cregit-Linux how code gets into the kernel

Release 4.10 security/apparmor/capability.c

/*
 * AppArmor security module
 *
 * This file contains AppArmor capability mediation functions
 *
 * Copyright (C) 1998-2008 Novell/SUSE
 * Copyright 2009-2010 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/gfp.h>

#include "include/apparmor.h"
#include "include/capability.h"
#include "include/context.h"
#include "include/policy.h"
#include "include/audit.h"

/*
 * Table of capability names: we generate it from capabilities.h.
 */
#include "capability_names.h"


struct aa_fs_entry aa_fs_entry_caps[] = {
	AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
	{ }
};


struct audit_cache {
	
struct aa_profile *profile;
	
kernel_cap_t caps;
};

static DEFINE_PER_CPU(struct audit_cache, audit_cache);

/**
 * audit_cb - call back for capability components of audit struct
 * @ab - audit buffer   (NOT NULL)
 * @va - audit struct to audit data from  (NOT NULL)
 */

static void audit_cb(struct audit_buffer *ab, void *va) { struct common_audit_data *sa = va; audit_log_format(ab, " capname="); audit_log_untrustedstring(ab, capability_names[sa->u.cap]); }

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john johansenjohn johansen43100.00%1100.00%
Total43100.00%1100.00%

/** * audit_caps - audit a capability * @profile: profile being tested for confinement (NOT NULL) * @cap: capability tested * @error: error code returned by test * * Do auditing of capability and handle, audit/complain/kill modes switching * and duplicate message elimination. * * Returns: 0 or sa->error on success, error code on failure */
static int audit_caps(struct aa_profile *profile, int cap, int error) { struct audit_cache *ent; int type = AUDIT_APPARMOR_AUTO; struct common_audit_data sa; struct apparmor_audit_data aad = {0,}; sa.type = LSM_AUDIT_DATA_CAP; sa.aad = &aad; sa.u.cap = cap; sa.aad->op = OP_CAPABLE; sa.aad->error = error; if (likely(!error)) { /* test if auditing is being forced */ if (likely((AUDIT_MODE(profile) != AUDIT_ALL) && !cap_raised(profile->caps.audit, cap))) return 0; type = AUDIT_APPARMOR_AUDIT; } else if (KILL_MODE(profile) || cap_raised(profile->caps.kill, cap)) { type = AUDIT_APPARMOR_KILL; } else if (cap_raised(profile->caps.quiet, cap) && AUDIT_MODE(profile) != AUDIT_NOQUIET && AUDIT_MODE(profile) != AUDIT_ALL) { /* quiet auditing */ return error; } /* Do simple duplicate message elimination */ ent = &get_cpu_var(audit_cache); if (profile == ent->profile && cap_raised(ent->caps, cap)) { put_cpu_var(audit_cache); if (COMPLAIN_MODE(profile)) return complain_error(error); return error; } else { aa_put_profile(ent->profile); ent->profile = aa_get_profile(profile); cap_raise(ent->caps, cap); } put_cpu_var(audit_cache); return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb); }

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john johansenjohn johansen25592.39%125.00%
eric pariseric paris217.61%375.00%
Total276100.00%4100.00%

/** * profile_capable - test if profile allows use of capability @cap * @profile: profile being enforced (NOT NULL, NOT unconfined) * @cap: capability to test if allowed * * Returns: 0 if allowed else -EPERM */
static int profile_capable(struct aa_profile *profile, int cap) { return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM; }

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john johansenjohn johansen31100.00%1100.00%
Total31100.00%1100.00%

/** * aa_capable - test permission to use capability * @profile: profile being tested against (NOT NULL) * @cap: capability to be tested * @audit: whether an audit record should be generated * * Look up capability in profile capability set. * * Returns: 0 on success, or else an error code. */
int aa_capable(struct aa_profile *profile, int cap, int audit) { int error = profile_capable(profile, cap); if (!audit) { if (COMPLAIN_MODE(profile)) return complain_error(error); return error; } return audit_caps(profile, cap, error); }

Contributors

PersonTokensPropCommitsCommitProp
john johansenjohn johansen59100.00%1100.00%
Total59100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
john johansenjohn johansen45995.62%350.00%
eric pariseric paris214.38%350.00%
Total480100.00%6100.00%
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