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Introduce link_map_audit_state accessor function
To improve GCC 10 compatibility, it is necessary to remove the l_audit zero-length array from the end of struct link_map. In preparation of that, this commit introduces an accessor function for the audit state, so that it is possible to change the representation of the audit state without adjusting the code that accesses it. Tested on x86_64-linux-gnu. Built on i686-gnu. Change-Id: Id815673c29950fc011ae5301d7cde12624f658df
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@ -272,7 +272,7 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->preinit != NULL)
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afct->preinit (&head->l_audit[cnt].cookie);
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afct->preinit (&link_map_audit_state (head, cnt)->cookie);
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afct = afct->next;
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}
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@ -302,8 +302,12 @@ _dl_close_worker (struct link_map *map, bool force)
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->objclose != NULL)
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/* Return value is ignored. */
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(void) afct->objclose (&imap->l_audit[cnt].cookie);
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{
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struct auditstate *state
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= link_map_audit_state (imap, cnt);
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/* Return value is ignored. */
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(void) afct->objclose (&state->cookie);
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}
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afct = afct->next;
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}
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@ -478,7 +482,10 @@ _dl_close_worker (struct link_map *map, bool force)
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&head->l_audit[cnt].cookie, LA_ACT_DELETE);
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{
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struct auditstate *state = link_map_audit_state (head, cnt);
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afct->activity (&state->cookie, LA_ACT_DELETE);
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}
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afct = afct->next;
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}
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@ -774,7 +781,10 @@ _dl_close_worker (struct link_map *map, bool force)
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);
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{
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struct auditstate *state = link_map_audit_state (head, cnt);
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afct->activity (&state->cookie, LA_ACT_CONSISTENT);
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}
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afct = afct->next;
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}
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@ -152,9 +152,12 @@ _dl_fini (void)
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->objclose != NULL)
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/* Return value is ignored. */
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(void) afct->objclose (&l->l_audit[cnt].cookie);
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{
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struct auditstate *state
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= link_map_audit_state (l, cnt);
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/* Return value is ignored. */
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(void) afct->objclose (&state->cookie);
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}
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afct = afct->next;
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}
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}
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@ -973,7 +973,8 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&head->l_audit[cnt].cookie, LA_ACT_ADD);
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afct->activity (&link_map_audit_state (head, cnt)->cookie,
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LA_ACT_ADD);
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afct = afct->next;
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}
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@ -1402,10 +1403,9 @@ cannot enable executable stack as shared object requires");
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{
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if (afct->objopen != NULL)
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{
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l->l_audit[cnt].bindflags
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= afct->objopen (l, nsid, &l->l_audit[cnt].cookie);
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l->l_audit_any_plt |= l->l_audit[cnt].bindflags != 0;
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struct auditstate *state = link_map_audit_state (l, cnt);
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state->bindflags = afct->objopen (l, nsid, &state->cookie);
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l->l_audit_any_plt |= state->bindflags != 0;
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}
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afct = afct->next;
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@ -1511,8 +1511,8 @@ open_verify (const char *name, int fd,
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{
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if (afct->objsearch != NULL)
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{
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name = afct->objsearch (name, &loader->l_audit[cnt].cookie,
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whatcode);
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struct auditstate *state = link_map_audit_state (loader, cnt);
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name = afct->objsearch (name, &state->cookie, whatcode);
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if (name == NULL)
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/* Ignore the path. */
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return -1;
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@ -1970,8 +1970,8 @@ _dl_map_object (struct link_map *loader, const char *name,
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if (afct->objsearch != NULL)
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{
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const char *before = name;
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name = afct->objsearch (name, &loader->l_audit[cnt].cookie,
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LA_SER_ORIG);
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struct auditstate *state = link_map_audit_state (loader, cnt);
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name = afct->objsearch (name, &state->cookie, LA_SER_ORIG);
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if (name == NULL)
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{
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/* Do not try anything further. */
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@ -81,7 +81,7 @@ _dl_new_object (char *realname, const char *libname, int type,
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struct link_map *new;
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struct libname_list *newname;
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#ifdef SHARED
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size_t audit_space = naudit * sizeof (new->l_audit[0]);
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size_t audit_space = naudit * sizeof (struct auditstate);
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#else
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# define audit_space 0
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#endif
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@ -134,10 +134,8 @@ _dl_new_object (char *realname, const char *libname, int type,
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#ifdef SHARED
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for (unsigned int cnt = 0; cnt < naudit; ++cnt)
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{
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new->l_audit[cnt].cookie = (uintptr_t) new;
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/* new->l_audit[cnt].bindflags = 0; */
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}
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/* No need to initialize bindflags due to calloc. */
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link_map_audit_state (new, cnt)->cookie = (uintptr_t) new;
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#endif
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/* new->l_global = 0; We use calloc therefore not necessary. */
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@ -278,7 +278,10 @@ dl_open_worker (void *a)
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);
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{
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struct auditstate *state = link_map_audit_state (head, cnt);
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afct->activity (&state->cookie, LA_ACT_CONSISTENT);
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}
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afct = afct->next;
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}
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@ -325,15 +325,18 @@ _dl_profile_fixup (
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{
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/* XXX Check whether both DSOs must request action or
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only one */
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if ((l->l_audit[cnt].bindflags & LA_FLG_BINDFROM) != 0
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&& (result->l_audit[cnt].bindflags & LA_FLG_BINDTO) != 0)
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struct auditstate *l_state = link_map_audit_state (l, cnt);
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struct auditstate *result_state
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= link_map_audit_state (result, cnt);
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if ((l_state->bindflags & LA_FLG_BINDFROM) != 0
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&& (result_state->bindflags & LA_FLG_BINDTO) != 0)
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{
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if (afct->symbind != NULL)
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{
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uintptr_t new_value
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= afct->symbind (&sym, reloc_result->boundndx,
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&l->l_audit[cnt].cookie,
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&result->l_audit[cnt].cookie,
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&l_state->cookie,
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&result_state->cookie,
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&flags,
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strtab2 + defsym->st_name);
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if (new_value != (uintptr_t) sym.st_value)
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@ -421,10 +424,13 @@ _dl_profile_fixup (
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& (LA_SYMB_NOPLTENTER << (2 * (cnt + 1)))) == 0)
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{
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long int new_framesize = -1;
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struct auditstate *l_state = link_map_audit_state (l, cnt);
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struct auditstate *bound_state
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= link_map_audit_state (reloc_result->bound, cnt);
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uintptr_t new_value
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= afct->ARCH_LA_PLTENTER (&sym, reloc_result->boundndx,
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&l->l_audit[cnt].cookie,
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&reloc_result->bound->l_audit[cnt].cookie,
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&l_state->cookie,
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&bound_state->cookie,
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regs, &flags, symname,
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&new_framesize);
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if (new_value != (uintptr_t) sym.st_value)
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@ -504,9 +510,11 @@ _dl_call_pltexit (struct link_map *l, ElfW(Word) reloc_arg,
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&& (reloc_result->enterexit
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& (LA_SYMB_NOPLTEXIT >> (2 * cnt))) == 0)
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{
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struct auditstate *l_state = link_map_audit_state (l, cnt);
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struct auditstate *bound_state
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= link_map_audit_state (reloc_result->bound, cnt);
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afct->ARCH_LA_PLTEXIT (&sym, reloc_result->boundndx,
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&l->l_audit[cnt].cookie,
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&reloc_result->bound->l_audit[cnt].cookie,
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&l_state->cookie, &bound_state->cookie,
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inregs, outregs, symname);
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}
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13
elf/dl-sym.c
13
elf/dl-sym.c
@ -198,17 +198,20 @@ RTLD_NEXT used in code not dynamically loaded"));
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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struct auditstate *match_audit
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= link_map_audit_state (match, cnt);
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struct auditstate *result_audit
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= link_map_audit_state (result, cnt);
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if (afct->symbind != NULL
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&& ((match->l_audit[cnt].bindflags & LA_FLG_BINDFROM)
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!= 0
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|| ((result->l_audit[cnt].bindflags & LA_FLG_BINDTO)
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&& ((match_audit->bindflags & LA_FLG_BINDFROM) != 0
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|| ((result_audit->bindflags & LA_FLG_BINDTO)
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!= 0)))
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{
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unsigned int flags = altvalue | LA_SYMB_DLSYM;
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uintptr_t new_value
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= afct->symbind (&sym, ndx,
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&match->l_audit[cnt].cookie,
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&result->l_audit[cnt].cookie,
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&match_audit->cookie,
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&result_audit->cookie,
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&flags, strtab + ref->st_name);
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if (new_value != (uintptr_t) sym.st_value)
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{
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elf/rtld.c
18
elf/rtld.c
@ -1025,9 +1025,9 @@ ERROR: audit interface '%s' requires version %d (maximum supported version %d);
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else
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*last_audit = (*last_audit)->next = &newp->ifaces;
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/* The dynamic linker link map is statically allocated, initialize
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the data now. */
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GL (dl_rtld_map).l_audit[GLRO (dl_naudit)].cookie
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/* The dynamic linker link map is statically allocated, so the
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cookie in _dl_new_object has not happened. */
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link_map_audit_state (&GL (dl_rtld_map), GLRO (dl_naudit))->cookie
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= (intptr_t) &GL (dl_rtld_map);
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++GLRO(dl_naudit);
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@ -1046,9 +1046,9 @@ notify_audit_modules_of_loaded_object (struct link_map *map)
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{
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if (afct->objopen != NULL)
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{
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map->l_audit[cnt].bindflags
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= afct->objopen (map, LM_ID_BASE, &map->l_audit[cnt].cookie);
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map->l_audit_any_plt |= map->l_audit[cnt].bindflags != 0;
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struct auditstate *state = link_map_audit_state (map, cnt);
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state->bindflags = afct->objopen (map, LM_ID_BASE, &state->cookie);
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map->l_audit_any_plt |= state->bindflags != 0;
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}
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afct = afct->next;
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@ -1662,7 +1662,8 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&main_map->l_audit[cnt].cookie, LA_ACT_ADD);
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afct->activity (&link_map_audit_state (main_map, cnt)->cookie,
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LA_ACT_ADD);
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afct = afct->next;
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}
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@ -2333,7 +2334,8 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->activity != NULL)
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afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);
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afct->activity (&link_map_audit_state (head, cnt)->cookie,
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LA_ACT_CONSISTENT);
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afct = afct->next;
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}
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@ -1174,7 +1174,13 @@ rtld_active (void)
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initialized and active ld.so copy. */
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return GLRO(dl_init_all_dirs) != NULL;
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}
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#endif
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static inline struct auditstate *
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link_map_audit_state (struct link_map *l, size_t index)
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{
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return &l->l_audit[index];
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}
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#endif /* SHARED */
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__END_DECLS
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