From: Carlos O'Donell <carlos@redhat.com>
To: libc-stable@sourceware.org
Cc: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
Florian Weimer <fweimer@redhat.com>
Subject: [PATCH 12/27] elf: Add _dl_audit_symbind_alt and _dl_audit_symbind
Date: Tue, 12 Apr 2022 14:41:50 -0400 [thread overview]
Message-ID: <20220412184205.3343677-13-carlos@redhat.com> (raw)
In-Reply-To: <20220412184205.3343677-1-carlos@redhat.com>
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
It consolidates the code required to call la_symbind{32,64} audit
callback.
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit cda4f265c65fb6c4ce38ca1cf0a7e527c5e77cd5)
---
elf/Versions | 1 +
elf/dl-audit.c | 122 +++++++++++++++++++++++++++++++++++++
elf/dl-runtime.c | 79 +-----------------------
elf/dl-sym-post.h | 47 +-------------
sysdeps/generic/ldsodefs.h | 10 +++
5 files changed, 135 insertions(+), 124 deletions(-)
diff --git a/elf/Versions b/elf/Versions
index 2af210b8f7..164682eaea 100644
--- a/elf/Versions
+++ b/elf/Versions
@@ -58,6 +58,7 @@ ld {
_dl_argv; _dl_find_dso_for_object; _dl_get_tls_static_info;
_dl_deallocate_tls; _dl_make_stack_executable;
_dl_rtld_di_serinfo; _dl_starting_up; _dl_fatal_printf;
+ _dl_audit_symbind_alt;
_rtld_global; _rtld_global_ro;
# Only here for gdb while a better method is developed.
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index cb1c3de93c..a21530f30b 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <assert.h>
#include <ldsodefs.h>
void
@@ -106,3 +107,124 @@ _dl_audit_objclose (struct link_map *l)
afct = afct->next;
}
}
+
+void
+_dl_audit_symbind_alt (struct link_map *l, const ElfW(Sym) *ref, void **value,
+ lookup_t result)
+{
+ if ((l->l_audit_any_plt | result->l_audit_any_plt) == 0)
+ return;
+
+ const char *strtab = (const char *) D_PTR (result, l_info[DT_STRTAB]);
+ /* Compute index of the symbol entry in the symbol table of the DSO with
+ the definition. */
+ unsigned int ndx = (ref - (ElfW(Sym) *) D_PTR (result, l_info[DT_SYMTAB]));
+
+ unsigned int altvalue = 0;
+ /* Synthesize a symbol record where the st_value field is the result. */
+ ElfW(Sym) sym = *ref;
+ sym.st_value = (ElfW(Addr)) *value;
+
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ struct auditstate *match_audit = link_map_audit_state (l, cnt);
+ struct auditstate *result_audit = link_map_audit_state (result, cnt);
+ if (afct->symbind != NULL
+ && ((match_audit->bindflags & LA_FLG_BINDFROM) != 0
+ || ((result_audit->bindflags & LA_FLG_BINDTO)
+ != 0)))
+ {
+ unsigned int flags = altvalue | LA_SYMB_DLSYM;
+ uintptr_t new_value = afct->symbind (&sym, ndx,
+ &match_audit->cookie,
+ &result_audit->cookie,
+ &flags, strtab + ref->st_name);
+ if (new_value != (uintptr_t) sym.st_value)
+ {
+ altvalue = LA_SYMB_ALTVALUE;
+ sym.st_value = new_value;
+ }
+
+ afct = afct->next;
+ }
+
+ *value = (void *) sym.st_value;
+ }
+}
+rtld_hidden_def (_dl_audit_symbind_alt)
+
+void
+_dl_audit_symbind (struct link_map *l, struct reloc_result *reloc_result,
+ const ElfW(Sym) *defsym, DL_FIXUP_VALUE_TYPE *value,
+ lookup_t result)
+{
+ reloc_result->bound = result;
+ /* Compute index of the symbol entry in the symbol table of the DSO with the
+ definition. */
+ reloc_result->boundndx = (defsym - (ElfW(Sym) *) D_PTR (result,
+ l_info[DT_SYMTAB]));
+
+ if ((l->l_audit_any_plt | result->l_audit_any_plt) == 0)
+ {
+ /* Set all bits since this symbol binding is not interesting. */
+ reloc_result->enterexit = (1u << DL_NNS) - 1;
+ return;
+ }
+
+ /* Synthesize a symbol record where the st_value field is the result. */
+ ElfW(Sym) sym = *defsym;
+ sym.st_value = DL_FIXUP_VALUE_ADDR (*value);
+
+ /* Keep track whether there is any interest in tracing the call in the lower
+ two bits. */
+ assert (DL_NNS * 2 <= sizeof (reloc_result->flags) * 8);
+ assert ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT) == 3);
+ reloc_result->enterexit = LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT;
+
+ const char *strtab2 = (const void *) D_PTR (result, l_info[DT_STRTAB]);
+
+ unsigned int flags = 0;
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ /* XXX Check whether both DSOs must request action or only one */
+ struct auditstate *l_state = link_map_audit_state (l, cnt);
+ struct auditstate *result_state = link_map_audit_state (result, cnt);
+ if ((l_state->bindflags & LA_FLG_BINDFROM) != 0
+ && (result_state->bindflags & LA_FLG_BINDTO) != 0)
+ {
+ if (afct->symbind != NULL)
+ {
+ uintptr_t new_value = afct->symbind (&sym,
+ reloc_result->boundndx,
+ &l_state->cookie,
+ &result_state->cookie,
+ &flags,
+ strtab2 + defsym->st_name);
+ if (new_value != (uintptr_t) sym.st_value)
+ {
+ flags |= LA_SYMB_ALTVALUE;
+ sym.st_value = new_value;
+ }
+ }
+
+ /* Remember the results for every audit library and store a summary
+ in the first two bits. */
+ reloc_result->enterexit &= flags & (LA_SYMB_NOPLTENTER
+ | LA_SYMB_NOPLTEXIT);
+ reloc_result->enterexit |= ((flags & (LA_SYMB_NOPLTENTER
+ | LA_SYMB_NOPLTEXIT))
+ << ((cnt + 1) * 2));
+ }
+ else
+ /* If the bind flags say this auditor is not interested, set the bits
+ manually. */
+ reloc_result->enterexit |= ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT)
+ << ((cnt + 1) * 2));
+ afct = afct->next;
+ }
+
+ reloc_result->flags = flags;
+ *value = DL_FIXUP_ADDR_VALUE (sym.st_value);
+}
diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
index 61c260ddb8..c4413c9165 100644
--- a/elf/dl-runtime.c
+++ b/elf/dl-runtime.c
@@ -297,84 +297,7 @@ _dl_profile_fixup (
auditing libraries the possibility to change the value and
tell us whether further auditing is wanted. */
if (defsym != NULL && GLRO(dl_naudit) > 0)
- {
- reloc_result->bound = result;
- /* Compute index of the symbol entry in the symbol table of
- the DSO with the definition. */
- reloc_result->boundndx = (defsym
- - (ElfW(Sym) *) D_PTR (result,
- l_info[DT_SYMTAB]));
-
- /* Determine whether any of the two participating DSOs is
- interested in auditing. */
- if ((l->l_audit_any_plt | result->l_audit_any_plt) != 0)
- {
- unsigned int flags = 0;
- struct audit_ifaces *afct = GLRO(dl_audit);
- /* Synthesize a symbol record where the st_value field is
- the result. */
- ElfW(Sym) sym = *defsym;
- sym.st_value = DL_FIXUP_VALUE_ADDR (value);
-
- /* Keep track whether there is any interest in tracing
- the call in the lower two bits. */
- assert (DL_NNS * 2 <= sizeof (reloc_result->flags) * 8);
- assert ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT) == 3);
- reloc_result->enterexit = LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT;
-
- const char *strtab2 = (const void *) D_PTR (result,
- l_info[DT_STRTAB]);
-
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- /* XXX Check whether both DSOs must request action or
- only one */
- struct auditstate *l_state = link_map_audit_state (l, cnt);
- struct auditstate *result_state
- = link_map_audit_state (result, cnt);
- if ((l_state->bindflags & LA_FLG_BINDFROM) != 0
- && (result_state->bindflags & LA_FLG_BINDTO) != 0)
- {
- if (afct->symbind != NULL)
- {
- uintptr_t new_value
- = afct->symbind (&sym, reloc_result->boundndx,
- &l_state->cookie,
- &result_state->cookie,
- &flags,
- strtab2 + defsym->st_name);
- if (new_value != (uintptr_t) sym.st_value)
- {
- flags |= LA_SYMB_ALTVALUE;
- sym.st_value = new_value;
- }
- }
-
- /* Remember the results for every audit library and
- store a summary in the first two bits. */
- reloc_result->enterexit
- &= flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT);
- reloc_result->enterexit
- |= ((flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT))
- << ((cnt + 1) * 2));
- }
- else
- /* If the bind flags say this auditor is not interested,
- set the bits manually. */
- reloc_result->enterexit
- |= ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT)
- << ((cnt + 1) * 2));
-
- afct = afct->next;
- }
-
- reloc_result->flags = flags;
- value = DL_FIXUP_ADDR_VALUE (sym.st_value);
- }
- else
- /* Set all bits since this symbol binding is not interesting. */
- reloc_result->enterexit = (1u << DL_NNS) - 1;
- }
+ _dl_audit_symbind (l, reloc_result, defsym, &value, result);
#endif
/* Store the result for later runs. */
diff --git a/elf/dl-sym-post.h b/elf/dl-sym-post.h
index d68c2d2b1c..a11095d3e8 100644
--- a/elf/dl-sym-post.h
+++ b/elf/dl-sym-post.h
@@ -52,54 +52,9 @@ _dl_sym_post (lookup_t result, const ElfW(Sym) *ref, void *value,
tell us whether further auditing is wanted. */
if (__glibc_unlikely (GLRO(dl_naudit) > 0))
{
- const char *strtab = (const char *) D_PTR (result,
- l_info[DT_STRTAB]);
- /* Compute index of the symbol entry in the symbol table of
- the DSO with the definition. */
- unsigned int ndx = (ref - (ElfW(Sym) *) D_PTR (result,
- l_info[DT_SYMTAB]));
-
if (match == NULL)
match = _dl_sym_find_caller_link_map (caller);
-
- if ((match->l_audit_any_plt | result->l_audit_any_plt) != 0)
- {
- unsigned int altvalue = 0;
- struct audit_ifaces *afct = GLRO(dl_audit);
- /* Synthesize a symbol record where the st_value field is
- the result. */
- ElfW(Sym) sym = *ref;
- sym.st_value = (ElfW(Addr)) value;
-
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- struct auditstate *match_audit
- = link_map_audit_state (match, cnt);
- struct auditstate *result_audit
- = link_map_audit_state (result, cnt);
- if (afct->symbind != NULL
- && ((match_audit->bindflags & LA_FLG_BINDFROM) != 0
- || ((result_audit->bindflags & LA_FLG_BINDTO)
- != 0)))
- {
- unsigned int flags = altvalue | LA_SYMB_DLSYM;
- uintptr_t new_value
- = afct->symbind (&sym, ndx,
- &match_audit->cookie,
- &result_audit->cookie,
- &flags, strtab + ref->st_name);
- if (new_value != (uintptr_t) sym.st_value)
- {
- altvalue = LA_SYMB_ALTVALUE;
- sym.st_value = new_value;
- }
- }
-
- afct = afct->next;
- }
-
- value = (void *) sym.st_value;
- }
+ _dl_audit_symbind_alt (match, ref, &value, result);
}
#endif
return value;
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index ee77c1a2a6..be5f3d16ca 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1386,6 +1386,16 @@ void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
/* Call the la_objclose from the audit modules for the link_map L. */
void _dl_audit_objclose (struct link_map *l)
attribute_hidden;
+
+/* Call the la_symbind{32,64} from the audit modules for the link_map L. */
+void _dl_audit_symbind (struct link_map *l, struct reloc_result *reloc_result,
+ const ElfW(Sym) *defsym, DL_FIXUP_VALUE_TYPE *value,
+ lookup_t result)
+ attribute_hidden;
+/* Same as _dl_audit_symbind, but also sets LA_SYMB_DLSYM flag. */
+void _dl_audit_symbind_alt (struct link_map *l, const ElfW(Sym) *ref,
+ void **value, lookup_t result);
+rtld_hidden_proto (_dl_audit_symbind_alt)
#endif /* SHARED */
#if PTHREAD_IN_LIBC && defined SHARED
--
2.35.1
next prev parent reply other threads:[~2022-04-12 18:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-12 18:41 [PATCH 00/27] Improve LD_AUDIT support in glibc 2.34 Carlos O'Donell
2022-04-12 18:41 ` [PATCH 01/27] powerpc: Delete unneeded ELF_MACHINE_BEFORE_RTLD_RELOC Carlos O'Donell
2022-04-12 18:41 ` [PATCH 02/27] elf: Avoid nested functions in the loader [BZ #27220] Carlos O'Donell
2022-04-12 18:41 ` [PATCH 03/27] elf: Fix elf_get_dynamic_info definition Carlos O'Donell
2022-04-12 18:41 ` [PATCH 04/27] elf: Fix dynamic-link.h usage on rtld.c Carlos O'Donell
2022-04-12 18:41 ` [PATCH 05/27] elf: Fix elf_get_dynamic_info() for bootstrap Carlos O'Donell
2022-04-12 18:41 ` [PATCH 06/27] elf: Move LAV_CURRENT to link_lavcurrent.h Carlos O'Donell
2022-04-12 18:41 ` [PATCH 07/27] elf: Move la_activity (LA_ACT_ADD) after _dl_add_to_namespace_list() (BZ #28062) Carlos O'Donell
2022-04-12 18:41 ` [PATCH 08/27] elf: Add _dl_audit_objopen Carlos O'Donell
2022-04-12 18:41 ` [PATCH 09/27] elf: Add _dl_audit_activity_map and _dl_audit_activity_nsid Carlos O'Donell
2022-04-12 18:41 ` [PATCH 10/27] elf: Add _dl_audit_objsearch Carlos O'Donell
2022-04-12 18:41 ` [PATCH 11/27] elf: Add _dl_audit_objclose Carlos O'Donell
2022-04-12 18:41 ` Carlos O'Donell [this message]
2022-04-12 18:41 ` [PATCH 13/27] elf: Add _dl_audit_preinit Carlos O'Donell
2022-04-12 18:41 ` [PATCH 14/27] elf: Add _dl_audit_pltenter Carlos O'Donell
2022-04-12 18:41 ` [PATCH 15/27] elf: Add _dl_audit_pltexit Carlos O'Donell
2022-04-12 18:41 ` [PATCH 16/27] elf: Avoid unnecessary slowdown from profiling with audit (BZ#15533) Carlos O'Donell
2022-04-12 18:41 ` [PATCH 17/27] elf: Add audit tests for modules with TLSDESC Carlos O'Donell
2022-04-12 18:41 ` [PATCH 18/27] elf: Issue audit la_objopen for vDSO Carlos O'Donell
2022-04-12 18:41 ` [PATCH 19/27] elf: Do not fail for failed dlmopen on audit modules (BZ #28061) Carlos O'Donell
2022-04-12 18:41 ` [PATCH 20/27] elf: Add la_activity during application exit Carlos O'Donell
2022-04-12 18:41 ` [PATCH 21/27] elf: Fix initial-exec TLS access on audit modules (BZ #28096) Carlos O'Donell
2022-04-12 18:42 ` [PATCH 22/27] elf: Issue la_symbind for bind-now (BZ #23734) Carlos O'Donell
2022-04-12 18:42 ` [PATCH 23/27] elf: Fix runtime linker auditing on aarch64 (BZ #26643) Carlos O'Donell
2022-04-12 18:42 ` [PATCH 24/27] Fix elf/tst-audit25a with default bind now toolchains Carlos O'Donell
2022-04-12 18:42 ` [PATCH 25/27] elf: Replace tst-audit24bmod2.so with tst-audit24bmod2 Carlos O'Donell
2022-04-12 18:42 ` [PATCH 26/27] hppa: Fix bind-now audit (BZ #28857) Carlos O'Donell
2022-04-12 18:42 ` [PATCH 27/27] NEWS: Update fixed bug list for LD_AUDIT backports Carlos O'Donell
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