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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /security/apparmor/secid.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | security/apparmor/secid.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c new file mode 100644 index 000000000..24a0e23f1 --- /dev/null +++ b/security/apparmor/secid.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AppArmor security module + * + * This file contains AppArmor security identifier (secid) manipulation fns + * + * Copyright 2009-2017 Canonical Ltd. + * + * AppArmor allocates a unique secid for every label used. If a label + * is replaced it receives the secid of the label it is replacing. + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/gfp.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/xarray.h> + +#include "include/cred.h" +#include "include/lib.h" +#include "include/secid.h" +#include "include/label.h" +#include "include/policy_ns.h" + +/* + * secids - do not pin labels with a refcount. They rely on the label + * properly updating/freeing them + */ +#define AA_FIRST_SECID 2 + +static DEFINE_XARRAY_FLAGS(aa_secids, XA_FLAGS_LOCK_IRQ | XA_FLAGS_TRACK_FREE); + +int apparmor_display_secid_mode; + +/* + * TODO: allow policy to reserve a secid range? + * TODO: add secid pinning + * TODO: use secid_update in label replace + */ + +/** + * aa_secid_update - update a secid mapping to a new label + * @secid: secid to update + * @label: label the secid will now map to + */ +void aa_secid_update(u32 secid, struct aa_label *label) +{ + unsigned long flags; + + xa_lock_irqsave(&aa_secids, flags); + __xa_store(&aa_secids, secid, label, 0); + xa_unlock_irqrestore(&aa_secids, flags); +} + +/** + * + * see label for inverse aa_label_to_secid + */ +struct aa_label *aa_secid_to_label(u32 secid) +{ + return xa_load(&aa_secids, secid); +} + +int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +{ + /* TODO: cache secctx and ref count so we don't have to recreate */ + struct aa_label *label = aa_secid_to_label(secid); + int flags = FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT; + int len; + + AA_BUG(!seclen); + + if (!label) + return -EINVAL; + + if (apparmor_display_secid_mode) + flags |= FLAG_SHOW_MODE; + + if (secdata) + len = aa_label_asxprint(secdata, root_ns, label, + flags, GFP_ATOMIC); + else + len = aa_label_snxprint(NULL, 0, root_ns, label, flags); + + if (len < 0) + return -ENOMEM; + + *seclen = len; + + return 0; +} + +int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) +{ + struct aa_label *label; + + label = aa_label_strn_parse(&root_ns->unconfined->label, secdata, + seclen, GFP_KERNEL, false, false); + if (IS_ERR(label)) + return PTR_ERR(label); + *secid = label->secid; + + return 0; +} + +void apparmor_release_secctx(char *secdata, u32 seclen) +{ + kfree(secdata); +} + +/** + * aa_alloc_secid - allocate a new secid for a profile + * @label: the label to allocate a secid for + * @gfp: memory allocation flags + * + * Returns: 0 with @label->secid initialized + * <0 returns error with @label->secid set to AA_SECID_INVALID + */ +int aa_alloc_secid(struct aa_label *label, gfp_t gfp) +{ + unsigned long flags; + int ret; + + xa_lock_irqsave(&aa_secids, flags); + ret = __xa_alloc(&aa_secids, &label->secid, label, + XA_LIMIT(AA_FIRST_SECID, INT_MAX), gfp); + xa_unlock_irqrestore(&aa_secids, flags); + + if (ret < 0) { + label->secid = AA_SECID_INVALID; + return ret; + } + + return 0; +} + +/** + * aa_free_secid - free a secid + * @secid: secid to free + */ +void aa_free_secid(u32 secid) +{ + unsigned long flags; + + xa_lock_irqsave(&aa_secids, flags); + __xa_erase(&aa_secids, secid); + xa_unlock_irqrestore(&aa_secids, flags); +} |