;
/*
* Allocate a mapping array to retain mapped segment
* information.
*/
if ((fmpp = mpp = calloc(ehdr->e_phnum,
sizeof (mmapobj_result_t))) == NULL)
return (0);
/*
* Extract the needed information from the segment
* headers.
*/
for (i = 0, pptr = phdr; i < ehdr->e_phnum; i++) {
if (pptr->p_type == PT_INTERP) {
i_offset = pptr->p_offset;
interp->i_faddr =
(caddr_t)interp_base;
}
if ((pptr->p_type == PT_LOAD) &&
(pptr->p_filesz || pptr->p_memsz)) {
int perm = (PROT_READ | PROT_EXEC);
size_t off;
if (i_offset && pptr->p_filesz &&
(i_offset >= pptr->p_offset) &&
(i_offset <=
(pptr->p_memsz + pptr->p_offset))) {
interp->i_name = (char *)
pptr->p_vaddr + i_offset -
pptr->p_offset + base;
i_offset = 0;
}
if (pptr->p_flags & PF_W)
perm |= PROT_WRITE;
/*
* Retain segments mapping info. Round
* each segment to a page boundary, as
* this insures addresses are suitable
* for mprotect() if required.
*/
off = pptr->p_vaddr + base;
if (hmpp == NULL) {
hmpp = mpp;
mpp->mr_addr = (caddr_t)ehdr;
} else
mpp->mr_addr = (caddr_t)off;
off -= (size_t)(uintptr_t)mpp->mr_addr;
mpp->mr_msize = pptr->p_memsz + off;
mpp->mr_fsize = pptr->p_filesz + off;
mpp->mr_prot = perm;
mpp++, mapnum++;
}
pptr = (Phdr *)((ulong_t)pptr + phsize);
}
mpp--;
msize = (size_t)(mpp->mr_addr + mpp->mr_msize) -
S_ALIGN((size_t)fmpp->mr_addr, syspagsz);
if ((fdm.fd_nname =
stravl_insert(execname, 0, 0, 0)) == NULL)
return (0);
if ((mlmp = elf_new_lmp(&lml_main, ALIST_OFF_DATA,
&fdm, (Addr)hmpp->mr_addr, msize,
NULL, NULL, NULL)) == NULL)
return (0);
MMAPS(mlmp) = fmpp;
MMAPCNT(mlmp) = mapnum;
PADSTART(mlmp) = (ulong_t)fmpp->mr_addr;
PADIMLEN(mlmp) = (ulong_t)fmpp->mr_addr +
(ulong_t)mpp->mr_addr + (ulong_t)mpp->mr_msize;
}
}
/*
* Establish the interpretors name as that defined within the initial
* object (executable). This provides for ORIGIN processing of ld.so.1
* dependencies. Note, the NAME() of the object remains that which was
* passed to us as the SONAME on execution.
*/
if (ldsoexec == 0) {
size_t len = strlen(interp->i_name);
if (expand(&interp->i_name, &len, 0, 0,
(PD_TKN_ISALIST | PD_TKN_CAP), rlmp) & PD_TKN_RESOLVED)
fdr.fd_flags |= FLG_FD_RESOLVED;
}
fdr.fd_pname = interp->i_name;
(void) fullpath(rlmp, &fdr);
/*
* The runtime linker acts as a filtee for various dl*() functions that
* are defined in libc (and libdl). Make sure this standard name for
* the runtime linker is also registered in the FullPathNode AVL tree.
*/
(void) fpavl_insert(&lml_rtld, rlmp, _rtldname, 0);
/*
* Having established the true runtime linkers name, simplify the name
* for error diagnostics.
*/
if ((str = strrchr(PATHNAME(rlmp), '/')) != NULL)
rtldname = ++str;
else
rtldname = PATHNAME(rlmp);
/*
* Expand the fullpath name of the application. This typically occurs
* as a part of loading an object, but as the kernel probably mapped
* it in, complete this processing now.
*/
(void) fullpath(mlmp, 0);
/*
* Some troublesome programs will change the value of argv[0]. Dupping
* the process string protects us, and insures the string is left in
* any core files.
*/
if ((str = (char *)strdup(procname)) == NULL)
return (0);
procname = str;
FLAGS(mlmp) |= (FLG_RT_ISMAIN | FLG_RT_MODESET);
FLAGS1(mlmp) |= FL1_RT_USED;
/*
* It's the responsibility of MAIN(crt0) to call it's _init and _fini
* section, therefore null out any INIT/FINI so that this object isn't
* collected during tsort processing. And, if the application has no
* initarray or finiarray we can economize on establishing bindings.
*/
INIT(mlmp) = FINI(mlmp) = NULL;
if ((INITARRAY(mlmp) == NULL) && (FINIARRAY(mlmp) == NULL))
FLAGS1(mlmp) |= FL1_RT_NOINIFIN;
/*
* Identify lddstub if necessary.
*/
if (lml_main.lm_flags & LML_FLG_TRC_LDDSTUB)
FLAGS1(mlmp) |= FL1_RT_LDDSTUB;
/*
* Retain our argument information for use in dlinfo.
*/
argsinfo.dla_argv = argv--;
argsinfo.dla_argc = (long)*argv;
argsinfo.dla_envp = envp;
argsinfo.dla_auxv = auxv;
(void) enter(0);
/*
* Add our two main link-maps to the dynlm_list
*/
if (aplist_append(&dynlm_list, &lml_main, AL_CNT_DYNLIST) == NULL)
return (0);
if (aplist_append(&dynlm_list, &lml_rtld, AL_CNT_DYNLIST) == NULL)
return (0);
/*
* Reset the link-map counts for both lists. The init count is used to
* track how many objects have pending init sections, this gets incre-
* mented each time an object is relocated. Since ld.so.1 relocates
* itself, it's init count will remain zero.
* The object count is used to track how many objects have pending fini
* sections, as ld.so.1 handles its own fini we can zero its count.
*/
lml_main.lm_obj = 1;
lml_rtld.lm_obj = 0;
/*
* Initialize debugger information structure. Some parts of this
* structure were initialized statically.
*/
r_debug.rtd_rdebug.r_map = (Link_map *)lml_main.lm_head;
r_debug.rtd_rdebug.r_ldsomap = (Link_map *)lml_rtld.lm_head;
r_debug.rtd_rdebug.r_ldbase = r_debug.rtd_rdebug.r_ldsomap->l_addr;
r_debug.rtd_dynlmlst = &dynlm_list;
/*
* Determine the dev/inode information for the executable to complete
* load_so() checking for those who might dlopen(a.out).
*/
if (rtld_stat(PATHNAME(mlmp), &status) == 0) {
STDEV(mlmp) = status.st_dev;
STINO(mlmp) = status.st_ino;
}
/*
* Initialize any configuration information.
*/
if (!(rtld_flags & RT_FL_NOCFG)) {
if ((features = elf_config(mlmp, (aoutdyn != 0))) == -1)
return (0);
}
#if defined(_ELF64)
/*
* If this is a 64-bit process, determine whether this process has
* restricted the process address space to 32-bits. Any dependencies
* that are restricted to a 32-bit address space can only be loaded if
* the executable has established this requirement.
*/
if (CAPSET(mlmp).sc_sf_1 & SF1_SUNW_ADDR32)
rtld_flags2 |= RT_FL2_ADDR32;
#endif
/*
* Establish any alternative capabilities, and validate this object
* if it defines it's own capabilities information.
*/
if (cap_alternative() == 0)
return (0);
if (cap_check_lmp(mlmp, &rej) == 0) {
if (lml_main.lm_flags & LML_FLG_TRC_ENABLE) {
/* LINTED */
(void) printf(MSG_INTL(ldd_warn[rej.rej_type]),
NAME(mlmp), rej.rej_str);
} else {
/* LINTED */
eprintf(&lml_main, ERR_FATAL,
MSG_INTL(err_reject[rej.rej_type]),
NAME(mlmp), rej.rej_str);
return (0);
}
}
/*
* Establish the modes of the initial object. These modes are
* propagated to any preloaded objects and explicit shared library
* dependencies.
*
* If we're generating a configuration file using crle(1), remove
* any RTLD_NOW use, as we don't want to trigger any relocation proc-
* essing during crle(1)'s first past (this would just be unnecessary
* overhead). Any filters are explicitly loaded, and thus RTLD_NOW is
* not required to trigger filter loading.
*
* Note, RTLD_NOW may have been established during analysis of the
* application had the application been built -z now.
*/
MODE(mlmp) |= (RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD);
if (rtld_flags & RT_FL_CONFGEN) {
MODE(mlmp) |= RTLD_CONFGEN;
MODE(mlmp) &= ~RTLD_NOW;
rtld_flags2 &= ~RT_FL2_BINDNOW;
}
if ((MODE(mlmp) & RTLD_NOW) == 0) {
if (rtld_flags2 & RT_FL2_BINDNOW)
MODE(mlmp) |= RTLD_NOW;
else
MODE(mlmp) |= RTLD_LAZY;
}
/*
* If debugging was requested initialize things now that any cache has
* been established. A user can specify LD_DEBUG=help to discover the
* list of debugging tokens available without running the application.
* However, don't allow this setting from a configuration file.
*
* Note, to prevent recursion issues caused by loading and binding the
* debugging libraries themselves, a local debugging descriptor is
* initialized. Once the debugging setup has completed, this local
* descriptor is copied to the global descriptor which effectively
* enables diagnostic output.
*
* Ignore any debugging request if we're being monitored by a process
* that expects the old getpid() initialization handshake.
*/
if ((rpl_debug || prm_debug) && ((rtld_flags & RT_FL_DEBUGGER) == 0)) {
Dbg_desc _dbg_desc = {0};
struct timeval total = DBG_TOTALTIME;
struct timeval delta = DBG_DELTATIME;
if (rpl_debug) {
if (dbg_setup(rpl_debug, &_dbg_desc) == 0)
return (0);
if (_dbg_desc.d_extra & DBG_E_HELP_EXIT)
rtldexit(&lml_main, 0);
}
if (prm_debug)
(void) dbg_setup(prm_debug, &_dbg_desc);
*dbg_desc = _dbg_desc;
DBG_TOTALTIME = total;
DBG_DELTATIME = delta;
}
/*
* Now that debugging is enabled generate any diagnostics from any
* previous events.
*/
if (DBG_ENABLED) {
DBG_CALL(Dbg_cap_val(&lml_main, org_scapset, alt_scapset,
M_MACH));
DBG_CALL(Dbg_file_config_dis(&lml_main, config->c_name,
features));
DBG_CALL(Dbg_file_ldso(rlmp, envp, auxv,
LIST(rlmp)->lm_lmidstr, ALIST_OFF_DATA));
if (THIS_IS_ELF(mlmp)) {
DBG_CALL(Dbg_file_elf(&lml_main, PATHNAME(mlmp),
ADDR(mlmp), MSIZE(mlmp), LIST(mlmp)->lm_lmidstr,
ALIST_OFF_DATA));
} else {
DBG_CALL(Dbg_file_aout(&lml_main, PATHNAME(mlmp),
ADDR(mlmp), MSIZE(mlmp), LIST(mlmp)->lm_lmidstr,
ALIST_OFF_DATA));
}
}
/*
* Enable auditing.
*/
if (rpl_audit || prm_audit || profile_lib) {
int ndx;
const char *aud[3];
aud[0] = rpl_audit;
aud[1] = prm_audit;
aud[2] = profile_lib;
/*
* Any global auditing (set using LD_AUDIT or LD_PROFILE) that
* can't be established is non-fatal.
*/
if ((auditors = calloc(1, sizeof (Audit_desc))) == NULL)
return (0);
for (ndx = 0; ndx < 3; ndx++) {
if (aud[ndx]) {
if ((auditors->ad_name =
strdup(aud[ndx])) == NULL)
return (0);
rtld_flags2 |= RT_FL2_FTL2WARN;
(void) audit_setup(mlmp, auditors,
PD_FLG_EXTLOAD, NULL);
rtld_flags2 &= ~RT_FL2_FTL2WARN;
}
}
lml_main.lm_tflags |= auditors->ad_flags;
}
if (AUDITORS(mlmp)) {
/*
* Any object required auditing (set with a DT_DEPAUDIT dynamic
* entry) that can't be established is fatal.
*/
if (FLAGS1(mlmp) & FL1_RT_GLOBAUD) {
/*
* If this object requires global auditing, use the
* local auditing information to set the global
* auditing descriptor. The effect is that a
* DT_DEPAUDIT act as an LD_AUDIT.
*/
if ((auditors == NULL) && ((auditors = calloc(1,
sizeof (Audit_desc))) == NULL))
return (0);
auditors->ad_name = AUDITORS(mlmp)->ad_name;
if (audit_setup(mlmp, auditors, 0, NULL) == 0)
return (0);
lml_main.lm_tflags |= auditors->ad_flags;
/*
* Clear the local auditor information.
*/
free((void *) AUDITORS(mlmp));
AUDITORS(mlmp) = NULL;
} else {
/*
* Establish any local auditing.
*/
if (audit_setup(mlmp, AUDITORS(mlmp), 0, NULL) == 0)
return (0);
AFLAGS(mlmp) |= AUDITORS(mlmp)->ad_flags;
lml_main.lm_flags |= LML_FLG_LOCAUDIT;
}
}
/*
* Explicitly add the initial object and ld.so.1 to those objects being
* audited. Note, although the ld.so.1 link-map isn't auditable,
* establish a cookie for ld.so.1 as this may be bound to via the
* dl*() family.
*/
if ((lml_main.lm_tflags | AFLAGS(mlmp)) & LML_TFLG_AUD_MASK) {
if (((audit_objopen(mlmp, mlmp) == 0) ||
(audit_objopen(mlmp, rlmp) == 0)) &&
(AFLAGS(mlmp) & LML_TFLG_AUD_MASK))
return (0);
}
/*
* Map in any preloadable shared objects. Establish the caller as the
* head of the main link-map list. In the case of being exercised from
* lddstub, the caller gets reassigned to the first target shared object
* so as to provide intuitive diagnostics from ldd().
*
* Note, it is valid to preload a 4.x shared object with a 5.0
* executable (or visa-versa), as this functionality is required by
* ldd(1).
*/
clmp = mlmp;
if (rpl_preload && (preload(rpl_preload, mlmp, &clmp) == 0))
return (0);
if (prm_preload && (preload(prm_preload, mlmp, &clmp) == 0))
return (0);
/*
* Load all dependent (needed) objects.
*/
if (analyze_lmc(&lml_main, ALIST_OFF_DATA, mlmp, mlmp, NULL) == NULL)
return (0);
/*
* Relocate all the dependencies we've just added.
*
* If this process has been established via crle(1), the environment
* variable LD_CONFGEN will have been set. crle(1) may create this
* process twice. The first time crle only needs to gather dependency
* information. The second time, is to dldump() the images.
*
* If we're only gathering dependencies, relocation is unnecessary.
* As crle(1) may be building an arbitrary family of objects, they may
* not fully relocate either. Hence the relocation phase is not carried
* out now, but will be called by crle(1) once all objects have been
* loaded.
*/
if ((rtld_flags & RT_FL_CONFGEN) == 0) {
DBG_CALL(Dbg_util_nl(&lml_main, DBG_NL_STD));
if (relocate_lmc(&lml_main, ALIST_OFF_DATA, mlmp,
mlmp, NULL) == 0)
return (0);
/*
* Inform the debuggers that basic process initialization is
* complete, and that the state of ld.so.1 (link-map lists,
* etc.) is stable. This handshake enables the debugger to
* initialize themselves, and consequently allows the user to
* set break points in .init code.
*
* Most new debuggers use librtld_db to monitor activity events.
* Older debuggers indicated their presence by setting the
* DT_DEBUG entry in the dynamic executable (see elf_new_lm()).
* In this case, getpid() is called so that the debugger can
* catch the system call. This old mechanism has some
* restrictions, as getpid() should not be called prior to
* basic process initialization being completed. This
* restriction has become increasingly difficult to maintain,
* as the use of auditors, LD_DEBUG, and the initialization
* handshake with libc can result in "premature" getpid()
* calls. The use of this getpid() handshake is expected to
* disappear at some point in the future, and there is intent
* to work towards that goal.
*/
rd_event(&lml_main, RD_DLACTIVITY, RT_CONSISTENT);
rd_event(&lml_rtld, RD_DLACTIVITY, RT_CONSISTENT);
if (rtld_flags & RT_FL_DEBUGGER) {
r_debug.rtd_rdebug.r_flags |= RD_FL_ODBG;
(void) getpid();
}
}
/*
* Indicate preinit activity, and call any auditing routines. These
* routines are called before initializing any threads via libc, or
* before collecting the complete set of .inits on the primary link-map.
* Although most libc interfaces are encapsulated in local routines
* within libc, they have been known to escape (ie. call a .plt). As
* the appcert auditor uses preinit as a trigger to establish some
* external interfaces to the main link-maps libc, we need to activate
* this trigger before exercising any code within libc. Additionally,
* I wouldn't put it past an auditor to add additional objects to the
* primary link-map. Hence, we collect .inits after the audit call.
*/
rd_event(&lml_main, RD_PREINIT, 0);
if (aud_activity ||
((lml_main.lm_tflags | AFLAGS(mlmp)) & LML_TFLG_AUD_ACTIVITY))
audit_activity(mlmp, LA_ACT_CONSISTENT);
if (aud_preinit ||
((lml_main.lm_tflags | AFLAGS(mlmp)) & LML_TFLG_AUD_PREINIT))
audit_preinit(mlmp);
/*
* If we're creating initial configuration information, we're done
* now that the auditing step has been called.
*/
if (rtld_flags & RT_FL_CONFGEN) {
leave(LIST(mlmp), 0);
return (mlmp);
}
/*
* Sort the .init sections of all objects we've added. If we're
* tracing we only need to execute this under ldd(1) with the -i or -u
* options.
*/
lmflags = lml_main.lm_flags;
if (((lmflags & LML_FLG_TRC_ENABLE) == 0) ||
(lmflags & (LML_FLG_TRC_INIT | LML_FLG_TRC_UNREF))) {
if ((tobj = tsort(mlmp, LIST(mlmp)->lm_init,
RT_SORT_REV)) == (Rt_map **)S_ERROR)
return (0);
}
/*
* If we are tracing we're done. This is the one legitimate use of a
* direct call to rtldexit() rather than return, as we don't want to
* return and jump to the application.
*/
if (lmflags & LML_FLG_TRC_ENABLE) {
unused(&lml_main);
rtldexit(&lml_main, 0);
}
/*
* Check if this instance of the linker should have a primary link
* map. This flag allows multiple copies of the -same- -version-
* of the linker (and libc) to run in the same address space.
*
* Without this flag we only support one copy of the linker in a
* process because by default the linker will always try to
* initialize at one primary link map The copy of libc which is
* initialized on a primary link map will initialize global TLS
* data which can be shared with other copies of libc in the
* process. The problem is that if there is more than one copy
* of the linker, only one copy should link libc onto a primary
* link map, otherwise libc will attempt to re-initialize global
* TLS data. So when a copy of the linker is loaded with this
* flag set, it will not initialize any primary link maps since
* presumably another copy of the linker will do this.
*
* Note that this flag only allows multiple copies of the -same-
* -version- of the linker (and libc) to coexist. This approach
* will not work if we are trying to load different versions of
* the linker and libc into the same process. The reason for
* this is that the format of the global TLS data may not be
* the same for different versions of libc. In this case each
* different version of libc must have it's own primary link map
* and be able to maintain it's own TLS data. The only way this
* can be done is by carefully managing TLS pointers on transitions
* between code associated with each of the different linkers.
* Note that this is actually what is done for processes in lx
* branded zones. Although in the lx branded zone case, the
* other linker and libc are actually gld and glibc. But the
* same general TLS management mechanism used by the lx brand
* would apply to any attempts to run multiple versions of the
* solaris linker and libc in a single process.
*/
if (auxflags & AF_SUN_NOPLM)
rtld_flags2 |= RT_FL2_NOPLM;
/*
* Establish any static TLS for this primary link-map. Note, regardless
* of whether TLS is available, an initial handshake occurs with libc to
* indicate we're processing the primary link-map. Having identified
* the primary link-map, initialize threads.
*/
if (rt_get_extern(&lml_main, mlmp) == 0)
return (0);
if ((rtld_flags2 & RT_FL2_NOPLM) == 0) {
if (tls_statmod(&lml_main, mlmp) == 0)
return (0);
rt_thr_init(&lml_main);
rtld_flags2 |= RT_FL2_PLMSETUP;
} else {
rt_thr_init(&lml_main);
}
/*
* Fire all dependencies .init sections. Identify any unused
* dependencies, and leave the runtime linker - effectively calling
* the dynamic executables entry point.
*/
call_array(PREINITARRAY(mlmp), (uint_t)PREINITARRAYSZ(mlmp), mlmp,
SHT_PREINIT_ARRAY);
if (tobj)
call_init(tobj, DBG_INIT_SORT);
rd_event(&lml_main, RD_POSTINIT, 0);
unused(&lml_main);
DBG_CALL(Dbg_util_call_main(mlmp));
rtld_flags |= (RT_FL_OPERATION | RT_FL_APPLIC);
leave(LIST(mlmp), 0);
return (mlmp);
}