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Date: Mon, 20 Jul 2015 22:46:23 +0300
From: Vadim Kochan <vadim4j@...il.com>
To: netdev@...r.kernel.org
Cc: Vadim Kochan <vadim4j@...il.com>
Subject: [PATCH iproute2] ss: Fix crash when dump stats from /proc with '-p'
From: Vadim Kochan <vadim4j@...il.com>
It really partially reverts:
ec4d0d8a9def35 (ss: Replace unixstat struct by new sockstat struct)
but adds few fields (name & peer_name) from removed unixstat to sockstat struct to easy
return original code.
Fixes: ec4d0d8a9def35 (ss: Replace unixstat struct by new sockstat struct)
Reported-by: Marc Dietrich <marvin24@....de>
Signed-off-by: Vadim Kochan <vadim4j@...il.com>
---
misc/ss.c | 73 ++++++++++++++++++++++++++++-----------------------------------
1 file changed, 32 insertions(+), 41 deletions(-)
diff --git a/misc/ss.c b/misc/ss.c
index 03f92fa..ed7960f 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -676,18 +676,6 @@ static int get_slabstat(struct slabstat *s)
return 0;
}
-static inline void sock_addr_set_str(inet_prefix *prefix, char **ptr)
-{
- memcpy(prefix->data, ptr, sizeof(char *));
-}
-
-static inline char *sock_addr_get_str(const inet_prefix *prefix)
-{
- char *tmp ;
- memcpy(&tmp, prefix->data, sizeof(char *));
- return tmp;
-}
-
static unsigned long long cookie_sk_get(const uint32_t *cookie)
{
return (((unsigned long long)cookie[1] << 31) << 1) | cookie[0];
@@ -739,6 +727,8 @@ struct sockstat
int refcnt;
unsigned int iface;
unsigned long long sk;
+ char *name;
+ char *peer_name;
};
struct dctcpstat
@@ -1063,9 +1053,9 @@ static int inet2_addr_match(const inet_prefix *a, const inet_prefix *p,
static int unix_match(const inet_prefix *a, const inet_prefix *p)
{
- char *addr = sock_addr_get_str(a);
- char *pattern = sock_addr_get_str(p);
-
+ char *addr, *pattern;
+ memcpy(&addr, a->data, sizeof(addr));
+ memcpy(&pattern, p->data, sizeof(pattern));
if (pattern == NULL)
return 1;
if (addr == NULL)
@@ -1081,7 +1071,8 @@ static int run_ssfilter(struct ssfilter *f, struct sockstat *s)
static int low, high=65535;
if (s->local.family == AF_UNIX) {
- char *p = sock_addr_get_str(&s->local);
+ char *p;
+ memcpy(&p, s->local.data, sizeof(p));
return p == NULL || (p[0] == '@' && strlen(p) == 6 &&
strspn(p+1, "0123456789abcdef") == 5);
}
@@ -1401,7 +1392,7 @@ void *parse_hostcond(char *addr, bool is_port)
addr+=5;
p = strdup(addr);
a.addr.bitlen = 8*strlen(p);
- sock_addr_set_str(&a.addr, &p);
+ memcpy(a.addr.data, &p, sizeof(p));
fam = AF_UNIX;
goto out;
}
@@ -2508,12 +2499,9 @@ static void unix_list_free(struct sockstat *list)
{
while (list) {
struct sockstat *s = list;
- char *name = sock_addr_get_str(&s->local);
-
list = list->next;
-
- if (name)
- free(name);
+ if (s->name)
+ free(s->name);
free(s);
}
}
@@ -2556,7 +2544,7 @@ static bool unix_use_proc(void)
static void unix_stats_print(struct sockstat *list, struct filter *f)
{
struct sockstat *s;
- char *local, *peer;
+ char *peer;
char *ctx_buf = NULL;
bool use_proc = unix_use_proc();
char port_name[30] = {};
@@ -2567,8 +2555,9 @@ static void unix_stats_print(struct sockstat *list, struct filter *f)
if (unix_type_skip(s, f))
continue;
- local = sock_addr_get_str(&s->local);
- peer = "*";
+ peer = "*";
+ if (s->peer_name)
+ peer = s->peer_name;
if (s->rport && use_proc) {
struct sockstat *p;
@@ -2581,24 +2570,26 @@ static void unix_stats_print(struct sockstat *list, struct filter *f)
if (!p) {
peer = "?";
} else {
- peer = sock_addr_get_str(&p->local);
- peer = peer ? : "*";
+ peer = p->name ? : "*";
}
}
if (use_proc && f->f) {
+ struct sockstat st;
+ st.local.family = AF_UNIX;
+ st.remote.family = AF_UNIX;
+ memcpy(st.local.data, &s->name, sizeof(s->name));
if (strcmp(peer, "*") == 0)
- memset(s->remote.data, 0, sizeof(char *));
+ memset(st.remote.data, 0, sizeof(peer));
else
- sock_addr_set_str(&s->remote, &peer);
-
- if (run_ssfilter(f->f, s) == 0)
+ memcpy(st.remote.data, &peer, sizeof(peer));
+ if (run_ssfilter(f->f, &st) == 0)
continue;
}
sock_state_print(s, unix_netid_name(s->type));
- sock_addr_print(local ?: "*", " ",
+ sock_addr_print(s->name ?: "*", " ",
int_to_str(s->lport, port_name), NULL);
sock_addr_print(peer, " ", int_to_str(s->rport, port_name),
NULL);
@@ -2626,8 +2617,8 @@ static int unix_show_sock(const struct sockaddr_nl *addr, struct nlmsghdr *nlh,
struct filter *f = (struct filter *)arg;
struct unix_diag_msg *r = NLMSG_DATA(nlh);
struct rtattr *tb[UNIX_DIAG_MAX+1];
- char *name = NULL;
- struct sockstat stat = {};
+ char name[128];
+ struct sockstat stat = { .name = "*", .peer_name = "*" };
parse_rtattr(tb, UNIX_DIAG_MAX, (struct rtattr*)(r+1),
nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
@@ -2648,12 +2639,12 @@ static int unix_show_sock(const struct sockaddr_nl *addr, struct nlmsghdr *nlh,
if (tb[UNIX_DIAG_NAME]) {
int len = RTA_PAYLOAD(tb[UNIX_DIAG_NAME]);
- name = malloc(len + 1);
memcpy(name, RTA_DATA(tb[UNIX_DIAG_NAME]), len);
name[len] = '\0';
if (name[0] == '\0')
name[0] = '@';
- sock_addr_set_str(&stat.local, &name);
+ stat.name = &name[0];
+ memcpy(stat.local.data, &stat.name, sizeof(stat.name));
}
if (tb[UNIX_DIAG_PEER])
stat.rport = rta_getattr_u32(tb[UNIX_DIAG_PEER]);
@@ -2676,9 +2667,6 @@ static int unix_show_sock(const struct sockaddr_nl *addr, struct nlmsghdr *nlh,
}
if (show_mem || show_details)
printf("\n");
-
- if (name)
- free(name);
return 0;
}
@@ -2747,6 +2735,8 @@ static int unix_show(struct filter *f)
if (!(u = malloc(sizeof(*u))))
break;
+ u->name = NULL;
+ u->peer_name = NULL;
if (sscanf(buf, "%x: %x %x %x %x %x %d %s",
&u->rport, &u->rq, &u->wq, &flags, &u->type,
@@ -2782,8 +2772,9 @@ static int unix_show(struct filter *f)
*insp = u;
if (name[0]) {
- char *tmp = strdup(name);
- sock_addr_set_str(&u->local, &tmp);
+ if ((u->name = malloc(strlen(name)+1)) == NULL)
+ break;
+ strcpy(u->name, name);
}
if (++cnt > MAX_UNIX_REMEMBER) {
unix_stats_print(list, f);
--
2.4.2
--
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