![Waiman Long](/assets/img/avatar_default.png)
While running the high_systime workload of the AIM7 benchmark on a 2-socket 12-core Westmere x86-64 machine running 3.10-rc4 kernel (with HT on), it was found that a pretty sizable amount of time was spent in the SELinux code. Below was the perf trace of the "perf record -a -s" of a test run at 1500 users: 5.04% ls [kernel.kallsyms] [k] ebitmap_get_bit 1.96% ls [kernel.kallsyms] [k] mls_level_isvalid 1.95% ls [kernel.kallsyms] [k] find_next_bit The ebitmap_get_bit() was the hottest function in the perf-report output. Both the ebitmap_get_bit() and find_next_bit() functions were, in fact, called by mls_level_isvalid(). As a result, the mls_level_isvalid() call consumed 8.95% of the total CPU time of all the 24 virtual CPUs which is quite a lot. The majority of the mls_level_isvalid() function invocations come from the socket creation system call. Looking at the mls_level_isvalid() function, it is checking to see if all the bits set in one of the ebitmap structure are also set in another one as well as the highest set bit is no bigger than the one specified by the given policydb data structure. It is doing it in a bit-by-bit manner. So if the ebitmap structure has many bits set, the iteration loop will be done many times. The current code can be rewritten to use a similar algorithm as the ebitmap_contains() function with an additional check for the highest set bit. The ebitmap_contains() function was extended to cover an optional additional check for the highest set bit, and the mls_level_isvalid() function was modified to call ebitmap_contains(). With that change, the perf trace showed that the used CPU time drop down to just 0.08% (ebitmap_contains + mls_level_isvalid) of the total which is about 100X less than before. 0.07% ls [kernel.kallsyms] [k] ebitmap_contains 0.05% ls [kernel.kallsyms] [k] ebitmap_get_bit 0.01% ls [kernel.kallsyms] [k] mls_level_isvalid 0.01% ls [kernel.kallsyms] [k] find_next_bit The remaining ebitmap_get_bit() and find_next_bit() functions calls are made by other kernel routines as the new mls_level_isvalid() function will not call them anymore. This patch also improves the high_systime AIM7 benchmark result, though the improvement is not as impressive as is suggested by the reduction in CPU time spent in the ebitmap functions. The table below shows the performance change on the 2-socket x86-64 system (with HT on) mentioned above. +--------------+---------------+----------------+-----------------+ | Workload | mean % change | mean % change | mean % change | | | 10-100 users | 200-1000 users | 1100-2000 users | +--------------+---------------+----------------+-----------------+ | high_systime | +0.1% | +0.9% | +2.6% | +--------------+---------------+----------------+-----------------+ Signed-off-by: Waiman Long <Waiman.Long@hp.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <pmoore@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com>
671 lines
16 KiB
C
671 lines
16 KiB
C
/*
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* Implementation of the multi-level security (MLS) policy.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*/
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/*
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* Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
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*
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* Support for enhanced MLS infrastructure.
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*
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* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
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*/
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/*
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* Updated: Hewlett-Packard <paul@paul-moore.com>
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*
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* Added support to import/export the MLS label from NetLabel
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*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <net/netlabel.h>
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#include "sidtab.h"
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#include "mls.h"
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#include "policydb.h"
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#include "services.h"
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/*
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* Return the length in bytes for the MLS fields of the
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* security context string representation of `context'.
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*/
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int mls_compute_context_len(struct context *context)
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{
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int i, l, len, head, prev;
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char *nm;
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struct ebitmap *e;
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struct ebitmap_node *node;
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if (!policydb.mls_enabled)
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return 0;
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len = 1; /* for the beginning ":" */
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for (l = 0; l < 2; l++) {
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int index_sens = context->range.level[l].sens;
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len += strlen(sym_name(&policydb, SYM_LEVELS, index_sens - 1));
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/* categories */
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head = -2;
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prev = -2;
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e = &context->range.level[l].cat;
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ebitmap_for_each_positive_bit(e, node, i) {
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if (i - prev > 1) {
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/* one or more negative bits are skipped */
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if (head != prev) {
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nm = sym_name(&policydb, SYM_CATS, prev);
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len += strlen(nm) + 1;
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}
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nm = sym_name(&policydb, SYM_CATS, i);
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len += strlen(nm) + 1;
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head = i;
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}
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prev = i;
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}
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if (prev != head) {
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nm = sym_name(&policydb, SYM_CATS, prev);
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len += strlen(nm) + 1;
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}
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if (l == 0) {
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if (mls_level_eq(&context->range.level[0],
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&context->range.level[1]))
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break;
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else
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len++;
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}
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}
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return len;
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}
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/*
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* Write the security context string representation of
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* the MLS fields of `context' into the string `*scontext'.
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* Update `*scontext' to point to the end of the MLS fields.
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*/
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void mls_sid_to_context(struct context *context,
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char **scontext)
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{
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char *scontextp, *nm;
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int i, l, head, prev;
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struct ebitmap *e;
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struct ebitmap_node *node;
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if (!policydb.mls_enabled)
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return;
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scontextp = *scontext;
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*scontextp = ':';
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scontextp++;
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for (l = 0; l < 2; l++) {
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strcpy(scontextp, sym_name(&policydb, SYM_LEVELS,
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context->range.level[l].sens - 1));
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scontextp += strlen(scontextp);
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/* categories */
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head = -2;
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prev = -2;
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e = &context->range.level[l].cat;
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ebitmap_for_each_positive_bit(e, node, i) {
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if (i - prev > 1) {
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/* one or more negative bits are skipped */
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if (prev != head) {
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if (prev - head > 1)
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*scontextp++ = '.';
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else
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*scontextp++ = ',';
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nm = sym_name(&policydb, SYM_CATS, prev);
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strcpy(scontextp, nm);
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scontextp += strlen(nm);
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}
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if (prev < 0)
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*scontextp++ = ':';
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else
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*scontextp++ = ',';
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nm = sym_name(&policydb, SYM_CATS, i);
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strcpy(scontextp, nm);
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scontextp += strlen(nm);
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head = i;
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}
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prev = i;
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}
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if (prev != head) {
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if (prev - head > 1)
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*scontextp++ = '.';
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else
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*scontextp++ = ',';
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nm = sym_name(&policydb, SYM_CATS, prev);
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strcpy(scontextp, nm);
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scontextp += strlen(nm);
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}
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if (l == 0) {
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if (mls_level_eq(&context->range.level[0],
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&context->range.level[1]))
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break;
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else
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*scontextp++ = '-';
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}
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}
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*scontext = scontextp;
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return;
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}
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int mls_level_isvalid(struct policydb *p, struct mls_level *l)
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{
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struct level_datum *levdatum;
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if (!l->sens || l->sens > p->p_levels.nprim)
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return 0;
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levdatum = hashtab_search(p->p_levels.table,
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sym_name(p, SYM_LEVELS, l->sens - 1));
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if (!levdatum)
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return 0;
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/*
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* Return 1 iff all the bits set in l->cat are also be set in
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* levdatum->level->cat and no bit in l->cat is larger than
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* p->p_cats.nprim.
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*/
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return ebitmap_contains(&levdatum->level->cat, &l->cat,
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p->p_cats.nprim);
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}
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int mls_range_isvalid(struct policydb *p, struct mls_range *r)
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{
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return (mls_level_isvalid(p, &r->level[0]) &&
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mls_level_isvalid(p, &r->level[1]) &&
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mls_level_dom(&r->level[1], &r->level[0]));
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}
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/*
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* Return 1 if the MLS fields in the security context
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* structure `c' are valid. Return 0 otherwise.
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*/
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int mls_context_isvalid(struct policydb *p, struct context *c)
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{
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struct user_datum *usrdatum;
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if (!p->mls_enabled)
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return 1;
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if (!mls_range_isvalid(p, &c->range))
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return 0;
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if (c->role == OBJECT_R_VAL)
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return 1;
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/*
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* User must be authorized for the MLS range.
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*/
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if (!c->user || c->user > p->p_users.nprim)
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return 0;
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usrdatum = p->user_val_to_struct[c->user - 1];
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if (!mls_range_contains(usrdatum->range, c->range))
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return 0; /* user may not be associated with range */
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return 1;
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}
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/*
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* Set the MLS fields in the security context structure
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* `context' based on the string representation in
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* the string `*scontext'. Update `*scontext' to
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* point to the end of the string representation of
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* the MLS fields.
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*
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* This function modifies the string in place, inserting
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* NULL characters to terminate the MLS fields.
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*
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* If a def_sid is provided and no MLS field is present,
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* copy the MLS field of the associated default context.
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* Used for upgraded to MLS systems where objects may lack
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* MLS fields.
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*
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* Policy read-lock must be held for sidtab lookup.
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*
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*/
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int mls_context_to_sid(struct policydb *pol,
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char oldc,
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char **scontext,
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struct context *context,
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struct sidtab *s,
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u32 def_sid)
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{
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char delim;
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char *scontextp, *p, *rngptr;
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struct level_datum *levdatum;
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struct cat_datum *catdatum, *rngdatum;
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int l, rc = -EINVAL;
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if (!pol->mls_enabled) {
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if (def_sid != SECSID_NULL && oldc)
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*scontext += strlen(*scontext) + 1;
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return 0;
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}
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/*
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* No MLS component to the security context, try and map to
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* default if provided.
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*/
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if (!oldc) {
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struct context *defcon;
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if (def_sid == SECSID_NULL)
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goto out;
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defcon = sidtab_search(s, def_sid);
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if (!defcon)
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goto out;
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rc = mls_context_cpy(context, defcon);
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goto out;
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}
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/* Extract low sensitivity. */
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scontextp = p = *scontext;
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while (*p && *p != ':' && *p != '-')
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p++;
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delim = *p;
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if (delim != '\0')
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*p++ = '\0';
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for (l = 0; l < 2; l++) {
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levdatum = hashtab_search(pol->p_levels.table, scontextp);
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if (!levdatum) {
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rc = -EINVAL;
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goto out;
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}
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context->range.level[l].sens = levdatum->level->sens;
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if (delim == ':') {
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/* Extract category set. */
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while (1) {
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scontextp = p;
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while (*p && *p != ',' && *p != '-')
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p++;
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delim = *p;
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if (delim != '\0')
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*p++ = '\0';
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/* Separate into range if exists */
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rngptr = strchr(scontextp, '.');
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if (rngptr != NULL) {
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/* Remove '.' */
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*rngptr++ = '\0';
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}
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catdatum = hashtab_search(pol->p_cats.table,
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scontextp);
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if (!catdatum) {
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rc = -EINVAL;
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goto out;
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}
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rc = ebitmap_set_bit(&context->range.level[l].cat,
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catdatum->value - 1, 1);
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if (rc)
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goto out;
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/* If range, set all categories in range */
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if (rngptr) {
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int i;
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rngdatum = hashtab_search(pol->p_cats.table, rngptr);
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if (!rngdatum) {
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rc = -EINVAL;
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goto out;
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}
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if (catdatum->value >= rngdatum->value) {
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rc = -EINVAL;
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goto out;
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}
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for (i = catdatum->value; i < rngdatum->value; i++) {
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rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1);
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if (rc)
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goto out;
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}
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}
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if (delim != ',')
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break;
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}
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}
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if (delim == '-') {
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/* Extract high sensitivity. */
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scontextp = p;
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while (*p && *p != ':')
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p++;
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delim = *p;
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if (delim != '\0')
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*p++ = '\0';
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} else
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break;
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}
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if (l == 0) {
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context->range.level[1].sens = context->range.level[0].sens;
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rc = ebitmap_cpy(&context->range.level[1].cat,
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&context->range.level[0].cat);
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if (rc)
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goto out;
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}
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*scontext = ++p;
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rc = 0;
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out:
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return rc;
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}
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/*
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* Set the MLS fields in the security context structure
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* `context' based on the string representation in
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* the string `str'. This function will allocate temporary memory with the
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* given constraints of gfp_mask.
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*/
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int mls_from_string(char *str, struct context *context, gfp_t gfp_mask)
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{
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char *tmpstr, *freestr;
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int rc;
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if (!policydb.mls_enabled)
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return -EINVAL;
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/* we need freestr because mls_context_to_sid will change
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the value of tmpstr */
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tmpstr = freestr = kstrdup(str, gfp_mask);
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if (!tmpstr) {
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rc = -ENOMEM;
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} else {
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rc = mls_context_to_sid(&policydb, ':', &tmpstr, context,
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NULL, SECSID_NULL);
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kfree(freestr);
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}
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return rc;
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}
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/*
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* Copies the MLS range `range' into `context'.
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*/
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int mls_range_set(struct context *context,
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struct mls_range *range)
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{
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int l, rc = 0;
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/* Copy the MLS range into the context */
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for (l = 0; l < 2; l++) {
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context->range.level[l].sens = range->level[l].sens;
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rc = ebitmap_cpy(&context->range.level[l].cat,
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&range->level[l].cat);
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if (rc)
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break;
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}
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return rc;
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}
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int mls_setup_user_range(struct context *fromcon, struct user_datum *user,
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struct context *usercon)
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{
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if (policydb.mls_enabled) {
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struct mls_level *fromcon_sen = &(fromcon->range.level[0]);
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struct mls_level *fromcon_clr = &(fromcon->range.level[1]);
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struct mls_level *user_low = &(user->range.level[0]);
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struct mls_level *user_clr = &(user->range.level[1]);
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struct mls_level *user_def = &(user->dfltlevel);
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struct mls_level *usercon_sen = &(usercon->range.level[0]);
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struct mls_level *usercon_clr = &(usercon->range.level[1]);
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/* Honor the user's default level if we can */
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if (mls_level_between(user_def, fromcon_sen, fromcon_clr))
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*usercon_sen = *user_def;
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else if (mls_level_between(fromcon_sen, user_def, user_clr))
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*usercon_sen = *fromcon_sen;
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else if (mls_level_between(fromcon_clr, user_low, user_def))
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*usercon_sen = *user_low;
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else
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return -EINVAL;
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/* Lower the clearance of available contexts
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if the clearance of "fromcon" is lower than
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that of the user's default clearance (but
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only if the "fromcon" clearance dominates
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the user's computed sensitivity level) */
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if (mls_level_dom(user_clr, fromcon_clr))
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*usercon_clr = *fromcon_clr;
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else if (mls_level_dom(fromcon_clr, user_clr))
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*usercon_clr = *user_clr;
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else
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Convert the MLS fields in the security context
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* structure `c' from the values specified in the
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* policy `oldp' to the values specified in the policy `newp'.
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*/
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int mls_convert_context(struct policydb *oldp,
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struct policydb *newp,
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struct context *c)
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{
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struct level_datum *levdatum;
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struct cat_datum *catdatum;
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struct ebitmap bitmap;
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struct ebitmap_node *node;
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int l, i;
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if (!policydb.mls_enabled)
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return 0;
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for (l = 0; l < 2; l++) {
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levdatum = hashtab_search(newp->p_levels.table,
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sym_name(oldp, SYM_LEVELS,
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c->range.level[l].sens - 1));
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if (!levdatum)
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return -EINVAL;
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c->range.level[l].sens = levdatum->level->sens;
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ebitmap_init(&bitmap);
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ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) {
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int rc;
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catdatum = hashtab_search(newp->p_cats.table,
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sym_name(oldp, SYM_CATS, i));
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if (!catdatum)
|
|
return -EINVAL;
|
|
rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
ebitmap_destroy(&c->range.level[l].cat);
|
|
c->range.level[l].cat = bitmap;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mls_compute_sid(struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
u32 specified,
|
|
struct context *newcontext,
|
|
bool sock)
|
|
{
|
|
struct range_trans rtr;
|
|
struct mls_range *r;
|
|
struct class_datum *cladatum;
|
|
int default_range = 0;
|
|
|
|
if (!policydb.mls_enabled)
|
|
return 0;
|
|
|
|
switch (specified) {
|
|
case AVTAB_TRANSITION:
|
|
/* Look for a range transition rule. */
|
|
rtr.source_type = scontext->type;
|
|
rtr.target_type = tcontext->type;
|
|
rtr.target_class = tclass;
|
|
r = hashtab_search(policydb.range_tr, &rtr);
|
|
if (r)
|
|
return mls_range_set(newcontext, r);
|
|
|
|
if (tclass && tclass <= policydb.p_classes.nprim) {
|
|
cladatum = policydb.class_val_to_struct[tclass - 1];
|
|
if (cladatum)
|
|
default_range = cladatum->default_range;
|
|
}
|
|
|
|
switch (default_range) {
|
|
case DEFAULT_SOURCE_LOW:
|
|
return mls_context_cpy_low(newcontext, scontext);
|
|
case DEFAULT_SOURCE_HIGH:
|
|
return mls_context_cpy_high(newcontext, scontext);
|
|
case DEFAULT_SOURCE_LOW_HIGH:
|
|
return mls_context_cpy(newcontext, scontext);
|
|
case DEFAULT_TARGET_LOW:
|
|
return mls_context_cpy_low(newcontext, tcontext);
|
|
case DEFAULT_TARGET_HIGH:
|
|
return mls_context_cpy_high(newcontext, tcontext);
|
|
case DEFAULT_TARGET_LOW_HIGH:
|
|
return mls_context_cpy(newcontext, tcontext);
|
|
}
|
|
|
|
/* Fallthrough */
|
|
case AVTAB_CHANGE:
|
|
if ((tclass == policydb.process_class) || (sock == true))
|
|
/* Use the process MLS attributes. */
|
|
return mls_context_cpy(newcontext, scontext);
|
|
else
|
|
/* Use the process effective MLS attributes. */
|
|
return mls_context_cpy_low(newcontext, scontext);
|
|
case AVTAB_MEMBER:
|
|
/* Use the process effective MLS attributes. */
|
|
return mls_context_cpy_low(newcontext, scontext);
|
|
|
|
/* fall through */
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
/**
|
|
* mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel
|
|
* @context: the security context
|
|
* @secattr: the NetLabel security attributes
|
|
*
|
|
* Description:
|
|
* Given the security context copy the low MLS sensitivity level into the
|
|
* NetLabel MLS sensitivity level field.
|
|
*
|
|
*/
|
|
void mls_export_netlbl_lvl(struct context *context,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
if (!policydb.mls_enabled)
|
|
return;
|
|
|
|
secattr->attr.mls.lvl = context->range.level[0].sens - 1;
|
|
secattr->flags |= NETLBL_SECATTR_MLS_LVL;
|
|
}
|
|
|
|
/**
|
|
* mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels
|
|
* @context: the security context
|
|
* @secattr: the NetLabel security attributes
|
|
*
|
|
* Description:
|
|
* Given the security context and the NetLabel security attributes, copy the
|
|
* NetLabel MLS sensitivity level into the context.
|
|
*
|
|
*/
|
|
void mls_import_netlbl_lvl(struct context *context,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
if (!policydb.mls_enabled)
|
|
return;
|
|
|
|
context->range.level[0].sens = secattr->attr.mls.lvl + 1;
|
|
context->range.level[1].sens = context->range.level[0].sens;
|
|
}
|
|
|
|
/**
|
|
* mls_export_netlbl_cat - Export the MLS categories to NetLabel
|
|
* @context: the security context
|
|
* @secattr: the NetLabel security attributes
|
|
*
|
|
* Description:
|
|
* Given the security context copy the low MLS categories into the NetLabel
|
|
* MLS category field. Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int mls_export_netlbl_cat(struct context *context,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int rc;
|
|
|
|
if (!policydb.mls_enabled)
|
|
return 0;
|
|
|
|
rc = ebitmap_netlbl_export(&context->range.level[0].cat,
|
|
&secattr->attr.mls.cat);
|
|
if (rc == 0 && secattr->attr.mls.cat != NULL)
|
|
secattr->flags |= NETLBL_SECATTR_MLS_CAT;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* mls_import_netlbl_cat - Import the MLS categories from NetLabel
|
|
* @context: the security context
|
|
* @secattr: the NetLabel security attributes
|
|
*
|
|
* Description:
|
|
* Copy the NetLabel security attributes into the SELinux context; since the
|
|
* NetLabel security attribute only contains a single MLS category use it for
|
|
* both the low and high categories of the context. Returns zero on success,
|
|
* negative values on failure.
|
|
*
|
|
*/
|
|
int mls_import_netlbl_cat(struct context *context,
|
|
struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int rc;
|
|
|
|
if (!policydb.mls_enabled)
|
|
return 0;
|
|
|
|
rc = ebitmap_netlbl_import(&context->range.level[0].cat,
|
|
secattr->attr.mls.cat);
|
|
if (rc != 0)
|
|
goto import_netlbl_cat_failure;
|
|
|
|
rc = ebitmap_cpy(&context->range.level[1].cat,
|
|
&context->range.level[0].cat);
|
|
if (rc != 0)
|
|
goto import_netlbl_cat_failure;
|
|
|
|
return 0;
|
|
|
|
import_netlbl_cat_failure:
|
|
ebitmap_destroy(&context->range.level[0].cat);
|
|
ebitmap_destroy(&context->range.level[1].cat);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|