linux-kernel - [PATCH] i386 regparm=3 RT signal handlers on x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Sun, 29 Oct 2006 22:26:17 -0500
From:	Albert Cahalan <acahalan@...il.com>
To:	Albert Cahalan <acahalan@...il.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	Andi Kleen <ak@...e.de>
Cc:	Albert Cahalan <acahalan@...il.com>
Subject: [PATCH] i386 regparm=3 RT signal handlers on x86_64

The recent change to make x86_64 support i386 binaries compiled
with -mregparm=3 only covered signal handlers without SA_SIGINFO.
(the 3-arg "real-time" ones) This is useful for klibc at least.

Signed-off-by: Albert Cahalan <acahalan@...il.com>

diff -Naurd old/arch/x86_64/ia32/ia32_signal.c new/arch/x86_64/ia32/ia32_signal.c
--- old/arch/x86_64/ia32/ia32_signal.c	2006-10-29 20:36:01.000000000 -0500
+++ new/arch/x86_64/ia32/ia32_signal.c	2006-10-29 21:58:01.000000000 -0500
@@ -579,6 +579,11 @@
 	regs->rsp = (unsigned long) frame;
 	regs->rip = (unsigned long) ka->sa.sa_handler;
 
+	/* Make -mregparm=3 work */
+	regs->rax = sig;
+	regs->rdx = (unsigned long) &frame->info;
+	regs->rcx = (unsigned long) &frame->uc;
+
 	asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); 
 	asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); 
 	
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/