* [PATCH] crypto/luks: Support creating LUKS image on Darwin
@ 2022-08-24 12:37 Jungmin Park
2022-08-24 12:53 ` Daniel P. Berrangé
0 siblings, 1 reply; 2+ messages in thread
From: Jungmin Park @ 2022-08-24 12:37 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-trivial, Daniel P. Berrangé, Jungmin Park
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>
---
crypto/pbkdf.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/crypto/pbkdf.c b/crypto/pbkdf.c
index 3775ddc6c5..8d198c152c 100644
--- a/crypto/pbkdf.c
+++ b/crypto/pbkdf.c
@@ -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) {
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] crypto/luks: Support creating LUKS image on Darwin
2022-08-24 12:37 [PATCH] crypto/luks: Support creating LUKS image on Darwin Jungmin Park
@ 2022-08-24 12:53 ` Daniel P. Berrangé
0 siblings, 0 replies; 2+ messages in thread
From: Daniel P. Berrangé @ 2022-08-24 12:53 UTC (permalink / raw)
To: Jungmin Park; +Cc: qemu-devel, qemu-trivial
On Wed, Aug 24, 2022 at 09:37:06PM +0900, Jungmin Park wrote:
> 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>
> ---
> crypto/pbkdf.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Afraid this is too late to get into 7.1 release, but I'll queue it for
the next dev cycle.
With regards,
Daniel
--
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2022-08-24 12:37 [PATCH] crypto/luks: Support creating LUKS image on Darwin Jungmin Park
2022-08-24 12:53 ` Daniel P. Berrangé
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