From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from e23smtp09.au.ibm.com ([202.81.31.142]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WIuWF-0001za-DM for kexec@lists.infradead.org; Thu, 27 Feb 2014 06:32:39 +0000 Received: from /spool/local by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 27 Feb 2014 16:31:39 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id EDD562CE8046 for ; Thu, 27 Feb 2014 17:31:35 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s1R6BeYh50200826 for ; Thu, 27 Feb 2014 17:11:41 +1100 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s1R6VZ0O007809 for ; Thu, 27 Feb 2014 17:31:35 +1100 Subject: [PATCH 05/10] Scrub data in tcp socket buffers From: Aruna Balakrishnaiah Date: Thu, 27 Feb 2014 12:01:27 +0530 Message-ID: <20140227063127.5924.32068.stgit@aruna-ThinkPad-T420> In-Reply-To: <20140227063007.5924.5819.stgit@aruna-ThinkPad-T420> References: <20140227063007.5924.5819.stgit@aruna-ThinkPad-T420> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: kexec@lists.infradead.org Cc: kumagai-atsushi@mxc.nes.nec.co.jp Find tcp domain sockets (struct sock *sk) tcp sockets: Iterate from 0 to INET_LHTABLE_SIZE and get inet_list_hashbucket from tcp_hash_info.listening_hash[] for (i = 0; i < INET_LHTABLE_SIZE; i++) { struct inet_listen_hashbucket *ilb = &tcp_hashinfo.listening_hash[i]; } for (i = 0; i < INET_LHTABLE_SIZE; i++) { struct inet_listen_hashbucket *ilb = &tcp_hashinfo.listening_hash[i]; } For each hash bucket iterate over ilb->head null list to get sockets: struct sock *sk; sk_nulls_for_each(sk, node, &ilb->head) { ... } For each socket iterate over the socket buffers in sk_receive_queue and sk_write_queue: struct sock { ... struct sk_buff_head sk_receive_queue; ... struct sk_buff_head sk_write_queue; ... }; struct sk_buff_head { struct sk_buff *next; struct sk_buff *prev; }; For each struct sk_buff in the two lists clear the memory referenced by skb->data / skb->data_len: struct sk_buff { ... unsigned int data_len; ... unsigned char *data; ... }; Signed-off-by: Aruna Balakrishnaiah --- eppic_scripts/tcp_sk_buf.c | 78 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 eppic_scripts/tcp_sk_buf.c diff --git a/eppic_scripts/tcp_sk_buf.c b/eppic_scripts/tcp_sk_buf.c new file mode 100644 index 0000000..4c3efc3 --- /dev/null +++ b/eppic_scripts/tcp_sk_buf.c @@ -0,0 +1,78 @@ +string +tcp_opt() +{ + return "l"; +} + +string +tcp_usage() +{ + return "\n"; +} + +static void +tcp_showusage() +{ + printf("usage : tcp %s", tcp_non_legacy_usage()); +} + +string +tcp_help() +{ + return "Help"; +} + +int +tcp() +{ + int i; + struct inet_hashinfo *tab; + struct sock_common *off = 0; + + tab = &tcp_hashinfo; + + for (i = 0; i < 32; i++) { + struct hlist_nulls_node *pos; + + pos = tab->listening_hash[i].head.first; + + while (!((unsigned long)pos & 1)) { + struct sock *sk; + struct sk_buff *next; + struct sk_buff_head *head; + struct hlist_nulls_node *node; + + sk = (struct sock *)((unsigned long)pos - (unsigned long)&(off->skc_dontcopy_begin)); + + head = (struct sk_buff_head *)&(sk->sk_receive_queue); + next = (struct sk_buff *)sk->sk_receive_queue.next; + + while (next != head) + { + struct sk_buff *buff = (struct sk_buff *) next; + + memset((char *)buff->data, 'L', buff->data_len); + memset((char *)&(buff->data_len), 'L', 0x4); + + next = buff->next; + } + + head = (struct sk_buff_head *)&(sk->sk_write_queue); + next = (struct sk_buff *)sk->sk_write_queue.next; + + while (next != head) + { + struct sk_buff *buff = (struct sk_buff *) next; + + memset((char *)buff->data, 'L', buff->data_len); + memset((char *)&(buff->data_len), 'L', 0x4); + + next = buff->next; + } + + node = (struct hlist_nulls_node *)((unsigned long)sk + (unsigned long)&(off->skc_dontcopy_begin)); + pos = node->next; + } + } + return 1; +} _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec