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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2021-11-03 11:20:50 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2021-11-09 14:11:25 -0300
commitb05fae4d8e34604a72ee36d2d3164391b76fcf0b (patch)
treea66b3f943d6b70b27326261fcb60063378e4c67f /sysdeps
parentdb6c4935fae6005d46af413b32aa92f4f6059dce (diff)
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elf: Use the minimal malloc on tunables_strdup
The rtld_malloc functions are moved to its own file so it can be used on csu code. Also, the functiosn are renamed to __minimal_* (since there are now used not only on loader code). Using the __minimal_malloc on tunables_strdup() avoids potential issues with sbrk() calls while processing the tunables (I see sporadic elf/tst-dso-ordering9 on powerpc64le with different tests failing due ASLR). Also, using __minimal_malloc over plain mmap optimizes the memory allocation on both static and dynamic case (since it will any unused space in either the last page of data segments, avoiding mmap() call, or from the previous mmap() call). Checked on x86_64-linux-gnu, i686-linux-gnu, and powerpc64le-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/dl-minimal-malloc.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/sysdeps/generic/dl-minimal-malloc.h b/sysdeps/generic/dl-minimal-malloc.h
new file mode 100644
index 0000000..7f50e52
--- /dev/null
+++ b/sysdeps/generic/dl-minimal-malloc.h
@@ -0,0 +1,28 @@
+/* Minimal malloc implementation for dynamic linker and static
+ initialization.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _DL_MINIMAL_MALLOC_H
+#define _DL_MINIMAL_MALLOC_H
+
+extern void *__minimal_malloc (size_t n) attribute_hidden;
+extern void *__minimal_calloc (size_t nmemb, size_t size) attribute_hidden;
+extern void __minimal_free (void *ptr) attribute_hidden;
+extern void *__minimal_realloc (void *ptr, size_t n) attribute_hidden;
+
+#endif