audit: format user messages to size of MAX_AUDIT_MESSAGE_LENGTH
Messages of type AUDIT_USER_TTY were being formatted to 1024 octets, truncating messages approaching MAX_AUDIT_MESSAGE_LENGTH (8970 octets). Set the formatting to 8560 characters, given maximum estimates for prefix and suffix budgets. See the problem discussion: https://www.redhat.com/archives/linux-audit/2009-January/msg00030.html And the new size rationale: https://www.redhat.com/archives/linux-audit/2013-September/msg00016.html Test ~8k messages with: auditctl -m "$(for i in $(seq -w 001 820);do echo -n "${i}0______";done)" Reported-by: LC Bruzenak <lenny@magitekltd.com> Reported-by: Justin Stephenson <jstephen@redhat.com> Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com>
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@ -358,6 +358,12 @@ enum {
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#define AUDIT_PERM_READ 4
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#define AUDIT_PERM_ATTR 8
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/* MAX_AUDIT_MESSAGE_LENGTH is set in audit:lib/libaudit.h as:
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* 8970 // PATH_MAX*2+CONTEXT_SIZE*2+11+256+1
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* max header+body+tailer: 44 + 29 + 32 + 262 + 7 + pad
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*/
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#define AUDIT_MESSAGE_TEXT_MAX 8560
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struct audit_status {
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__u32 mask; /* Bit mask for valid entries */
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__u32 enabled; /* 1 = enabled, 0 = disabled */
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@ -715,7 +715,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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}
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audit_log_common_recv_msg(&ab, msg_type);
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if (msg_type != AUDIT_USER_TTY)
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audit_log_format(ab, " msg='%.1024s'",
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audit_log_format(ab, " msg='%.*s'",
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AUDIT_MESSAGE_TEXT_MAX,
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(char *)data);
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else {
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int size;
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