cregit-Linux how code gets into the kernel

Release 4.8 net/sunrpc/svcauth_unix.c

Directory: net/sunrpc
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/sunrpc/addr.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/hash.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <linux/kernel.h>
#include <linux/user_namespace.h>

#define RPCDBG_FACILITY	RPCDBG_AUTH


#include "netns.h"

/*
 * AUTHUNIX and AUTHNULL credentials are both handled here.
 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
 * are always nobody (-2).  i.e. we do the same IP address checks for
 * AUTHNULL as for AUTHUNIX, and that is done here.
 */



struct unix_domain {
	
struct auth_domain	h;
	/* other stuff later */
};

extern struct auth_ops svcauth_null;
extern struct auth_ops svcauth_unix;


static void svcauth_unix_domain_release(struct auth_domain *dom) { struct unix_domain *ud = container_of(dom, struct unix_domain, h); kfree(dom->name); kfree(ud); }

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j. bruce fieldsj. bruce fields38100.00%1100.00%
Total38100.00%1100.00%


struct auth_domain *unix_domain_find(char *name) { struct auth_domain *rv; struct unix_domain *new = NULL; rv = auth_domain_lookup(name, NULL); while(1) { if (rv) { if (new && rv != &new->h) svcauth_unix_domain_release(&new->h); if (rv->flavour != &svcauth_unix) { auth_domain_put(rv); return NULL; } return rv; } new = kmalloc(sizeof(*new), GFP_KERNEL); if (new == NULL) return NULL; kref_init(&new->h.ref); new->h.name = kstrdup(name, GFP_KERNEL); if (new->h.name == NULL) { kfree(new); return NULL; } new->h.flavour = &svcauth_unix; rv = auth_domain_lookup(name, &new->h); } }

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neil brownneil brown15590.64%450.00%
petri t. koistinenpetri t. koistinen95.26%112.50%
j. bruce fieldsj. bruce fields42.34%225.00%
paulo marquespaulo marques31.75%112.50%
Total171100.00%8100.00%

EXPORT_SYMBOL_GPL(unix_domain_find); /************************************************** * cache for IP address to unix_domain * as needed by AUTH_UNIX */ #define IP_HASHBITS 8 #define IP_HASHMAX (1<<IP_HASHBITS) struct ip_map { struct cache_head h; char m_class[8]; /* e.g. "nfsd" */ struct in6_addr m_addr; struct unix_domain *m_client; };
static void ip_map_put(struct kref *kref) { struct cache_head *item = container_of(kref, struct cache_head, ref); struct ip_map *im = container_of(item, struct ip_map,h); if (test_bit(CACHE_VALID, &item->flags) && !test_bit(CACHE_NEGATIVE, &item->flags)) auth_domain_put(&im->m_client->h); kfree(im); }

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neil brownneil brown7898.73%375.00%
adrian bunkadrian bunk11.27%125.00%
Total79100.00%4100.00%


static inline int hash_ip6(const struct in6_addr *ip) { return hash_32(ipv6_addr_hash(ip), IP_HASHBITS); }

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aurelien charbonaurelien charbon1875.00%150.00%
eric dumazeteric dumazet625.00%150.00%
Total24100.00%2100.00%


static int ip_map_match(struct cache_head *corig, struct cache_head *cnew) { struct ip_map *orig = container_of(corig, struct ip_map, h); struct ip_map *new = container_of(cnew, struct ip_map, h); return strcmp(orig->m_class, new->m_class) == 0 && ipv6_addr_equal(&orig->m_addr, &new->m_addr); }

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neil brownneil brown6791.78%375.00%
aurelien charbonaurelien charbon68.22%125.00%
Total73100.00%4100.00%


static void ip_map_init(struct cache_head *cnew, struct cache_head *citem) { struct ip_map *new = container_of(cnew, struct ip_map, h); struct ip_map *item = container_of(citem, struct ip_map, h); strcpy(new->m_class, item->m_class); new->m_addr = item->m_addr; }

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neil brownneil brown6193.85%360.00%
andrew mortonandrew morton34.62%120.00%
alexey dobriyanalexey dobriyan11.54%120.00%
Total65100.00%5100.00%


static void update(struct cache_head *cnew, struct cache_head *citem) { struct ip_map *new = container_of(cnew, struct ip_map, h); struct ip_map *item = container_of(citem, struct ip_map, h); kref_get(&item->m_client->h.ref); new->m_client = item->m_client; }

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neil brownneil brown66100.00%3100.00%
Total66100.00%3100.00%


static struct cache_head *ip_map_alloc(void) { struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL); if (i) return &i->h; else return NULL; }

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neil brownneil brown40100.00%1100.00%
Total40100.00%1100.00%


static void ip_map_request(struct cache_detail *cd, struct cache_head *h, char **bpp, int *blen) { char text_addr[40]; struct ip_map *im = container_of(h, struct ip_map, h); if (ipv6_addr_v4mapped(&(im->m_addr))) { snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]); } else { snprintf(text_addr, 40, "%pI6", &im->m_addr); } qword_add(bpp, blen, im->m_class); qword_add(bpp, blen, text_addr); (*bpp)[-1] = '\n'; }

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neil brownneil brown8970.08%233.33%
aurelien charbonaurelien charbon3527.56%116.67%
harvey harrisonharvey harrison32.36%350.00%
Total127100.00%6100.00%

static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr); static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
static int ip_map_parse(struct cache_detail *cd, char *mesg, int mlen) { /* class ipaddress [domainname] */ /* should be safe just to use the start of the input buffer * for scratch: */ char *buf = mesg; int len; char class[8]; union { struct sockaddr sa; struct sockaddr_in s4; struct sockaddr_in6 s6; } address; struct sockaddr_in6 sin6; int err; struct ip_map *ipmp; struct auth_domain *dom; time_t expiry; if (mesg[mlen-1] != '\n') return -EINVAL; mesg[mlen-1] = 0; /* class */ len = qword_get(&mesg, class, sizeof(class)); if (len <= 0) return -EINVAL; /* ip address */ len = qword_get(&mesg, buf, mlen); if (len <= 0) return -EINVAL; if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0) return -EINVAL; switch (address.sa.sa_family) { case AF_INET: /* Form a mapped IPv4 address in sin6 */ sin6.sin6_family = AF_INET6; ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr, &sin6.sin6_addr); break; #if IS_ENABLED(CONFIG_IPV6) case AF_INET6: memcpy(&sin6, &address.s6, sizeof(sin6)); break; #endif default: return -EINVAL; } expiry = get_expiry(&mesg); if (expiry ==0) return -EINVAL; /* domainname, or empty for NEGATIVE */ len = qword_get(&mesg, buf, mlen); if (len < 0) return -EINVAL; if (len) { dom = unix_domain_find(buf); if (dom == NULL) return -ENOENT; } else dom = NULL; /* IPv6 scope IDs are ignored for now */ ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr); if (ipmp) { err = __ip_map_update(cd, ipmp, container_of(dom, struct unix_domain, h), expiry); } else err = -ENOMEM; if (dom) auth_domain_put(dom); cache_flush(); return err; }

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neil brownneil brown26169.41%646.15%
chuck leverchuck lever7820.74%17.69%
aurelien charbonaurelien charbon195.05%17.69%
pavel emelianovpavel emelianov133.46%215.38%
stanislav kinsburskystanislav kinsbursky41.06%215.38%
eric dumazeteric dumazet10.27%17.69%
Total376100.00%13100.00%


static int ip_map_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) { struct ip_map *im; struct in6_addr addr; char *dom = "-no-domain-"; if (h == NULL) { seq_puts(m, "#class IP domain\n"); return 0; } im = container_of(h, struct ip_map, h); /* class addr domain */ addr = im->m_addr; if (test_bit(CACHE_VALID, &h->flags) && !test_bit(CACHE_NEGATIVE, &h->flags)) dom = im->m_client->h.name; if (ipv6_addr_v4mapped(&addr)) { seq_printf(m, "%s %pI4 %s\n", im->m_class, &addr.s6_addr32[3], dom); } else { seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom); } return 0; }

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neil brownneil brown12377.36%228.57%
aurelien charbonaurelien charbon3220.13%114.29%
harvey harrisonharvey harrison31.89%342.86%
alexey dobriyanalexey dobriyan10.63%114.29%
Total159100.00%7100.00%


static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr) { struct ip_map ip; struct cache_head *ch; strcpy(ip.m_class, class); ip.m_addr = *addr; ch = sunrpc_cache_lookup(cd, &ip.h, hash_str(class, IP_HASHBITS) ^ hash_ip6(addr)); if (ch) return container_of(ch, struct ip_map, h); else return NULL; }

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neil brownneil brown7886.67%350.00%
pavel emelianovpavel emelianov77.78%116.67%
aurelien charbonaurelien charbon33.33%116.67%
alexey dobriyanalexey dobriyan22.22%116.67%
Total90100.00%6100.00%


static inline struct ip_map *ip_map_lookup(struct net *net, char *class, struct in6_addr *addr) { struct sunrpc_net *sn; sn = net_generic(net, sunrpc_net_id); return __ip_map_lookup(sn->ip_map_cache, class, addr); }

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pavel emelianovpavel emelianov49100.00%3100.00%
Total49100.00%3100.00%


static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry) { struct ip_map ip; struct cache_head *ch; ip.m_client = udom; ip.h.flags = 0; if (!udom) set_bit(CACHE_NEGATIVE, &ip.h.flags); ip.h.expiry_time = expiry; ch = sunrpc_cache_update(cd, &ip.h, &ipm->h, hash_str(ipm->m_class, IP_HASHBITS) ^ hash_ip6(&ipm->m_addr)); if (!ch) return -ENOMEM; cache_put(ch, cd); return 0; }

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neil brownneil brown11592.00%350.00%
pavel emelianovpavel emelianov86.40%116.67%
aurelien charbonaurelien charbon10.80%116.67%
eric dumazeteric dumazet10.80%116.67%
Total125100.00%6100.00%


static inline int ip_map_update(struct net *net, struct ip_map *ipm, struct unix_domain *udom, time_t expiry) { struct sunrpc_net *sn; sn = net_generic(net, sunrpc_net_id); return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry); }

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pavel emelianovpavel emelianov53100.00%3100.00%
Total53100.00%3100.00%


void svcauth_unix_purge(struct net *net) { struct sunrpc_net *sn; sn = net_generic(net, sunrpc_net_id); cache_purge(sn->ip_map_cache); }

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pavel emelianovpavel emelianov2167.74%133.33%
neil brownneil brown929.03%133.33%
stanislav kinsburskystanislav kinsbursky13.23%133.33%
Total31100.00%3100.00%

EXPORT_SYMBOL_GPL(svcauth_unix_purge);
static inline struct ip_map * ip_map_cached_get(struct svc_xprt *xprt) { struct ip_map *ipm = NULL; struct sunrpc_net *sn; if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { spin_lock(&xprt->xpt_lock); ipm = xprt->xpt_auth_cache; if (ipm != NULL) { sn = net_generic(xprt->xpt_net, sunrpc_net_id); if (cache_is_expired(sn->ip_map_cache, &ipm->h)) { /* * The entry has been invalidated since it was * remembered, e.g. by a second mount from the * same IP address. */ xprt->xpt_auth_cache = NULL; spin_unlock(&xprt->xpt_lock); cache_put(&ipm->h, sn->ip_map_cache); return NULL; } cache_get(&ipm->h); } spin_unlock(&xprt->xpt_lock); } return ipm; }

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greg banksgreg banks5338.41%112.50%
neil brownneil brown3928.26%450.00%
tom tuckertom tucker2618.84%112.50%
pavel emelianovpavel emelianov2014.49%225.00%
Total138100.00%8100.00%


static inline void ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm) { if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { spin_lock(&xprt->xpt_lock); if (xprt->xpt_auth_cache == NULL) { /* newly cached, keep the reference */ xprt->xpt_auth_cache = ipm; ipm = NULL; } spin_unlock(&xprt->xpt_lock); } if (ipm) { struct sunrpc_net *sn; sn = net_generic(xprt->xpt_net, sunrpc_net_id); cache_put(&ipm->h, sn->ip_map_cache); } }

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greg banksgreg banks3534.31%116.67%
neil brownneil brown2322.55%233.33%
tom tuckertom tucker2221.57%116.67%
pavel emelianovpavel emelianov2221.57%233.33%
Total102100.00%6100.00%


void svcauth_unix_info_release(struct svc_xprt *xpt) { struct ip_map *ipm; ipm = xpt->xpt_auth_cache; if (ipm != NULL) { struct sunrpc_net *sn; sn = net_generic(xpt->xpt_net, sunrpc_net_id); cache_put(&ipm->h, sn->ip_map_cache); } }

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pavel emelianovpavel emelianov3561.40%266.67%
greg banksgreg banks2238.60%133.33%
Total57100.00%3100.00%

/**************************************************************************** * auth.unix.gid cache * simple cache to map a UID to a list of GIDs * because AUTH_UNIX aka AUTH_SYS has a max of 16 */ #define GID_HASHBITS 8 #define GID_HASHMAX (1<<GID_HASHBITS) struct unix_gid { struct cache_head h; kuid_t uid; struct group_info *gi; };
static int unix_gid_hash(kuid_t uid) { return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS); }

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eric w. biedermaneric w. biederman23100.00%1100.00%
Total23100.00%1100.00%


static void unix_gid_put(struct kref *kref) { struct cache_head *item = container_of(kref, struct cache_head, ref); struct unix_gid *ug = container_of(item, struct unix_gid, h); if (test_bit(CACHE_VALID, &item->flags) && !test_bit(CACHE_NEGATIVE, &item->flags)) put_group_info(ug->gi); kfree(ug); }

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neil brownneil brown76100.00%1100.00%
Total76100.00%1100.00%


static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew) { struct unix_gid *orig = container_of(corig, struct unix_gid, h); struct unix_gid *new = container_of(cnew, struct unix_gid, h); return uid_eq(orig->uid, new->uid); }

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neil brownneil brown5493.10%150.00%
eric w. biedermaneric w. biederman46.90%150.00%
Total58100.00%2100.00%


static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem) { struct unix_gid *new = container_of(cnew, struct unix_gid, h); struct unix_gid *item = container_of(citem, struct unix_gid, h); new->uid = item->uid; }

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neil brownneil brown54100.00%1100.00%
Total54100.00%1100.00%


static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem) { struct unix_gid *new = container_of(cnew, struct unix_gid, h); struct unix_gid *item = container_of(citem, struct unix_gid, h); get_group_info(item->gi); new->gi = item->gi; }

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neil brownneil brown61100.00%1100.00%
Total61100.00%1100.00%


static struct cache_head *unix_gid_alloc(void) { struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL); if (g) return &g->h; else return NULL; }

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neil brownneil brown40100.00%1100.00%
Total40100.00%1100.00%


static void unix_gid_request(struct cache_detail *cd, struct cache_head *h, char **bpp, int *blen) { char tuid[20]; struct unix_gid *ug = container_of(h, struct unix_gid, h); snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid)); qword_add(bpp, blen, tuid); (*bpp)[-1] = '\n'; }

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neil brownneil brown7992.94%150.00%
eric w. biedermaneric w. biederman67.06%150.00%
Total85100.00%2100.00%

static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
static int unix_gid_parse(struct cache_detail *cd, char *mesg, int mlen) { /* uid expiry Ngid gid0 gid1 ... gidN-1 */ int id; kuid_t uid; int gids; int rv; int i; int err; time_t expiry; struct unix_gid ug, *ugp; if (mesg[mlen - 1] != '\n') return -EINVAL; mesg[mlen-1] = 0; rv = get_int(&mesg, &id); if (rv) return -EINVAL; uid = make_kuid(&init_user_ns, id); ug.uid = uid; expiry = get_expiry(&mesg); if (expiry == 0) return -EINVAL; rv = get_int(&mesg, &gids); if (rv || gids < 0 || gids > 8192) return -EINVAL; ug.gi = groups_alloc(gids); if (!ug.gi) return -ENOMEM; for (i = 0 ; i < gids ; i++) { int gid; kgid_t kgid; rv = get_int(&mesg, &gid); err = -EINVAL; if (rv) goto out; kgid = make_kgid(&init_user_ns, gid); if (!gid_valid(kgid)) goto out; GROUP_AT(ug.gi, i) = kgid; } ugp = unix_gid_lookup(cd, uid); if (ugp) { struct cache_head *ch; ug.h.flags = 0; ug.h.expiry_time