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crypto/luks: Support creating LUKS image on Darwin

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When the user creates a LUKS-encrypted qcow2 image using the qemu-img
program, the passphrase is hashed using PBKDF2 with a dynamic
number of iterations. The number of iterations is determined by
measuring thread cpu time usage, such that it takes approximately
2 seconds to compute the hash.

Because Darwin doesn't implement getrusage(RUSAGE_THREAD), we get an
error message:
> qemu-img: test.qcow2: Unable to calculate thread CPU usage on this platform
for this command:
> qemu-img create --object secret,id=key,data=1234 -f qcow2 -o 'encrypt.format=luks,encrypt.key-secret=key' test.qcow2 100M

This patch implements qcrypto_pbkdf2_get_thread_cpu() for Darwin so that
the above command works.

Signed-off-by: Jungmin Park <pjm0616@gmail.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Jungmin Park 2022-08-24 21:37:06 +09:00 committed by Daniel P. Berrangé
parent e750a7ace4
commit bf98afc75e
1 changed files with 23 additions and 0 deletions
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23
crypto/pbkdf.c
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@ -24,6 +24,11 @@
#ifndef _WIN32
#include <sys/resource.h>
#endif
#ifdef CONFIG_DARWIN
#include <mach/mach_init.h>
#include <mach/thread_act.h>
#include <mach/mach_port.h>
#endif
static int qcrypto_pbkdf2_get_thread_cpu(unsigned long long *val_ms,
@ -45,6 +50,24 @@ static int qcrypto_pbkdf2_get_thread_cpu(unsigned long long *val_ms,
/* QuadPart is units of 100ns and we want ms as unit */
*val_ms = thread_time.QuadPart / 10000ll;
return 0;
#elif defined(CONFIG_DARWIN)
mach_port_t thread;
kern_return_t kr;
mach_msg_type_number_t count;
thread_basic_info_data_t info;
thread = mach_thread_self();
count = THREAD_BASIC_INFO_COUNT;
kr = thread_info(thread, THREAD_BASIC_INFO, (thread_info_t)&info, &count);
mach_port_deallocate(mach_task_self(), thread);
if (kr != KERN_SUCCESS || (info.flags & TH_FLAGS_IDLE) != 0) {
error_setg_errno(errp, errno, "Unable to get thread CPU usage");
return -1;
}
*val_ms = ((info.user_time.seconds * 1000ll) +
(info.user_time.microseconds / 1000));
return 0;
#elif defined(RUSAGE_THREAD)
struct rusage ru;
if (getrusage(RUSAGE_THREAD, &ru) < 0) {