glibc/SOURCES/glibc-rh2119304-1.patch

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2022-09-27 20:17:01 +00:00
Downstream-only patch to move the recently added members (from
glibc-rh2047981-5.patch and glibc-rh2047981-6.patch) to the end
of _rtld_global_ro. This avoids changing the offset of
GLRO (dl_naudit).
Without this change, the audit invocation loop in the old
__libc_start_main function in a not-yet-updated version of libc.so.6
reads a non-zero garbage value for GLRO (dl_naudit), assumes that
auditing is active, and reads further garbage pointers, leading to
to a crash. Preserving the old offset of GLRO (dl_naudit) avoids
that. This works because RPM updates /lib64/ld-* before
/lib64/libc.so.6 because it sorts earlier (except on POWER9 due
to the glibc-hwcaps/power9 multilib).
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 9dec9e3d3b6d6aa2..5e56550a4d556fa7 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -648,6 +648,15 @@ struct rtld_global_ro
void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen,
Lmid_t nsid, int argc, char *argv[], char *env[]);
void (*_dl_close) (void *map);
+ void *(*_dl_tls_get_addr_soft) (struct link_map *);
+#ifdef HAVE_DL_DISCOVER_OSVERSION
+ int (*_dl_discover_osversion) (void);
+#endif
+
+ /* List of auditing interfaces. */
+ struct audit_ifaces *_dl_audit;
+ unsigned int _dl_naudit;
+
/* libdl in a secondary namespace (after dlopen) must use
_dl_catch_error from the main namespace, so it has to be
exported in some way. */
@@ -657,14 +666,6 @@ struct rtld_global_ro
/* libdl in a secondary namespace must use free from the base
namespace. */
void (*_dl_error_free) (void *);
- void *(*_dl_tls_get_addr_soft) (struct link_map *);
-#ifdef HAVE_DL_DISCOVER_OSVERSION
- int (*_dl_discover_osversion) (void);
-#endif
-
- /* List of auditing interfaces. */
- struct audit_ifaces *_dl_audit;
- unsigned int _dl_naudit;
};
# define __rtld_global_attribute__
# if IS_IN (rtld)