diff options
author | KaiGai Kohei <kaigai@ak.jp.nec.com> | 2007-09-29 02:20:55 +0900 |
---|---|---|
committer | James Morris <jmorris@namei.org> | 2007-10-17 08:59:34 +1000 |
commit | 9fe79ad1e43d236bbbb8edb3cf634356de714c79 (patch) | |
tree | 91149cefa28baf692eb55f88f8c544a33e9126df /security/selinux | |
parent | 3f12070e27b4a213d62607d2bff139793089a77d (diff) | |
download | kernel_samsung_tuna-9fe79ad1e43d236bbbb8edb3cf634356de714c79.zip kernel_samsung_tuna-9fe79ad1e43d236bbbb8edb3cf634356de714c79.tar.gz kernel_samsung_tuna-9fe79ad1e43d236bbbb8edb3cf634356de714c79.tar.bz2 |
SELinux: improve performance when AVC misses.
* We add ebitmap_for_each_positive_bit() which enables to walk on
any positive bit on the given ebitmap, to improve its performance
using common bit-operations defined in linux/bitops.h.
In the previous version, this logic was implemented using a combination
of ebitmap_for_each_bit() and ebitmap_node_get_bit(), but is was worse
in performance aspect.
This logic is most frequestly used to compute a new AVC entry,
so this patch can improve SELinux performance when AVC misses are happen.
* struct ebitmap_node is redefined as an array of "unsigned long", to get
suitable for using find_next_bit() which is fasted than iteration of
shift and logical operation, and to maximize memory usage allocated
from general purpose slab.
* Any ebitmap_for_each_bit() are repleced by the new implementation
in ss/service.c and ss/mls.c. Some of related implementation are
changed, however, there is no incompatibility with the previous
version.
* The width of any new line are less or equal than 80-chars.
The following benchmark shows the effect of this patch, when we
access many files which have different security context one after
another. The number is more than /selinux/avc/cache_threshold, so
any access always causes AVC misses.
selinux-2.6 selinux-2.6-ebitmap
AVG: 22.763 [s] 8.750 [s]
STD: 0.265 0.019
------------------------------------------
1st: 22.558 [s] 8.786 [s]
2nd: 22.458 [s] 8.750 [s]
3rd: 22.478 [s] 8.754 [s]
4th: 22.724 [s] 8.745 [s]
5th: 22.918 [s] 8.748 [s]
6th: 22.905 [s] 8.764 [s]
7th: 23.238 [s] 8.726 [s]
8th: 22.822 [s] 8.729 [s]
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux')
-rw-r--r-- | security/selinux/ss/ebitmap.c | 281 | ||||
-rw-r--r-- | security/selinux/ss/ebitmap.h | 87 | ||||
-rw-r--r-- | security/selinux/ss/mls.c | 156 | ||||
-rw-r--r-- | security/selinux/ss/services.c | 16 |
4 files changed, 303 insertions, 237 deletions
diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c index ce492a6..ae44c0c 100644 --- a/security/selinux/ss/ebitmap.c +++ b/security/selinux/ss/ebitmap.c @@ -10,6 +10,10 @@ * * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 */ +/* + * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> + * Applied standard bit operations to improve bitmap scanning. + */ #include <linux/kernel.h> #include <linux/slab.h> @@ -29,7 +33,7 @@ int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2) n2 = e2->node; while (n1 && n2 && (n1->startbit == n2->startbit) && - (n1->map == n2->map)) { + !memcmp(n1->maps, n2->maps, EBITMAP_SIZE / 8)) { n1 = n1->next; n2 = n2->next; } @@ -54,7 +58,7 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src) return -ENOMEM; } new->startbit = n->startbit; - new->map = n->map; + memcpy(new->maps, n->maps, EBITMAP_SIZE / 8); new->next = NULL; if (prev) prev->next = new; @@ -84,13 +88,15 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap, { struct ebitmap_node *e_iter = ebmap->node; struct netlbl_lsm_secattr_catmap *c_iter; - u32 cmap_idx; + u32 cmap_idx, cmap_sft; + int i; - /* This function is a much simpler because SELinux's MAPTYPE happens - * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is - * changed from a u64 this function will most likely need to be changed - * as well. It's not ideal but I think the tradeoff in terms of - * neatness and speed is worth it. */ + /* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64, + * however, it is not always compatible with an array of unsigned long + * in ebitmap_node. + * In addition, you should pay attention the following implementation + * assumes unsigned long has a width equal with or less than 64-bit. + */ if (e_iter == NULL) { *catmap = NULL; @@ -104,19 +110,27 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap, c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1); while (e_iter != NULL) { - if (e_iter->startbit >= - (c_iter->startbit + NETLBL_CATMAP_SIZE)) { - c_iter->next = netlbl_secattr_catmap_alloc(GFP_ATOMIC); - if (c_iter->next == NULL) - goto netlbl_export_failure; - c_iter = c_iter->next; - c_iter->startbit = e_iter->startbit & - ~(NETLBL_CATMAP_SIZE - 1); + for (i = 0; i < EBITMAP_UNIT_NUMS; i++) { + unsigned int delta, e_startbit, c_endbit; + + e_startbit = e_iter->startbit + i * EBITMAP_UNIT_SIZE; + c_endbit = c_iter->startbit + NETLBL_CATMAP_SIZE; + if (e_startbit >= c_endbit) { + c_iter->next + = netlbl_secattr_catmap_alloc(GFP_ATOMIC); + if (c_iter->next == NULL) + goto netlbl_export_failure; + c_iter = c_iter->next; + c_iter->startbit + = e_startbit & ~(NETLBL_CATMAP_SIZE - 1); + } + delta = e_startbit - c_iter->startbit; + cmap_idx = delta / NETLBL_CATMAP_MAPSIZE; + cmap_sft = delta % NETLBL_CATMAP_MAPSIZE; + c_iter->bitmap[cmap_idx] + |= e_iter->maps[cmap_idx] << cmap_sft; + e_iter = e_iter->next; } - cmap_idx = (e_iter->startbit - c_iter->startbit) / - NETLBL_CATMAP_MAPSIZE; - c_iter->bitmap[cmap_idx] = e_iter->map; - e_iter = e_iter->next; } return 0; @@ -128,7 +142,7 @@ netlbl_export_failure: /** * ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap - * @ebmap: the ebitmap to export + * @ebmap: the ebitmap to import * @catmap: the NetLabel category bitmap * * Description: @@ -142,36 +156,50 @@ int ebitmap_netlbl_import(struct ebitmap *ebmap, struct ebitmap_node *e_iter = NULL; struct ebitmap_node *emap_prev = NULL; struct netlbl_lsm_secattr_catmap *c_iter = catmap; - u32 c_idx; + u32 c_idx, c_pos, e_idx, e_sft; - /* This function is a much simpler because SELinux's MAPTYPE happens - * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is - * changed from a u64 this function will most likely need to be changed - * as well. It's not ideal but I think the tradeoff in terms of - * neatness and speed is worth it. */ + /* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64, + * however, it is not always compatible with an array of unsigned long + * in ebitmap_node. + * In addition, you should pay attention the following implementation + * assumes unsigned long has a width equal with or less than 64-bit. + */ do { for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) { - if (c_iter->bitmap[c_idx] == 0) + unsigned int delta; + u64 map = c_iter->bitmap[c_idx]; + + if (!map) continue; - e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC); - if (e_iter == NULL) - goto netlbl_import_failure; - if (emap_prev == NULL) - ebmap->node = e_iter; - else - emap_prev->next = e_iter; - emap_prev = e_iter; - - e_iter->startbit = c_iter->startbit + - NETLBL_CATMAP_MAPSIZE * c_idx; - e_iter->map = c_iter->bitmap[c_idx]; + c_pos = c_iter->startbit + + c_idx * NETLBL_CATMAP_MAPSIZE; + if (!e_iter + || c_pos >= e_iter->startbit + EBITMAP_SIZE) { + e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC); + if (!e_iter) + goto netlbl_import_failure; + e_iter->startbit + = c_pos - (c_pos % EBITMAP_SIZE); + if (emap_prev == NULL) + ebmap->node = e_iter; + else + emap_prev->next = e_iter; + emap_prev = e_iter; + } + delta = c_pos - e_iter->startbit; + e_idx = delta / EBITMAP_UNIT_SIZE; + e_sft = delta % EBITMAP_UNIT_SIZE; + while (map) { + e_iter->maps[e_idx++] |= map & (-1UL); + map >>= EBITMAP_UNIT_SIZE; + } } c_iter = c_iter->next; } while (c_iter != NULL); if (e_iter != NULL) - ebmap->highbit = e_iter->startbit + MAPSIZE; + ebmap->highbit = e_iter->startbit + EBITMAP_SIZE; else ebitmap_destroy(ebmap); @@ -186,6 +214,7 @@ netlbl_import_failure: int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2) { struct ebitmap_node *n1, *n2; + int i; if (e1->highbit < e2->highbit) return 0; @@ -197,8 +226,10 @@ int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2) n1 = n1->next; continue; } - if ((n1->map & n2->map) != n2->map) - return 0; + for (i = 0; i < EBITMAP_UNIT_NUMS; i++) { + if ((n1->maps[i] & n2->maps[i]) != n2->maps[i]) + return 0; + } n1 = n1->next; n2 = n2->next; @@ -219,12 +250,8 @@ int ebitmap_get_bit(struct ebitmap *e, unsigned long bit) n = e->node; while (n && (n->startbit <= bit)) { - if ((n->startbit + MAPSIZE) > bit) { - if (n->map & (MAPBIT << (bit - n->startbit))) - return 1; - else - return 0; - } + if ((n->startbit + EBITMAP_SIZE) > bit) + return ebitmap_node_get_bit(n, bit); n = n->next; } @@ -238,31 +265,35 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value) prev = NULL; n = e->node; while (n && n->startbit <= bit) { - if ((n->startbit + MAPSIZE) > bit) { + if ((n->startbit + EBITMAP_SIZE) > bit) { if (value) { - n->map |= (MAPBIT << (bit - n->startbit)); + ebitmap_node_set_bit(n, bit); } else { - n->map &= ~(MAPBIT << (bit - n->startbit)); - if (!n->map) { - /* drop this node from the bitmap */ - - if (!n->next) { - /* - * this was the highest map - * within the bitmap - */ - if (prev) - e->highbit = prev->startbit + MAPSIZE; - else - e->highbit = 0; - } + unsigned int s; + + ebitmap_node_clr_bit(n, bit); + + s = find_first_bit(n->maps, EBITMAP_SIZE); + if (s < EBITMAP_SIZE) + return 0; + + /* drop this node from the bitmap */ + if (!n->next) { + /* + * this was the highest map + * within the bitmap + */ if (prev) - prev->next = n->next; + e->highbit = prev->startbit + + EBITMAP_SIZE; else - e->node = n->next; - - kfree(n); + e->highbit = 0; } + if (prev) + prev->next = n->next; + else + e->node = n->next; + kfree(n); } return 0; } @@ -277,12 +308,12 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value) if (!new) return -ENOMEM; - new->startbit = bit & ~(MAPSIZE - 1); - new->map = (MAPBIT << (bit - new->startbit)); + new->startbit = bit - (bit % EBITMAP_SIZE); + ebitmap_node_set_bit(new, bit); if (!n) /* this node will be the highest map within the bitmap */ - e->highbit = new->startbit + MAPSIZE; + e->highbit = new->startbit + EBITMAP_SIZE; if (prev) { new->next = prev->next; @@ -316,11 +347,11 @@ void ebitmap_destroy(struct ebitmap *e) int ebitmap_read(struct ebitmap *e, void *fp) { - int rc; - struct ebitmap_node *n, *l; + struct ebitmap_node *n = NULL; + u32 mapunit, count, startbit, index; + u64 map; __le32 buf[3]; - u32 mapsize, count, i; - __le64 map; + int rc, i; ebitmap_init(e); @@ -328,85 +359,89 @@ int ebitmap_read(struct ebitmap *e, void *fp) if (rc < 0) goto out; - mapsize = le32_to_cpu(buf[0]); + mapunit = le32_to_cpu(buf[0]); e->highbit = le32_to_cpu(buf[1]); count = le32_to_cpu(buf[2]); - if (mapsize != MAPSIZE) { + if (mapunit != sizeof(u64) * 8) { printk(KERN_ERR "security: ebitmap: map size %u does not " - "match my size %Zd (high bit was %d)\n", mapsize, - MAPSIZE, e->highbit); + "match my size %Zd (high bit was %d)\n", + mapunit, sizeof(u64) * 8, e->highbit); goto bad; } + + /* round up e->highbit */ + e->highbit += EBITMAP_SIZE - 1; + e->highbit -= (e->highbit % EBITMAP_SIZE); + if (!e->highbit) { e->node = NULL; goto ok; } - if (e->highbit & (MAPSIZE - 1)) { - printk(KERN_ERR "security: ebitmap: high bit (%d) is not a " - "multiple of the map size (%Zd)\n", e->highbit, MAPSIZE); - goto bad; - } - l = NULL; + for (i = 0; i < count; i++) { - rc = next_entry(buf, fp, sizeof(u32)); + rc = next_entry(&startbit, fp, sizeof(u32)); if (rc < 0) { printk(KERN_ERR "security: ebitmap: truncated map\n"); goto bad; } - n = kzalloc(sizeof(*n), GFP_KERNEL); - if (!n) { - printk(KERN_ERR "security: ebitmap: out of memory\n"); - rc = -ENOMEM; - goto bad; - } - - n->startbit = le32_to_cpu(buf[0]); + startbit = le32_to_cpu(startbit); - if (n->startbit & (MAPSIZE - 1)) { + if (startbit & (mapunit - 1)) { printk(KERN_ERR "security: ebitmap start bit (%d) is " - "not a multiple of the map size (%Zd)\n", - n->startbit, MAPSIZE); - goto bad_free; + "not a multiple of the map unit size (%Zd)\n", + startbit, mapunit); + goto bad; } - if (n->startbit > (e->highbit - MAPSIZE)) { + if (startbit > e->highbit - mapunit) { printk(KERN_ERR "security: ebitmap start bit (%d) is " "beyond the end of the bitmap (%Zd)\n", - n->startbit, (e->highbit - MAPSIZE)); - goto bad_free; + startbit, (e->highbit - mapunit)); + goto bad; + } + + if (!n || startbit >= n->startbit + EBITMAP_SIZE) { + struct ebitmap_node *tmp; + tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); + if (!tmp) { + printk(KERN_ERR + "security: ebitmap: out of memory\n"); + rc = -ENOMEM; + goto bad; + } + /* round down */ + tmp->startbit = startbit - (startbit % EBITMAP_SIZE); + if (n) { + n->next = tmp; + } else { + e->node = tmp; + } + n = tmp; + } else if (startbit <= n->startbit) { + printk(KERN_ERR "security: ebitmap: start bit %d" + " comes after start bit %d\n", + startbit, n->startbit); + goto bad; } + rc = next_entry(&map, fp, sizeof(u64)); if (rc < 0) { printk(KERN_ERR "security: ebitmap: truncated map\n"); - goto bad_free; + goto bad; } - n->map = le64_to_cpu(map); + map = le64_to_cpu(map); - if (!n->map) { - printk(KERN_ERR "security: ebitmap: null map in " - "ebitmap (startbit %d)\n", n->startbit); - goto bad_free; + index = (startbit - n->startbit) / EBITMAP_UNIT_SIZE; + while (map) { + n->maps[index] = map & (-1UL); + map = map >> EBITMAP_UNIT_SIZE; + index++; } - if (l) { - if (n->startbit <= l->startbit) { - printk(KERN_ERR "security: ebitmap: start " - "bit %d comes after start bit %d\n", - n->startbit, l->startbit); - goto bad_free; - } - l->next = n; - } else - e->node = n; - - l = n; } - ok: rc = 0; out: return rc; -bad_free: - kfree(n); bad: if (!rc) rc = -EINVAL; diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h index 1270e34..e38a327 100644 --- a/security/selinux/ss/ebitmap.h +++ b/security/selinux/ss/ebitmap.h @@ -16,14 +16,16 @@ #include <net/netlabel.h> -#define MAPTYPE u64 /* portion of bitmap in each node */ -#define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ -#define MAPBIT 1ULL /* a bit in the node bitmap */ +#define EBITMAP_UNIT_NUMS ((32 - sizeof(void *) - sizeof(u32)) \ + / sizeof(unsigned long)) +#define EBITMAP_UNIT_SIZE BITS_PER_LONG +#define EBITMAP_SIZE (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE) +#define EBITMAP_BIT 1ULL struct ebitmap_node { - u32 startbit; /* starting position in the total bitmap */ - MAPTYPE map; /* this node's portion of the bitmap */ struct ebitmap_node *next; + unsigned long maps[EBITMAP_UNIT_NUMS]; + u32 startbit; }; struct ebitmap { @@ -34,11 +36,17 @@ struct ebitmap { #define ebitmap_length(e) ((e)->highbit) #define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0) -static inline unsigned int ebitmap_start(struct ebitmap *e, - struct ebitmap_node **n) +static inline unsigned int ebitmap_start_positive(struct ebitmap *e, + struct ebitmap_node **n) { - *n = e->node; - return ebitmap_startbit(e); + unsigned int ofs; + + for (*n = e->node; *n; *n = (*n)->next) { + ofs = find_first_bit((*n)->maps, EBITMAP_SIZE); + if (ofs < EBITMAP_SIZE) + return (*n)->startbit + ofs; + } + return ebitmap_length(e); } static inline void ebitmap_init(struct ebitmap *e) @@ -46,28 +54,65 @@ static inline void ebitmap_init(struct ebitmap *e) memset(e, 0, sizeof(*e)); } -static inline unsigned int ebitmap_next(struct ebitmap_node **n, - unsigned int bit) +static inline unsigned int ebitmap_next_positive(struct ebitmap *e, + struct ebitmap_node **n, + unsigned int bit) { - if ((bit == ((*n)->startbit + MAPSIZE - 1)) && - (*n)->next) { - *n = (*n)->next; - return (*n)->startbit; - } + unsigned int ofs; + + ofs = find_next_bit((*n)->maps, EBITMAP_SIZE, bit - (*n)->startbit + 1); + if (ofs < EBITMAP_SIZE) + return ofs + (*n)->startbit; - return (bit+1); + for (*n = (*n)->next; *n; *n = (*n)->next) { + ofs = find_first_bit((*n)->maps, EBITMAP_SIZE); + if (ofs < EBITMAP_SIZE) + return ofs + (*n)->startbit; + } + return ebitmap_length(e); } -static inline int ebitmap_node_get_bit(struct ebitmap_node * n, +#define EBITMAP_NODE_INDEX(node, bit) \ + (((bit) - (node)->startbit) / EBITMAP_UNIT_SIZE) +#define EBITMAP_NODE_OFFSET(node, bit) \ + (((bit) - (node)->startbit) % EBITMAP_UNIT_SIZE) + +static inline int ebitmap_node_get_bit(struct ebitmap_node *n, unsigned int bit) { - if (n->map & (MAPBIT << (bit - n->startbit))) + unsigned int index = EBITMAP_NODE_INDEX(n, bit); + unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit); + + BUG_ON(index >= EBITMAP_UNIT_NUMS); + if ((n->maps[index] & (EBITMAP_BIT << ofs))) return 1; return 0; } -#define ebitmap_for_each_bit(e, n, bit) \ - for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \ +static inline void ebitmap_node_set_bit(struct ebitmap_node *n, + unsigned int bit) +{ + unsigned int index = EBITMAP_NODE_INDEX(n, bit); + unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit); + + BUG_ON(index >= EBITMAP_UNIT_NUMS); + n->maps[index] |= (EBITMAP_BIT << ofs); +} + +static inline void ebitmap_node_clr_bit(struct ebitmap_node *n, + unsigned int bit) +{ + unsigned int index = EBITMAP_NODE_INDEX(n, bit); + unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit); + + BUG_ON(index >= EBITMAP_UNIT_NUMS); + n->maps[index] &= ~(EBITMAP_BIT << ofs); +} + +#define ebitmap_for_each_positive_bit(e, n, bit) \ + for (bit = ebitmap_start_positive(e, &n); \ + bit < ebitmap_length(e); \ + bit = ebitmap_next_positive(e, &n, bit)) \ int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2); int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src); diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index 4a8bab2..9a11dea 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -34,7 +34,9 @@ */ int mls_compute_context_len(struct context * context) { - int i, l, len, range; + int i, l, len, head, prev; + char *nm; + struct ebitmap *e; struct ebitmap_node *node; if (!selinux_mls_enabled) @@ -42,31 +44,33 @@ int mls_compute_context_len(struct context * context) len = 1; /* for the beginning ":" */ for (l = 0; l < 2; l++) { - range = 0; - len += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); - - ebitmap_for_each_bit(&context->range.level[l].cat, node, i) { - if (ebitmap_node_get_bit(node, i)) { - if (range) { - range++; - continue; - } + int index_sens = context->range.level[l].sens; + len += strlen(policydb.p_sens_val_to_name[index_sens - 1]); - len += strlen(policydb.p_cat_val_to_name[i]) + 1; - range++; - } else { - if (range > 1) - len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1; - range = 0; + /* categories */ + head = -2; + prev = -2; + e = &context->range.level[l].cat; + ebitmap_for_each_positive_bit(e, node, i) { + if (i - prev > 1) { + /* one or more negative bits are skipped */ + if (head != prev) { + nm = policydb.p_cat_val_to_name[prev]; + len += strlen(nm) + 1; + } + nm = policydb.p_cat_val_to_name[i]; + len += strlen(nm) + 1; + head = i; } + prev = i; + } + if (prev != head) { + nm = policydb.p_cat_val_to_name[prev]; + len += strlen(nm) + 1; } - /* Handle case where last category is the end of range */ - if (range > 1) - len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1; - if (l == 0) { if (mls_level_eq(&context->range.level[0], - &context->range.level[1])) + &context->range.level[1])) break; else len++; @@ -84,8 +88,9 @@ int mls_compute_context_len(struct context * context) void mls_sid_to_context(struct context *context, char **scontext) { - char *scontextp; - int i, l, range, wrote_sep; + char *scontextp, *nm; + int i, l, head, prev; + struct ebitmap *e; struct ebitmap_node *node; if (!selinux_mls_enabled) @@ -97,61 +102,54 @@ void mls_sid_to_context(struct context *context, scontextp++; for (l = 0; l < 2; l++) { - range = 0; - wrote_sep = 0; strcpy(scontextp, policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); - scontextp += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]); + scontextp += strlen(scontextp); /* categories */ - ebitmap_for_each_bit(&context->range.level[l].cat, node, i) { - if (ebitmap_node_get_bit(node, i)) { - if (range) { - range++; - continue; - } - - if (!wrote_sep) { - *scontextp++ = ':'; - wrote_sep = 1; - } else - *scontextp++ = ','; - strcpy(scontextp, policydb.p_cat_val_to_name[i]); - scontextp += strlen(policydb.p_cat_val_to_name[i]); - range++; - } else { - if (range > 1) { - if (range > 2) + head = -2; + prev = -2; + e = &context->range.level[l].cat; + ebitmap_for_each_positive_bit(e, node, i) { + if (i - prev > 1) { + /* one or more negative bits are skipped */ + if (prev != head) { + if (prev - head > 1) *scontextp++ = '.'; else *scontextp++ = ','; - - strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]); - scontextp += strlen(policydb.p_cat_val_to_name[i - 1]); + nm = policydb.p_cat_val_to_name[prev]; + strcpy(scontextp, nm); + scontextp += strlen(nm); } - range = 0; + if (prev < 0) + *scontextp++ = ':'; + else + *scontextp++ = ','; + nm = policydb.p_cat_val_to_name[i]; + strcpy(scontextp, nm); + scontextp += strlen(nm); + head = i; } + prev = i; } - /* Handle case where last category is the end of range */ - if (range > 1) { - if (range > 2) + if (prev != head) { + if (prev - head > 1) *scontextp++ = '.'; else *scontextp++ = ','; - - strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]); - scontextp += strlen(policydb.p_cat_val_to_name[i - 1]); + nm = policydb.p_cat_val_to_name[prev]; + strcpy(scontextp, nm); + scontextp += strlen(nm); } if (l == 0) { if (mls_level_eq(&context->range.level[0], &context->range.level[1])) break; - else { - *scontextp = '-'; - scontextp++; - } + else + *scontextp++ = '-'; } } @@ -190,17 +188,15 @@ int mls_context_isvalid(struct policydb *p, struct context *c) if (!levdatum) return 0; - ebitmap_for_each_bit(&c->range.level[l].cat, node, i) { - if (ebitmap_node_get_bit(node, i)) { - if (i > p->p_cats.nprim) - return 0; - if (!ebitmap_get_bit(&levdatum->level->cat, i)) - /* - * Category may not be associated with - * sensitivity in low level. - */ - return 0; - } + ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) { + if (i > p->p_cats.nprim) + return 0; + if (!ebitmap_get_bit(&levdatum->level->cat, i)) + /* + * Category may not be associated with + * sensitivity in low level. + */ + return 0; } } @@ -485,18 +481,16 @@ int mls_convert_context(struct policydb *oldp, c->range.level[l].sens = levdatum->level->sens; ebitmap_init(&bitmap); - ebitmap_for_each_bit(&c->range.level[l].cat, node, i) { - if (ebitmap_node_get_bit(node, i)) { - int rc; - - catdatum = hashtab_search(newp->p_cats.table, - oldp->p_cat_val_to_name[i]); - if (!catdatum) - return -EINVAL; - rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1); - if (rc) - return rc; - } + ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) { + int rc; + + catdatum = hashtab_search(newp->p_cats.table, + oldp->p_cat_val_to_name[i]); + 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; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 03140ed..d572dc9 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -353,12 +353,8 @@ static int context_struct_compute_av(struct context *scontext, avkey.specified = AVTAB_AV; sattr = &policydb.type_attr_map[scontext->type - 1]; tattr = &policydb.type_attr_map[tcontext->type - 1]; - ebitmap_for_each_bit(sattr, snode, i) { - if (!ebitmap_node_get_bit(snode, i)) - continue; - ebitmap_for_each_bit(tattr, tnode, j) { - if (!ebitmap_node_get_bit(tnode, j)) - continue; + ebitmap_for_each_positive_bit(sattr, snode, i) { + ebitmap_for_each_positive_bit(tattr, tnode, j) { avkey.source_type = i + 1; avkey.target_type = j + 1; for (node = avtab_search_node(&policydb.te_avtab, &avkey); @@ -1668,14 +1664,10 @@ int security_get_user_sids(u32 fromsid, goto out_unlock; } - ebitmap_for_each_bit(&user->roles, rnode, i) { - if (!ebitmap_node_get_bit(rnode, i)) - continue; + ebitmap_for_each_positive_bit(&user->roles, rnode, i) { role = policydb.role_val_to_struct[i]; usercon.role = i+1; - ebitmap_for_each_bit(&role->types, tnode, j) { - if (!ebitmap_node_get_bit(tnode, j)) - continue; + ebitmap_for_each_positive_bit(&role->types, tnode, j) { usercon.type = j+1; if (mls_setup_user_range(fromcon, user, &usercon)) |