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206 lines
6.9 KiB
206 lines
6.9 KiB
9 months ago
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commit eff687e8462b0eaf65992a6031b54a4b1cd16796
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Thu Jul 22 17:45:33 2021 -0300
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elf: Add _dl_audit_pltenter
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It consolidates the code required to call la_pltenter audit
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callback.
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Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
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Reviewed-by: Florian Weimer <fweimer@redhat.com>
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diff --git a/elf/dl-audit.c b/elf/dl-audit.c
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index 0b6fac8e48877c93..15250c67e8ac1658 100644
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--- a/elf/dl-audit.c
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+++ b/elf/dl-audit.c
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@@ -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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+
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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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+
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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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+
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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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+
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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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+
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+ /* Keep track of overwritten addresses. */
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+ unsigned int flags = reloc_result->flags;
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+
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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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+
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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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+
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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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+
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+ afct = afct->next;
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+ }
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+
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+ *value = DL_FIXUP_ADDR_VALUE (sym.st_value);
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+}
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diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
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index d4840a7c17441126..b46f7d7376e65361 100644
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--- a/elf/dl-runtime.c
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+++ b/elf/dl-runtime.c
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@@ -319,78 +319,7 @@ _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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-
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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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-
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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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-
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- /* Keep track of overwritten addresses. */
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- unsigned int flags = reloc_result->flags;
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-
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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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-
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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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-
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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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-
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- afct = afct->next;
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- }
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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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diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
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index 03676b474c3d37a3..47a9dee5b1c0ca63 100644
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--- a/sysdeps/generic/ldsodefs.h
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+++ b/sysdeps/generic/ldsodefs.h
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@@ -1307,6 +1307,10 @@ 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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__END_DECLS
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