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Diffstat (limited to 'kernel/groups.c')
-rw-r--r--kernel/groups.c67
1 files changed, 21 insertions, 46 deletions
diff --git a/kernel/groups.c b/kernel/groups.c
index 74d431d25251..2fcadd66a8fd 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -7,55 +7,31 @@
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/user_namespace.h>
+#include <linux/vmalloc.h>
#include <asm/uaccess.h>
struct group_info *groups_alloc(int gidsetsize)
{
- struct group_info *group_info;
- int nblocks;
- int i;
-
- nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;
- /* Make sure we always allocate at least one indirect block pointer */
- nblocks = nblocks ? : 1;
- group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);
- if (!group_info)
+ struct group_info *gi;
+ unsigned int len;
+
+ len = sizeof(struct group_info) + sizeof(kgid_t) * gidsetsize;
+ gi = kmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY);
+ if (!gi)
+ gi = __vmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM, PAGE_KERNEL);
+ if (!gi)
return NULL;
- group_info->ngroups = gidsetsize;
- group_info->nblocks = nblocks;
- atomic_set(&group_info->usage, 1);
-
- if (gidsetsize <= NGROUPS_SMALL)
- group_info->blocks[0] = group_info->small_block;
- else {
- for (i = 0; i < nblocks; i++) {
- kgid_t *b;
- b = (void *)__get_free_page(GFP_USER);
- if (!b)
- goto out_undo_partial_alloc;
- group_info->blocks[i] = b;
- }
- }
- return group_info;
-out_undo_partial_alloc:
- while (--i >= 0) {
- free_page((unsigned long)group_info->blocks[i]);
- }
- kfree(group_info);
- return NULL;
+ atomic_set(&gi->usage, 1);
+ gi->ngroups = gidsetsize;
+ return gi;
}
EXPORT_SYMBOL(groups_alloc);
void groups_free(struct group_info *group_info)
{
- if (group_info->blocks[0] != group_info->small_block) {
- int i;
- for (i = 0; i < group_info->nblocks; i++)
- free_page((unsigned long)group_info->blocks[i]);
- }
- kfree(group_info);
+ kvfree(group_info);
}
EXPORT_SYMBOL(groups_free);
@@ -70,7 +46,7 @@ static int groups_to_user(gid_t __user *grouplist,
for (i = 0; i < count; i++) {
gid_t gid;
- gid = from_kgid_munged(user_ns, GROUP_AT(group_info, i));
+ gid = from_kgid_munged(user_ns, group_info->gid[i]);
if (put_user(gid, grouplist+i))
return -EFAULT;
}
@@ -95,7 +71,7 @@ static int groups_from_user(struct group_info *group_info,
if (!gid_valid(kgid))
return -EINVAL;
- GROUP_AT(group_info, i) = kgid;
+ group_info->gid[i] = kgid;
}
return 0;
}
@@ -115,15 +91,14 @@ static void groups_sort(struct group_info *group_info)
for (base = 0; base < max; base++) {
int left = base;
int right = left + stride;
- kgid_t tmp = GROUP_AT(group_info, right);
+ kgid_t tmp = group_info->gid[right];
- while (left >= 0 && gid_gt(GROUP_AT(group_info, left), tmp)) {
- GROUP_AT(group_info, right) =
- GROUP_AT(group_info, left);
+ while (left >= 0 && gid_gt(group_info->gid[left], tmp)) {
+ group_info->gid[right] = group_info->gid[left];
right = left;
left -= stride;
}
- GROUP_AT(group_info, right) = tmp;
+ group_info->gid[right] = tmp;
}
stride /= 3;
}
@@ -141,9 +116,9 @@ int groups_search(const struct group_info *group_info, kgid_t grp)
right = group_info->ngroups;
while (left < right) {
unsigned int mid = (left+right)/2;
- if (gid_gt(grp, GROUP_AT(group_info, mid)))
+ if (gid_gt(grp, group_info->gid[mid]))
left = mid + 1;
- else if (gid_lt(grp, GROUP_AT(group_info, mid)))
+ else if (gid_lt(grp, group_info->gid[mid]))
right = mid;
else
return 1;

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