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>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <4df13c722729547622@agluck-desktop.sc.intel.com>
Date:	Thu, 09 Jun 2011 14:34:42 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>, "Borislav Petkov" <bp@...64.org>
Cc:	linux-kernel@...r.kernel.org, "Huang, Ying" <ying.huang@...el.com>,
	"Hidetoshi Seto" <seto.hidetoshi@...fujitsu.com>,
	"Avi Kivity" <avi@...hat.com>
Subject: [PATCH 06/10] HWPOISON: Handle hwpoison in current process

From: Andi Kleen <andi@...stfloor.org>

When hardware poison handles the current process use
a forced signal with _AR severity.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 mm/memory-failure.c |   28 ++++++++++++++++------------
 1 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2b9a5ee..a203113 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -184,8 +184,7 @@ int hwpoison_filter(struct page *p)
 EXPORT_SYMBOL_GPL(hwpoison_filter);
 
 /*
- * Send all the processes who have the page mapped an ``action optional''
- * signal.
+ * Send all the processes who have the page mapped a SIGBUS.
  */
 static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
 			unsigned long pfn, struct page *page)
@@ -194,23 +193,28 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
 	int ret;
 
 	printk(KERN_ERR
-		"MCE %#lx: Killing %s:%d early due to hardware memory corruption\n",
-		pfn, t->comm, t->pid);
+		"MCE %#lx: Killing %s:%d due to hardware memory corruption\n",
+	       pfn, t->comm, t->pid);
 	si.si_signo = SIGBUS;
 	si.si_errno = 0;
-	si.si_code = BUS_MCEERR_AO;
 	si.si_addr = (void *)addr;
 #ifdef __ARCH_SI_TRAPNO
 	si.si_trapno = trapno;
 #endif
 	si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT;
-	/*
-	 * Don't use force here, it's convenient if the signal
-	 * can be temporarily blocked.
-	 * This could cause a loop when the user sets SIGBUS
-	 * to SIG_IGN, but hopefully no one will do that?
-	 */
-	ret = send_sig_info(SIGBUS, &si, t);  /* synchronous? */
+	if (t == current) {
+		si.si_code = BUS_MCEERR_AR;
+		ret = force_sig_info(SIGBUS, &si, t);
+	} else {
+		/*
+		 * Don't use force here, it's convenient if the signal
+		 * can be temporarily blocked.
+		 * This could cause a loop when the user sets SIGBUS
+		 * to SIG_IGN, but hopefully noone will do that?
+		 */
+		si.si_code = BUS_MCEERR_AO;
+		ret = send_sig_info(SIGBUS, &si, t);
+	}
 	if (ret < 0)
 		printk(KERN_INFO "MCE: Error sending signal to %s:%d: %d\n",
 		       t->comm, t->pid, ret);
-- 
1.7.3.1

--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ