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Re: [PATCH] Fix a bug of "autrace -r /bin/ls" in i386



Hello Steve,

When execute "autrace -r /bin/ls" in i386, The error message
"Error inserting audit rule for pid=349" will be outputed.

After apply the patch,
When the target system is a i386 processor, autrace will not
trace socket system calls.

Signed-off-by: Peng Haitao <penght cn fujitsu com>
---
 src/autrace.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/autrace.c b/src/autrace.c
index e1ff695..ed7ae22 100755
--- a/src/autrace.c
+++ b/src/autrace.c
@@ -84,11 +84,16 @@ static int insert_rule(int audit_fd, const char *field)
 		rc |= audit_rule_syscallbyname_data(rule, "readlink");
 		rc |= audit_rule_syscallbyname_data(rule, "readlinkat");
 		rc |= audit_rule_syscallbyname_data(rule, "execve");
-		rc |= audit_rule_syscallbyname_data(rule, "connect");
-		rc |= audit_rule_syscallbyname_data(rule, "bind");
-		rc |= audit_rule_syscallbyname_data(rule, "accept");
-		rc |= audit_rule_syscallbyname_data(rule, "sendto");
-		rc |= audit_rule_syscallbyname_data(rule, "recvfrom");
+
+		int machine = audit_detect_machine();
+		if (machine != MACH_X86) {
+			rc |= audit_rule_syscallbyname_data(rule, "connect");
+			rc |= audit_rule_syscallbyname_data(rule, "bind");
+			rc |= audit_rule_syscallbyname_data(rule, "accept");
+			rc |= audit_rule_syscallbyname_data(rule, "sendto");
+			rc |= audit_rule_syscallbyname_data(rule, "recvfrom");
+		}
+
 		rc |= audit_rule_syscallbyname_data(rule, "sendfile");
 	} else
 		rc = audit_rule_syscallbyname_data(rule, "all");
-- 
1.7.0.1


Peng Haitao said the following on 2010-11-5 18:36:
> Hello Steve,
> 
> When execute "autrace -r /bin/ls" in i386, The error message
> "Error inserting audit rule for pid=349" will be outputed.
> 
> When execute "ausyscall i386 connect", The error message
> "Unknown syscall connect using i386 lookup table" will be outputed.
> 
> After apply the patch, 
> The output of "ausyscall i386 connect" is "socketcall         102".
> The output of "autrace -r /bin/ls" should be OK.
> 
> Signed-off-by: Peng Haitao <penght cn fujitsu com>
> ---
>  lib/lookup_table.c          |   36 ++++++++++++++++++++++++++++++++++++
>  tools/ausyscall/ausyscall.c |   36 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 72 insertions(+), 0 deletions(-)
> 
> diff --git a/lib/lookup_table.c b/lib/lookup_table.c
> index b0abe07..c6f892f 100755
> --- a/lib/lookup_table.c
> +++ b/lib/lookup_table.c
> @@ -29,6 +29,7 @@
>  #include <stdlib.h>
>  #include <ctype.h>
>  #include <errno.h>
> +#include <linux/net.h>
>  
>  #include "libaudit.h"
>  #include "gen_tables.h"
> @@ -96,6 +97,33 @@ const char *audit_field_to_name(int field)
>  	return field_i2s(field);
>  }
>  
> +/* This is the name/value pair used by search tables */
> +struct nv_pair {
> +	int        value;
> +	const char *name;
> +};
> +
> +static struct nv_pair socktab[] = {
> +	{SYS_SOCKET, "socket"},
> +	{SYS_BIND, "bind"},
> +	{SYS_CONNECT, "connect"},
> +	{SYS_LISTEN, "listen"},
> +	{SYS_ACCEPT, "accept"},
> +	{SYS_GETSOCKNAME, "getsockname"},
> +	{SYS_GETPEERNAME, "getpeername"},
> +	{SYS_SOCKETPAIR, "socketpair"},
> +	{SYS_SEND, "send"},
> +	{SYS_RECV, "recv"},
> +	{SYS_SENDTO, "sendto"},
> +	{SYS_RECVFROM, "recvfrom"},
> +	{SYS_SHUTDOWN, "shutdown"},
> +	{SYS_SETSOCKOPT, "setsockopt"},
> +	{SYS_GETSOCKOPT, "getsockopt"},
> +	{SYS_SENDMSG, "sendmsg"},
> +	{SYS_RECVMSG, "recvmsg"}
> +};
> +#define SOCK_NAMES (sizeof(socktab)/sizeof(socktab[0]))
> +
>  int audit_name_to_syscall(const char *sc, int machine)
>  {
>  	int res, found;
> @@ -104,6 +132,14 @@ int audit_name_to_syscall(const char *sc, int machine)
>  	{
>  		case MACH_X86:
>  			found = i386_syscall_s2i(sc, &res);
> +			if (!found) {
> +				int i;
> +				for(i = 0; i < SOCK_NAMES; i++)
> +					if (strcmp(socktab[i].name, sc) == 0) {
> +						sc = "socketcall";
> +						found = i386_syscall_s2i(sc, &res);
> +					}
> +			}
>  			break;
>  		case MACH_86_64:
>  			found = x86_64_syscall_s2i(sc, &res);
> diff --git a/tools/ausyscall/ausyscall.c b/tools/ausyscall/ausyscall.c
> index 565336f..772aa00 100755
> --- a/tools/ausyscall/ausyscall.c
> +++ b/tools/ausyscall/ausyscall.c
> @@ -25,10 +25,38 @@
>  #include <string.h>
>  #include <stdlib.h>
>  #include <ctype.h>
> +#include <linux/net.h>
>  #include "libaudit.h"
>  
>  #define LAST_SYSCALL 1400	// IA64 is in the 1300's right now
>  
> +/* This is the name/value pair used by search tables */
> +struct nv_pair {
> +	int        value;
> +	const char *name;
> +};
> +
> +static struct nv_pair socktab[] = {
> +	{SYS_SOCKET, "socket"},
> +	{SYS_BIND, "bind"},
> +	{SYS_CONNECT, "connect"},
> +	{SYS_LISTEN, "listen"},
> +	{SYS_ACCEPT, "accept"},
> +	{SYS_GETSOCKNAME, "getsockname"},
> +	{SYS_GETPEERNAME, "getpeername"},
> +	{SYS_SOCKETPAIR, "socketpair"},
> +	{SYS_SEND, "send"},
> +	{SYS_RECV, "recv"},
> +	{SYS_SENDTO, "sendto"},
> +	{SYS_RECVFROM, "recvfrom"},
> +	{SYS_SHUTDOWN, "shutdown"},
> +	{SYS_SETSOCKOPT, "setsockopt"},
> +	{SYS_GETSOCKOPT, "getsockopt"},
> +	{SYS_SENDMSG, "sendmsg"},
> +	{SYS_RECVMSG, "recvmsg"}
> +};
> +#define SOCK_NAMES (sizeof(socktab)/sizeof(socktab[0]))
> +
>  void usage(void)
>  {
>  	fprintf(stderr, "usage: ausyscall [arch] name | number | --dump | --exact\n");
> @@ -119,6 +147,14 @@ int main(int argc, char *argv[])
>  				if (n && strcasestr(n, name)) {
>  					found = 1;
>  					printf("%-18s %d\n", n, i);
> +				} else if (n && strcmp(n, "socketcall") == 0) {
> +					int j = 0;
> +					for (j = 0; j < SOCK_NAMES; j++)
> +						if (strcmp(socktab[j].name, name) == 0) {
> +							found = 1;
> +							printf("%-18s %d\n", n, i);
> +							break;
> +						}
>  				}
>  			}
>  			if (!found) {

-- 
Best Regards,
Peng Haitao
--------------------------------------------------
Peng Haitao
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
No.6 Wenzhu Road, Nanjing, 210012, China 
TEL: +86+25-86630566-8513
FUJITSU INTERNAL: 7998-8513
FAX: +86+25-83317685
EMail: penght cn fujitsu com
--------------------------------------------------
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