glibc/SOURCES/glibc-rh1817513-89.patch

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2021-04-23 04:11:25 +00:00
commit 72d36ffd7db55ae599f4c77feb0eae25a0f3714e
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Oct 8 10:57:09 2020 +0200
elf: Implement __rtld_malloc_is_complete
In some cases, it is difficult to determine the kind of malloc
based on the execution context, so a function to determine that
is helpful.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index 4335f1bd24289b01..cf7df8a8d5eabe9d 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -59,6 +59,14 @@ __rtld_malloc_init_stubs (void)
__rtld_realloc = &rtld_realloc;
}
+bool
+__rtld_malloc_is_complete (void)
+{
+ /* The caller assumes that there is an active malloc. */
+ assert (__rtld_malloc != NULL);
+ return __rtld_malloc != &rtld_malloc;
+}
+
/* Lookup NAME at VERSION in the scope of MATCH. */
static void *
lookup_malloc_symbol (struct link_map *main_map, const char *name,
diff --git a/include/rtld-malloc.h b/include/rtld-malloc.h
index b026a3270cd24819..9266ec532f3f3376 100644
--- a/include/rtld-malloc.h
+++ b/include/rtld-malloc.h
@@ -66,6 +66,10 @@ realloc (void *ptr, size_t size)
implementation. */
void __rtld_malloc_init_stubs (void) attribute_hidden;
+/* Return false if the active malloc is the ld.so minimal malloc, true
+ if it is the full implementation from libc.so. */
+_Bool __rtld_malloc_is_complete (void) attribute_hidden;
+
/* Called shortly before the final self-relocation (when RELRO
variables are still writable) to activate the real malloc
implementation. MAIN_MAP is the link map of the executable. */