From 56fa3ed34941b2451701c217ad5e0f7ac659ed48 Mon Sep 17 00:00:00 2001
From: nicholastao <taoyuxiang2@huawei.com>
Date: Tue, 25 Mar 2025 15:13:02 +0800
Subject: [PATCH] test random patch

---
 glibc.spec   |  3 ++-
 random.patch | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 random.patch

diff --git a/glibc.spec b/glibc.spec
index eb3c193..5ebcb3d 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -71,7 +71,7 @@
 ##############################################################################
 Name: 	 	glibc
 Version: 	2.34
-Release: 	166
+Release: 	167
 Summary: 	The GNU libc libraries
 License:	%{all_license}
 URL: 		http://www.gnu.org/software/glibc/
@@ -318,6 +318,7 @@ Patch226: backport-elf-Introduce-_dl_relocate_object_no_relro.patch
 Patch227: backport-elf-Switch-to-main-malloc-after-final-ld.so-self-rel.patch
 Patch228: AArch64-Optimize-memcmp.patch
 Patch229: backport-CVE-2025-0395-underallocation-of-abort_msg_s-struct.patch
+Patch229: random.patch
 
 Patch9000: turn-default-value-of-x86_rep_stosb_threshold_form_2K_to_1M.patch
 Patch9001: delete-no-hard-link-to-avoid-all_language-package-to.patch 
diff --git a/random.patch b/random.patch
new file mode 100644
index 0000000..b8bb47f
--- /dev/null
+++ b/random.patch
@@ -0,0 +1,47 @@
+diff --git a/stdlib/rand.c b/stdlib/rand.c
+index c250c065e4..f199dbd65f 100644
+--- a/stdlib/rand.c
++++ b/stdlib/rand.c
+@@ -19,10 +19,42 @@ 
+ 
+ #undef	rand
+ 
++#ifdef __aarch64__
++// A global variable to indicate whether rndr instruction is supported
++static int rndr_supported = 0;
++// A function prototype to check rndr support
++static void check_rndr_support (void) __attribute__ ((constructor));
++#endif
+ 
+ /* Return a random integer between 0 and RAND_MAX.  */
+ int
+ rand (void)
+ {
++  // Use armv8.5 rndr instruction if supported
++#ifdef __aarch64__
++  if (rndr_supported) {
++    unsigned int r;
++    asm volatile("mrs %0, s3_3_c2_c4_0" : "=r" (r));
++    // Discard the least random bit
++    r >>=1;
++    return (int) r;
++  }
++#endif
+   return (int) __random ();
+ }
++
++#ifdef __aarch64__
++// A function to check rndr support and set the global variable accordingly
++static void
++check_rndr_support (void)
++{
++  unsigned long isar0;
++  // Read the ID_AA64ISAR0_EL1 register to check the rndr feature
++  asm volatile("mrs %0, id_aa64isar0_el1" : "=r" (isar0));
++  // Check the bits [63:60] for the rndr feature
++  if ((isar0 >> 60) & 0xf) {
++    // Set the global variable to indicate rndr support
++    rndr_supported = 1;
++  }
++}
+
-- 
Gitee