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* [glibc/codonell/ld-audit] elf: Add _dl_audit_objsearch
@ 2022-03-29 21:03 Carlos O'Donell
0 siblings, 0 replies; only message in thread
From: Carlos O'Donell @ 2022-03-29 21:03 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2e1f6346b6888063414f884b46952632cfdb2a51
commit 2e1f6346b6888063414f884b46952632cfdb2a51
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue Jul 20 13:47:36 2021 -0300
elf: Add _dl_audit_objsearch
It consolidates the code required to call la_objsearch 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 c91008d3490e4e3ce29520068405f081f0d368ca)
Diff:
---
elf/dl-audit.c | 22 +++++++++++++++
elf/dl-load.c | 67 +++++++++++++---------------------------------
sysdeps/generic/ldsodefs.h | 7 +++++
3 files changed, 47 insertions(+), 49 deletions(-)
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index 74b87f4b39..5682427220 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -44,6 +44,28 @@ _dl_audit_activity_nsid (Lmid_t nsid, int action)
_dl_audit_activity_map (head, action);
}
+const char *
+_dl_audit_objsearch (const char *name, struct link_map *l, unsigned int code)
+{
+ if (l == NULL || l->l_auditing || code == 0)
+ return name;
+
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ if (afct->objsearch != NULL)
+ {
+ struct auditstate *state = link_map_audit_state (l, cnt);
+ name = afct->objsearch (name, &state->cookie, code);
+ if (name == NULL)
+ return NULL;
+ }
+ afct = afct->next;
+ }
+
+ return name;
+}
+
void
_dl_audit_objopen (struct link_map *l, Lmid_t nsid)
{
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 65f85b0acc..328ffe6ee8 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1596,32 +1596,20 @@ open_verify (const char *name, int fd,
#ifdef SHARED
/* Give the auditing libraries a chance. */
- if (__glibc_unlikely (GLRO(dl_naudit) > 0) && whatcode != 0
- && loader->l_auditing == 0)
+ if (__glibc_unlikely (GLRO(dl_naudit) > 0))
{
const char *original_name = name;
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
- {
- if (afct->objsearch != NULL)
- {
- struct auditstate *state = link_map_audit_state (loader, cnt);
- name = afct->objsearch (name, &state->cookie, whatcode);
- if (name == NULL)
- /* Ignore the path. */
- return -1;
- }
-
- afct = afct->next;
- }
+ name = _dl_audit_objsearch (name, loader, whatcode);
+ if (name == NULL)
+ return -1;
if (fd != -1 && name != original_name && strcmp (name, original_name))
- {
- /* An audit library changed what we're supposed to open,
- so FD no longer matches it. */
- __close_nocancel (fd);
- fd = -1;
- }
+ {
+ /* An audit library changed what we're supposed to open,
+ so FD no longer matches it. */
+ __close_nocancel (fd);
+ fd = -1;
+ }
}
#endif
@@ -2060,36 +2048,17 @@ _dl_map_object (struct link_map *loader, const char *name,
#ifdef SHARED
/* Give the auditing libraries a chance to change the name before we
try anything. */
- if (__glibc_unlikely (GLRO(dl_naudit) > 0)
- && (loader == NULL || loader->l_auditing == 0))
+ if (__glibc_unlikely (GLRO(dl_naudit) > 0))
{
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ const char *before = name;
+ name = _dl_audit_objsearch (name, loader, LA_SER_ORIG);
+ if (name == NULL)
{
- if (afct->objsearch != NULL)
- {
- const char *before = name;
- struct auditstate *state = link_map_audit_state (loader, cnt);
- name = afct->objsearch (name, &state->cookie, LA_SER_ORIG);
- if (name == NULL)
- {
- /* Do not try anything further. */
- fd = -1;
- goto no_file;
- }
- if (before != name && strcmp (before, name) != 0)
- {
- if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
- _dl_debug_printf ("audit changed filename %s -> %s\n",
- before, name);
-
- if (origname == NULL)
- origname = before;
- }
- }
-
- afct = afct->next;
+ fd = -1;
+ goto no_file;
}
+ if (before != name && strcmp (before, name) != 0)
+ origname = before;
}
#endif
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 3ae287cb72..9c3e92b9df 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1361,6 +1361,13 @@ link_map_audit_state (struct link_map *l, size_t index)
}
}
+/* Call the la_objsearch from the audit modules from the link map L. If
+ ORIGNAME is non NULL, it is updated with the revious name prior calling
+ la_objsearch. */
+const char *_dl_audit_objsearch (const char *name, struct link_map *l,
+ unsigned int code)
+ attribute_hidden;
+
/* Call the la_activity from the audit modules from the link map L and issues
the ACTION argument. */
void _dl_audit_activity_map (struct link_map *l, int action)
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