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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
commitb750101eb236130cf056c675997decbac904cc49 (patch)
treea5df1a06754bdd014cb975c051c83b01c9a97532 /src/shared/keyring-util.c
parentInitial commit. (diff)
downloadsystemd-b750101eb236130cf056c675997decbac904cc49.tar.xz
systemd-b750101eb236130cf056c675997decbac904cc49.zip
Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/keyring-util.c')
-rw-r--r--src/shared/keyring-util.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/shared/keyring-util.c b/src/shared/keyring-util.c
new file mode 100644
index 0000000..655cf52
--- /dev/null
+++ b/src/shared/keyring-util.c
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "keyring-util.h"
+#include "memory-util.h"
+#include "missing_syscall.h"
+
+int keyring_read(key_serial_t serial, void **ret, size_t *ret_size) {
+ size_t m = 100;
+
+ for (;;) {
+ _cleanup_(erase_and_freep) uint8_t *p = NULL;
+ long n;
+
+ p = new(uint8_t, m+1);
+ if (!p)
+ return -ENOMEM;
+
+ n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0);
+ if (n < 0)
+ return -errno;
+
+ if ((size_t) n <= m) {
+ p[n] = 0; /* NUL terminate, just in case */
+
+ if (ret)
+ *ret = TAKE_PTR(p);
+ if (ret_size)
+ *ret_size = n;
+
+ return 0;
+ }
+
+ if (m > (SIZE_MAX-1) / 2) /* overflow check */
+ return -ENOMEM;
+
+ m *= 2;
+ }
+}