linux-kernel - [PATCH 3/7][v7] Add from_ancestor_ns parameter to send

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: <20090117203552.GD11825@us.ibm.com>
Date:	Sat, 17 Jan 2009 12:35:52 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	oleg@...hat.com, ebiederm@...ssion.com, roland@...hat.com,
	bastian@...di.eu.org
Cc:	daniel@...ac.com, xemul@...nvz.org, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7][v7] Add from_ancestor_ns parameter to send_signal()


From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Date: Tue, 6 Jan 2009 17:28:05 -0800
Subject: [PATCH 3/7][v7] Add from_ancestor_ns parameter to send_signal()

send_signal() (or its helper) needs to determine the pid namespace
of the sender. But a signal sent via kill_pid_info_as_uid() comes
from within the kernel and send_signal() does not need to determine
the pid namespace of the sender. So define a helper for send_signal()
which takes an additional parameter, 'from_ancestor_ns' and have
kill_pid_info_as_uid() use that helper directly.

The 'from_ancestor_ns' parameter will be used in a follow-on patch.

Changelog[v6]:
	- New patch added to this patchset, based on suggestions from
	  Roland McGrath and Oleg Nesterov.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
 kernel/signal.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 87f3f30..bb3b6f5 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -821,8 +821,8 @@ static inline int legacy_queue(struct sigpending *signals, int sig)
 	return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
 }
 
-static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
-			int group)
+static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
+			int group, int from_ancestor_ns)
 {
 	struct sigpending *pending;
 	struct sigqueue *q;
@@ -896,6 +896,12 @@ out_set:
 	return 0;
 }
 
+static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
+			int group)
+{
+	return __send_signal(sig, info, t, group, 0);
+}
+
 int print_fatal_signals;
 
 static void print_fatal_signal(struct pt_regs *regs, int signr)
@@ -1138,7 +1144,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
 	if (sig && p->sighand) {
 		unsigned long flags;
 		spin_lock_irqsave(&p->sighand->siglock, flags);
-		ret = __group_send_sig_info(sig, info, p);
+		ret = __send_signal(sig, info, p, 1, 0);
 		spin_unlock_irqrestore(&p->sighand->siglock, flags);
 	}
 out_unlock:
-- 
1.5.2.5

--
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/