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Date: Mon, 12 May 2014 02:32:30 +0200 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Mathias Krause <minipli@...glemail.com>, "David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu> Subject: [ 030/143] proc connector: fix info leaks 2.6.32-longterm review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause <minipli@...glemail.com> [ Upstream commit e727ca82e0e9616ab4844301e6bae60ca7327682 ] Initialize event_data for all possible message types to prevent leaking kernel stack contents to userland (up to 20 bytes). Also set the flags member of the connector message to 0 to prevent leaking two more stack bytes this way. Cc: stable@...r.kernel.org Signed-off-by: Mathias Krause <minipli@...glemail.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Willy Tarreau <w@....eu> --- drivers/connector/cn_proc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c index 6069790..3a2587a 100644 --- a/drivers/connector/cn_proc.c +++ b/drivers/connector/cn_proc.c @@ -59,6 +59,7 @@ void proc_fork_connector(struct task_struct *task) msg = (struct cn_msg*)buffer; ev = (struct proc_event*)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); get_seq(&msg->seq, &ev->cpu); ktime_get_ts(&ts); /* get high res monotonic timestamp */ put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); @@ -71,6 +72,7 @@ void proc_fork_connector(struct task_struct *task) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = 0; /* not used */ msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ /* If cn_netlink_send() failed, the data is not sent */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -87,6 +89,7 @@ void proc_exec_connector(struct task_struct *task) msg = (struct cn_msg*)buffer; ev = (struct proc_event*)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); get_seq(&msg->seq, &ev->cpu); ktime_get_ts(&ts); /* get high res monotonic timestamp */ put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); @@ -97,6 +100,7 @@ void proc_exec_connector(struct task_struct *task) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = 0; /* not used */ msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -113,6 +117,7 @@ void proc_id_connector(struct task_struct *task, int which_id) msg = (struct cn_msg*)buffer; ev = (struct proc_event*)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); ev->what = which_id; ev->event_data.id.process_pid = task->pid; ev->event_data.id.process_tgid = task->tgid; @@ -136,6 +141,7 @@ void proc_id_connector(struct task_struct *task, int which_id) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = 0; /* not used */ msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -151,6 +157,7 @@ void proc_sid_connector(struct task_struct *task) msg = (struct cn_msg *)buffer; ev = (struct proc_event *)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); get_seq(&msg->seq, &ev->cpu); ktime_get_ts(&ts); /* get high res monotonic timestamp */ put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); @@ -161,6 +168,7 @@ void proc_sid_connector(struct task_struct *task) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = 0; /* not used */ msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -176,8 +184,10 @@ void proc_exit_connector(struct task_struct *task) msg = (struct cn_msg*)buffer; ev = (struct proc_event*)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); get_seq(&msg->seq, &ev->cpu); ktime_get_ts(&ts); /* get high res monotonic timestamp */ + memset(&ev->event_data, 0, sizeof(ev->event_data)); put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); ev->what = PROC_EVENT_EXIT; ev->event_data.exit.process_pid = task->pid; @@ -188,6 +198,7 @@ void proc_exit_connector(struct task_struct *task) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = 0; /* not used */ msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -211,6 +222,7 @@ static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) msg = (struct cn_msg*)buffer; ev = (struct proc_event*)msg->data; + memset(&ev->event_data, 0, sizeof(ev->event_data)); msg->seq = rcvd_seq; ktime_get_ts(&ts); /* get high res monotonic timestamp */ put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); @@ -220,6 +232,7 @@ static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); msg->ack = rcvd_ack + 1; msg->len = sizeof(*ev); + msg->flags = 0; /* not used */ cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); } @@ -249,6 +262,7 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg, break; } cn_proc_ack(err, msg->seq, msg->ack); + msg->flags = 0; /* not used */ } /* @@ -269,3 +283,5 @@ static int __init cn_proc_init(void) } module_init(cn_proc_init); + memset(&ev->event_data, 0, sizeof(ev->event_data)); + msg->flags = 0; /* not used */ -- 1.7.12.2.21.g234cd45.dirty -- 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/
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