From b750101eb236130cf056c675997decbac904cc49 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:35:18 +0200 Subject: Adding upstream version 252.22. Signed-off-by: Daniel Baumann --- src/shared/keyring-util.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 src/shared/keyring-util.c (limited to 'src/shared/keyring-util.c') 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; + } +} -- cgit v1.2.3