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elf: Add _dl_audit_pltenter
It consolidates the code required to call la_pltenter audit callback. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Adhemerval Zanella
parent
0b98a87487
commit
eff687e846
@ -17,7 +17,9 @@
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <link.h>
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#include <ldsodefs.h>
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#include <dl-machine.h>
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void
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_dl_audit_activity_map (struct link_map *l, int action)
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@ -243,3 +245,78 @@ _dl_audit_symbind (struct link_map *l, struct reloc_result *reloc_result,
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reloc_result->flags = flags;
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*value = DL_FIXUP_ADDR_VALUE (sym.st_value);
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}
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void
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_dl_audit_pltenter (struct link_map *l, struct reloc_result *reloc_result,
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DL_FIXUP_VALUE_TYPE *value, void *regs, long int *framesize)
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{
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/* Don't do anything if no auditor wants to intercept this call. */
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if (GLRO(dl_naudit) == 0
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|| (reloc_result->enterexit & LA_SYMB_NOPLTENTER))
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return;
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/* Sanity check: DL_FIXUP_VALUE_CODE_ADDR (value) should have been
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initialized earlier in this function or in another thread. */
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assert (DL_FIXUP_VALUE_CODE_ADDR (*value) != 0);
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ElfW(Sym) *defsym = ((ElfW(Sym) *) D_PTR (reloc_result->bound,
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l_info[DT_SYMTAB])
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+ reloc_result->boundndx);
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/* Set up the sym parameter. */
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ElfW(Sym) sym = *defsym;
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sym.st_value = DL_FIXUP_VALUE_ADDR (*value);
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/* Get the symbol name. */
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const char *strtab = (const void *) D_PTR (reloc_result->bound,
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l_info[DT_STRTAB]);
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const char *symname = strtab + sym.st_name;
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/* Keep track of overwritten addresses. */
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unsigned int flags = reloc_result->flags;
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struct audit_ifaces *afct = GLRO(dl_audit);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->ARCH_LA_PLTENTER != NULL
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&& (reloc_result->enterexit
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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_state->cookie, &bound_state->cookie,
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regs, &flags, symname, &new_framesize);
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if (new_value != (uintptr_t) sym.st_value)
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{
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flags |= LA_SYMB_ALTVALUE;
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sym.st_value = new_value;
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}
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/* Remember the results for every audit library and store a summary
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in the first two bits. */
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reloc_result->enterexit |= ((flags & (LA_SYMB_NOPLTENTER
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| LA_SYMB_NOPLTEXIT))
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<< (2 * (cnt + 1)));
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if ((reloc_result->enterexit & (LA_SYMB_NOPLTEXIT
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<< (2 * (cnt + 1))))
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== 0 && new_framesize != -1 && *framesize != -2)
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{
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/* If this is the first call providing information, use it. */
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if (*framesize == -1)
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*framesize = new_framesize;
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/* If two pltenter calls provide conflicting information, use
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the larger value. */
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else if (new_framesize != *framesize)
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*framesize = MAX (new_framesize, *framesize);
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}
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}
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afct = afct->next;
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}
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*value = DL_FIXUP_ADDR_VALUE (sym.st_value);
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}
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@ -320,78 +320,7 @@ _dl_profile_fixup (
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#ifdef SHARED
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/* Auditing checkpoint: report the PLT entering and allow the
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auditors to change the value. */
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if (GLRO(dl_naudit) > 0
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/* Don't do anything if no auditor wants to intercept this call. */
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&& (reloc_result->enterexit & LA_SYMB_NOPLTENTER) == 0)
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{
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/* Sanity check: DL_FIXUP_VALUE_CODE_ADDR (value) should have been
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initialized earlier in this function or in another thread. */
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assert (DL_FIXUP_VALUE_CODE_ADDR (value) != 0);
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ElfW(Sym) *defsym = ((ElfW(Sym) *) D_PTR (reloc_result->bound,
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l_info[DT_SYMTAB])
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+ reloc_result->boundndx);
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/* Set up the sym parameter. */
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ElfW(Sym) sym = *defsym;
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sym.st_value = DL_FIXUP_VALUE_ADDR (value);
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/* Get the symbol name. */
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const char *strtab = (const void *) D_PTR (reloc_result->bound,
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l_info[DT_STRTAB]);
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const char *symname = strtab + sym.st_name;
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/* Keep track of overwritten addresses. */
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unsigned int flags = reloc_result->flags;
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struct audit_ifaces *afct = GLRO(dl_audit);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->ARCH_LA_PLTENTER != NULL
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&& (reloc_result->enterexit
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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_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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{
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flags |= LA_SYMB_ALTVALUE;
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sym.st_value = new_value;
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}
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/* Remember the results for every audit library and
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store a summary in the first two bits. */
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reloc_result->enterexit
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|= ((flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT))
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<< (2 * (cnt + 1)));
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if ((reloc_result->enterexit & (LA_SYMB_NOPLTEXIT
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<< (2 * (cnt + 1))))
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== 0 && new_framesize != -1 && framesize != -2)
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{
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/* If this is the first call providing information,
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use it. */
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if (framesize == -1)
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framesize = new_framesize;
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/* If two pltenter calls provide conflicting information,
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use the larger value. */
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else if (new_framesize != framesize)
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framesize = MAX (new_framesize, framesize);
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}
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}
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afct = afct->next;
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}
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value = DL_FIXUP_ADDR_VALUE (sym.st_value);
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}
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_dl_audit_pltenter (l, reloc_result, &value, regs, &framesize);
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#endif
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/* Store the frame size information. */
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@ -1434,6 +1434,10 @@ void _dl_audit_symbind (struct link_map *l, struct reloc_result *reloc_result,
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void _dl_audit_symbind_alt (struct link_map *l, const ElfW(Sym) *ref,
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void **value, lookup_t result);
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rtld_hidden_proto (_dl_audit_symbind_alt)
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void _dl_audit_pltenter (struct link_map *l, struct reloc_result *reloc_result,
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DL_FIXUP_VALUE_TYPE *value, void *regs,
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long int *framesize)
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attribute_hidden;
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#endif /* SHARED */
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#if PTHREAD_IN_LIBC && defined SHARED
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