linux-kernel - [PATCH 01/18] ptrace: export ptrace_may

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Message-Id: <20241001144306.1991001-2-mika.kuoppala@linux.intel.com>
Date: Tue,  1 Oct 2024 17:42:49 +0300
From: Mika Kuoppala <mika.kuoppala@...ux.intel.com>
To: intel-xe@...ts.freedesktop.org
Cc: Mika Kuoppala <mika.kuoppala@...ux.intel.com>,
	Oleg Nesterov <oleg@...hat.com>,
	linux-kernel@...r.kernel.org,
	Dave Airlie <airlied@...hat.com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Andi Shyti <andi.shyti@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Maciej Patelczyk <maciej.patelczyk@...ux.intel.com>,
	Dominik Grzegorzek <dominik.grzegorzek@...el.com>,
	Jonathan Cavitt <jonathan.cavitt@...el.com>,
	Andi Shyti <andi.shyti@...ux.intel.com>
Subject: [PATCH 01/18] ptrace: export ptrace_may_access

xe driver would like to allow fine grained access control
for GDB debugger using ptrace. Without this export, the only
option would be to check for CAP_SYS_ADMIN.

The check intended for an ioctl to attach a GPU debugger
is similar to the ptrace use case: allow a calling process
to manipulate a target process if it has the necessary
capabilities or the same permissions, as described in
Documentation/process/adding-syscalls.rst.

Export ptrace_may_access function to allow GPU debugger to
have identical access control for debugger(s)
as a CPU debugger.

v2: proper commit message (Lucas)

Cc: Oleg Nesterov <oleg@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: Dave Airlie <airlied@...hat.com>
CC: Lucas De Marchi <lucas.demarchi@...el.com>
Cc: Matthew Brost <matthew.brost@...el.com>
CC: Andi Shyti <andi.shyti@...el.com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
CC: Maciej Patelczyk <maciej.patelczyk@...ux.intel.com>
Cc: Dominik Grzegorzek <dominik.grzegorzek@...el.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@...ux.intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@...el.com>
Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>
---
 kernel/ptrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index d5f89f9ef29f..86be1805ebd8 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -354,6 +354,7 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 	task_unlock(task);
 	return !err;
 }
+EXPORT_SYMBOL_GPL(ptrace_may_access);
 
 static int check_ptrace_options(unsigned long data)
 {
-- 
2.34.1