linux-kernel - [PATCH] pci_get_device call from interrupt in reboot fixups

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]

Message-ID: <20070807090447.GA14294@iris.sw.ru>
Date:	Tue, 7 Aug 2007 13:04:47 +0400
From:	"Denis V. Lunev" <den@...nvz.org>
To:	den@...nvz.org, dev@...nvz.org, akpm@...ux-foundation.org,
	gregkh@...e.de
Cc:	devel@...nvz.org, linux-kernel@...r.kernel.org, xemul@...nvz.org
Subject: [PATCH] pci_get_device call from interrupt in reboot fixups

The following calltrace is possible now:
 handle_sysrq
   machine_emergency_restart
     mach_reboot_fixups
       pci_get_device
         pci_get_subsys
	   down_read
The patch skips reboot fixup if called from sysrq-B code.
---

--- ./arch/i386/kernel/reboot_fixups.c.fixup2	2007-08-07 12:30:30.000000000 +0400
+++ ./arch/i386/kernel/reboot_fixups.c	2007-08-07 12:31:22.000000000 +0400
@@ -11,6 +11,7 @@
 #include <asm/delay.h>
 #include <linux/pci.h>
 #include <linux/reboot_fixups.h>
+#include <linux/interrupt.h>
 
 static void cs5530a_warm_reset(struct pci_dev *dev)
 {
@@ -43,6 +44,11 @@ void mach_reboot_fixups(void)
 	struct pci_dev *dev;
 	int i;
 
+	/* we can be called from sysrq-B code. In such a case it is
+	 * prohibited to dig PCI */
+	if (in_interrupt())
+		return;
+
 	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
 		cur = &(fixups_table[i]);
 		dev = pci_get_device(cur->vendor, cur->device, NULL);
-
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/