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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-09 21:51:06 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-04-09 21:51:06 +0300 |
commit | 60144b23c94216b4aca6fba90dca9349183f39e1 (patch) | |
tree | d8377c1d2896c0c61b955c24bdbceee7789d21c6 /security/selinux/ss/avtab.c | |
parent | 189fefc7a4f0401d0f799de96b772319a6541fc1 (diff) | |
parent | 9ad6e9cb39c66366bf7b9aece114aca277981a1f (diff) | |
download | linux-60144b23c94216b4aca6fba90dca9349183f39e1.tar.xz |
Merge tag 'selinux-pr-20210409' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux
Pull selinux fixes from Paul Moore:
"Three SELinux fixes.
These fix known problems relating to (re)loading SELinux policy or
changing the policy booleans, and pass our test suite without problem"
* tag 'selinux-pr-20210409' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
selinux: fix race between old and new sidtab
selinux: fix cond_list corruption when changing booleans
selinux: make nslot handling in avtab more robust
Diffstat (limited to 'security/selinux/ss/avtab.c')
-rw-r--r-- | security/selinux/ss/avtab.c | 101 |
1 files changed, 33 insertions, 68 deletions
diff --git a/security/selinux/ss/avtab.c b/security/selinux/ss/avtab.c index 6dcb6aa4db7f..75df32906055 100644 --- a/security/selinux/ss/avtab.c +++ b/security/selinux/ss/avtab.c @@ -109,7 +109,7 @@ static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_dat struct avtab_node *prev, *cur, *newnode; u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); - if (!h) + if (!h || !h->nslot) return -EINVAL; hvalue = avtab_hash(key, h->mask); @@ -154,7 +154,7 @@ avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datu struct avtab_node *prev, *cur; u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); - if (!h) + if (!h || !h->nslot) return NULL; hvalue = avtab_hash(key, h->mask); for (prev = NULL, cur = h->htable[hvalue]; @@ -184,7 +184,7 @@ struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key) struct avtab_node *cur; u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); - if (!h) + if (!h || !h->nslot) return NULL; hvalue = avtab_hash(key, h->mask); @@ -220,7 +220,7 @@ avtab_search_node(struct avtab *h, struct avtab_key *key) struct avtab_node *cur; u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); - if (!h) + if (!h || !h->nslot) return NULL; hvalue = avtab_hash(key, h->mask); @@ -295,6 +295,7 @@ void avtab_destroy(struct avtab *h) } kvfree(h->htable); h->htable = NULL; + h->nel = 0; h->nslot = 0; h->mask = 0; } @@ -303,88 +304,52 @@ void avtab_init(struct avtab *h) { h->htable = NULL; h->nel = 0; + h->nslot = 0; + h->mask = 0; } -int avtab_alloc(struct avtab *h, u32 nrules) +static int avtab_alloc_common(struct avtab *h, u32 nslot) { - u32 mask = 0; - u32 shift = 0; - u32 work = nrules; - u32 nslot = 0; - - if (nrules == 0) - goto avtab_alloc_out; - - while (work) { - work = work >> 1; - shift++; - } - if (shift > 2) - shift = shift - 2; - nslot = 1 << shift; - if (nslot > MAX_AVTAB_HASH_BUCKETS) - nslot = MAX_AVTAB_HASH_BUCKETS; - mask = nslot - 1; + if (!nslot) + return 0; h->htable = kvcalloc(nslot, sizeof(void *), GFP_KERNEL); if (!h->htable) return -ENOMEM; - avtab_alloc_out: - h->nel = 0; h->nslot = nslot; - h->mask = mask; - pr_debug("SELinux: %d avtab hash slots, %d rules.\n", - h->nslot, nrules); + h->mask = nslot - 1; return 0; } -int avtab_duplicate(struct avtab *new, struct avtab *orig) +int avtab_alloc(struct avtab *h, u32 nrules) { - int i; - struct avtab_node *node, *tmp, *tail; - - memset(new, 0, sizeof(*new)); + int rc; + u32 nslot = 0; - new->htable = kvcalloc(orig->nslot, sizeof(void *), GFP_KERNEL); - if (!new->htable) - return -ENOMEM; - new->nslot = orig->nslot; - new->mask = orig->mask; - - for (i = 0; i < orig->nslot; i++) { - tail = NULL; - for (node = orig->htable[i]; node; node = node->next) { - tmp = kmem_cache_zalloc(avtab_node_cachep, GFP_KERNEL); - if (!tmp) - goto error; - tmp->key = node->key; - if (tmp->key.specified & AVTAB_XPERMS) { - tmp->datum.u.xperms = - kmem_cache_zalloc(avtab_xperms_cachep, - GFP_KERNEL); - if (!tmp->datum.u.xperms) { - kmem_cache_free(avtab_node_cachep, tmp); - goto error; - } - tmp->datum.u.xperms = node->datum.u.xperms; - } else - tmp->datum.u.data = node->datum.u.data; - - if (tail) - tail->next = tmp; - else - new->htable[i] = tmp; - - tail = tmp; - new->nel++; + if (nrules != 0) { + u32 shift = 1; + u32 work = nrules >> 3; + while (work) { + work >>= 1; + shift++; } + nslot = 1 << shift; + if (nslot > MAX_AVTAB_HASH_BUCKETS) + nslot = MAX_AVTAB_HASH_BUCKETS; + + rc = avtab_alloc_common(h, nslot); + if (rc) + return rc; } + pr_debug("SELinux: %d avtab hash slots, %d rules.\n", nslot, nrules); return 0; -error: - avtab_destroy(new); - return -ENOMEM; +} + +int avtab_alloc_dup(struct avtab *new, const struct avtab *orig) +{ + return avtab_alloc_common(new, orig->nslot); } void avtab_hash_eval(struct avtab *h, char *tag) |