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lsm: rework the LSM enable/disable setter/getter functions

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In addition to style changes, rename set_enabled() to lsm_enabled_set()
and is_enabled() to lsm_is_enabled() to better fit within the LSM
initialization code.

Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: John Johansen <john.johhansen@canonical.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore
2025-04-10 22:04:26 -04:00
parent 935d508d4d
commit 2d67172612
1 changed files with 31 additions and 31 deletions
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62
security/lsm_init.c
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@@ -10,6 +10,10 @@
#include "lsm.h"
/* LSM enabled constants. */
static __initdata int lsm_enabled_true = 1;
static __initdata int lsm_enabled_false = 0;
/* Pointers to LSM sections defined in include/asm-generic/vmlinux.lds.h */
extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[];
@@ -75,37 +79,33 @@ static int __init lsm_debug_enable(char *str)
}
__setup("lsm.debug", lsm_debug_enable);
/* Mark an LSM's enabled flag. */
static int lsm_enabled_true __initdata = 1;
static int lsm_enabled_false __initdata = 0;
static void __init set_enabled(struct lsm_info *lsm, bool enabled)
/**
* lsm_enabled_set - Mark a LSM as enabled
* @lsm: LSM definition
* @enabled: enabled flag
*/
static void __init lsm_enabled_set(struct lsm_info *lsm, bool enabled)
{
/*
* When an LSM hasn't configured an enable variable, we can use
* a hard-coded location for storing the default enabled state.
*/
if (!lsm->enabled) {
if (enabled)
lsm->enabled = &lsm_enabled_true;
else
lsm->enabled = &lsm_enabled_false;
} else if (lsm->enabled == &lsm_enabled_true) {
if (!enabled)
lsm->enabled = &lsm_enabled_false;
} else if (lsm->enabled == &lsm_enabled_false) {
if (enabled)
lsm->enabled = &lsm_enabled_true;
if (!lsm->enabled ||
lsm->enabled == &lsm_enabled_true ||
lsm->enabled == &lsm_enabled_false) {
lsm->enabled = enabled ? &lsm_enabled_true : &lsm_enabled_false;
} else {
*lsm->enabled = enabled;
}
}
static inline bool is_enabled(struct lsm_info *lsm)
/**
* lsm_is_enabled - Determine if a LSM is enabled
* @lsm: LSM definition
*/
static inline bool lsm_is_enabled(struct lsm_info *lsm)
{
if (!lsm->enabled)
return false;
return *lsm->enabled;
return (lsm->enabled ? *lsm->enabled : false);
}
/* Is an LSM already listed in the ordered LSMs list? */
@@ -139,7 +139,7 @@ static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
lsm_idlist[last_lsm++] = lsm->id;
init_debug("%s ordered: %s (%s)\n", from, lsm->id->name,
is_enabled(lsm) ? "enabled" : "disabled");
lsm_is_enabled(lsm) ? "enabled" : "disabled");
}
static void __init lsm_set_blob_size(int *need, int *lbs)
@@ -162,17 +162,17 @@ static void __init lsm_prepare(struct lsm_info *lsm)
{
struct lsm_blob_sizes *blobs;
if (!is_enabled(lsm)) {
set_enabled(lsm, false);
if (!lsm_is_enabled(lsm)) {
lsm_enabled_set(lsm, false);
return;
} else if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && lsm_exclusive) {
init_debug("exclusive disabled: %s\n", lsm->id->name);
set_enabled(lsm, false);
lsm_enabled_set(lsm, false);
return;
}
/* Mark the LSM as enabled. */
set_enabled(lsm, true);
lsm_enabled_set(lsm, true);
if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !lsm_exclusive) {
init_debug("exclusive chosen: %s\n", lsm->id->name);
lsm_exclusive = lsm;
@@ -206,7 +206,7 @@ static void __init lsm_prepare(struct lsm_info *lsm)
/* Initialize a given LSM, if it is enabled. */
static void __init initialize_lsm(struct lsm_info *lsm)
{
if (is_enabled(lsm)) {
if (lsm_is_enabled(lsm)) {
int ret;
init_debug("initializing %s\n", lsm->id->name);
@@ -240,7 +240,7 @@ static void __init ordered_lsm_parse(const char *order, const char *origin)
lsm_for_each_raw(major) {
if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
strcmp(major->id->name, lsm_order_legacy) != 0) {
set_enabled(major, false);
lsm_enabled_set(major, false);
init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
lsm_order_legacy, major->id->name);
}
@@ -286,7 +286,7 @@ static void __init ordered_lsm_parse(const char *order, const char *origin)
lsm_for_each_raw(lsm) {
if (exists_ordered_lsm(lsm))
continue;
set_enabled(lsm, false);
lsm_enabled_set(lsm, false);
init_debug("%s skipped: %s (not in requested order)\n",
origin, lsm->id->name);
}
@@ -319,12 +319,12 @@ static void __init lsm_init_ordered(void)
pr_info("initializing lsm=");
lsm_early_for_each_raw(early) {
if (is_enabled(early))
if (lsm_is_enabled(early))
pr_cont("%s%s",
first++ == 0 ? "" : ",", early->id->name);
}
lsm_order_for_each(lsm) {
if (is_enabled(*lsm))
if (lsm_is_enabled(*lsm))
pr_cont("%s%s",
first++ == 0 ? "" : ",", (*lsm)->id->name);
}
@@ -440,7 +440,7 @@ int __init security_init(void)
*/
lsm_early_for_each_raw(lsm) {
init_debug(" early started: %s (%s)\n", lsm->id->name,
is_enabled(lsm) ? "enabled" : "disabled");
lsm_is_enabled(lsm) ? "enabled" : "disabled");
}
/* Load LSMs in specified order. */