linux-kernel - [PATCH v4 06/18] tools/nolibc: crt.h: initialize stack protector

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Message-Id: <2d286a88c325ab7e445029be6ab99eb810003e62.1689444638.git.falcon@tinylab.org>
Date:   Sun, 16 Jul 2023 02:23:21 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     arnd@...db.de, falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, thomas@...ch.de,
        Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v4 06/18] tools/nolibc: crt.h: initialize stack protector

As suggested by Thomas, It is able to move the stackprotector
initialization from the assembly _start to the beginning of the new
_start_c(). Let's call __stack_chk_init() in _start_c() as a
preparation.

Suggested-by: Thomas Weißschuh <linux@...ssschuh.net>
Link: https://lore.kernel.org/lkml/a00284a6-54b1-498c-92aa-44997fa78403@t-8ch.de/
Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/include/nolibc/crt.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/include/nolibc/crt.h b/tools/include/nolibc/crt.h
index 92a2a0478cb1..32e128b0fb62 100644
--- a/tools/include/nolibc/crt.h
+++ b/tools/include/nolibc/crt.h
@@ -10,6 +10,7 @@
 char **environ __attribute__((weak));
 const unsigned long *_auxv __attribute__((weak));
 
+void __stack_chk_init(void);
 static void exit(int);
 
 void _start_c(long *sp)
@@ -21,6 +22,9 @@ void _start_c(long *sp)
 	/* silence potential warning: conflicting types for 'main' */
 	int _nolibc_main(int, char **, char **) __asm__ ("main");
 
+	/* initialize stack protector */
+	__stack_chk_init();
+
 	/*
 	 * sp  :    argc          <-- argument count, required by main()
 	 * argv:    argv[0]       <-- argument vector, required by main()
-- 
2.25.1