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selinux: use mallocinfo2() if it exists

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New glibc deprecated mallocinfo(), even newer glibc added mallocinfo2()
as replacement. Use it, if it exists.

Follow-up for 4b6f74f5a0943e0abfa8e6997811f8f7b7f00a15 and related
commits.
This commit is contained in:
Lennart Poettering 2021-05-03 20:36:32 +02:00
parent 8fc1efa88f
commit 1885169c2f
2 changed files with 20 additions and 10 deletions
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1
meson.build
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@ -555,6 +555,7 @@ foreach ident : [
#include <signal.h>
#include <sys/wait.h>'''],
['mallinfo', '''#include <malloc.h>'''],
['mallinfo2', '''#include <malloc.h>'''],
['execveat', '''#include <unistd.h>'''],
['close_range', '''#include <unistd.h>'''],
['epoll_pwait2', '''#include <sys/epoll.h>'''],

29
src/basic/selinux-util.c
View File

@ -84,15 +84,24 @@ void mac_selinux_retest(void) {
}
#if HAVE_SELINUX
# if HAVE_MALLINFO
static struct mallinfo mallinfo_nowarn(void) {
/* glibc has deprecated mallinfo(), but the replacement malloc_info() returns an XML blob ;=[ */
# if HAVE_MALLINFO2
# define HAVE_GENERIC_MALLINFO 1
typedef struct mallinfo2 generic_mallinfo;
static generic_mallinfo generic_mallinfo_get(void) {
return mallinfo2();
}
# elif HAVE_MALLINFO
# define HAVE_GENERIC_MALLINFO 1
typedef struct mallinfo generic_mallinfo;
static generic_mallinfo generic_mallinfo_get(void) {
/* glibc has deprecated mallinfo(), let's suppress the deprecation warning if mallinfo2() doesn't
* exist yet. */
DISABLE_WARNING_DEPRECATED_DECLARATIONS
return mallinfo();
REENABLE_WARNING
}
# else
# warning "mallinfo() is missing, add mallinfo2() supported instead."
# define HAVE_GENERIC_MALLINFO 0
# endif
static int open_label_db(void) {
@ -100,8 +109,8 @@ static int open_label_db(void) {
usec_t before_timestamp, after_timestamp;
char timespan[FORMAT_TIMESPAN_MAX];
# if HAVE_MALLINFO
struct mallinfo before_mallinfo = mallinfo_nowarn();
# if HAVE_GENERIC_MALLINFO
generic_mallinfo before_mallinfo = generic_mallinfo_get();
# endif
before_timestamp = now(CLOCK_MONOTONIC);
@ -110,10 +119,10 @@ static int open_label_db(void) {
return log_enforcing_errno(errno, "Failed to initialize SELinux labeling handle: %m");
after_timestamp = now(CLOCK_MONOTONIC);
# if HAVE_MALLINFO
struct mallinfo after_mallinfo = mallinfo_nowarn();
int l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
# if HAVE_GENERIC_MALLINFO
generic_mallinfo after_mallinfo = generic_mallinfo_get();
size_t l = LESS_BY((size_t) after_mallinfo.uordblks, (size_t) before_mallinfo.uordblks);
log_debug("Successfully loaded SELinux database in %s, size on heap is %zuK.",
format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
DIV_ROUND_UP(l, 1024));
# else