From: Gregory Price <gourry.memverge@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, krisman@collabora.com,
tglx@linutronix.de, luto@kernel.org, oleg@redhat.com,
peterz@infradead.org, ebiederm@xmission.com,
akpm@linux-foundation.org, adobriyan@gmail.com, corbet@lwn.net,
shuah@kernel.org, Gregory Price <gregory.price@memverge.com>
Subject: [RFC PATCH 0/3] Checkpoint Support for Syscall User Dispatch
Date: Mon, 9 Jan 2023 10:33:45 -0500 [thread overview]
Message-ID: <20230109153348.5625-1-gregory.price@memverge.com> (raw)
Syscall user dispatch makes it possible to cleanly intercept system
calls from user-land. However, most transparent checkpoint software
presently leverages some combination of ptrace and system call
injection to place software in a ready-to-checkpoint state.
If Syscall User Dispatch is enabled at the time of being quiesced,
injected system calls will subsequently be interposed upon and
dispatched to the task's signal handler.
This patch set implements 3 features to enable software such as CRIU
to cleanly interpose upon software leveraging syscall user dispatch.
- Implement PTRACE_O_SUSPEND_SYSCALL_USER_DISPATCH, akin to a similar
feature for SECCOMP. This allows a ptracer to temporarily disable
syscall user dispatch, making syscall injection possible.
- Implement an fs/proc extension that reports whether Syscall User
Dispatch is being used in proc/status. A similar value is present
for SECCOMP, and is used to determine whether special logic is
needed during checkpoint/resume.
- Implement a getter interface for Syscall User Dispatch config info.
To resume successfully, the checkpoint/resume software has to
save and restore this information. Presently this configuration
is write-only, with no way for C/R software to save it.
Signed-off-by: Gregory Price <gregory.price@memverge.com>
Gregory Price (3):
ptrace,syscall_user_dispatch: Implement Syscall User Dispatch
Suspension
fs/proc/array: Add Syscall User Dispatch to proc status
prctl,syscall_user_dispatch: add a getter for configuration info
.../admin-guide/syscall-user-dispatch.rst | 18 +++++++
fs/proc/array.c | 8 +++
include/linux/ptrace.h | 2 +
include/linux/syscall_user_dispatch.h | 7 +++
include/uapi/linux/prctl.h | 3 ++
include/uapi/linux/ptrace.h | 6 ++-
kernel/entry/syscall_user_dispatch.c | 19 +++++++
kernel/ptrace.c | 5 ++
kernel/sys.c | 4 ++
.../syscall_user_dispatch/sud_test.c | 54 +++++++++++++++++++
10 files changed, 125 insertions(+), 1 deletion(-)
--
2.37.3
next reply other threads:[~2023-01-09 15:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-09 15:33 Gregory Price [this message]
2023-01-09 15:33 ` [PATCH 1/3] ptrace,syscall_user_dispatch: Implement Syscall User Dispatch Suspension Gregory Price
2023-01-18 17:16 ` Peter Zijlstra
[not found] ` <CAD3UvdSpOMAOUm1CYJ5vOyEsiVZCQdiWaTmXjq1vWVFq1DhQ0w@mail.gmail.com>
2023-01-18 19:49 ` Gregory Price
2023-01-18 20:40 ` Peter Zijlstra
2023-01-09 15:33 ` [PATCH 2/3] fs/proc/array: Add Syscall User Dispatch to proc status Gregory Price
2023-01-17 13:01 ` kernel test robot
2023-01-09 15:33 ` [PATCH 3/3] prctl,syscall_user_dispatch: add a getter for configuration info Gregory Price
2023-01-12 18:15 ` Andrei Vagin
2023-01-12 22:51 ` Gregory Price
2023-01-13 8:28 ` Bagas Sanjaya
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