From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/kcmp.c | 30 +++++++++++++++---------------
1 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/kernel/kernel/kcmp.c b/kernel/kernel/kcmp.c
index a0e3d7a..c0d2ad9 100644
--- a/kernel/kernel/kcmp.c
+++ b/kernel/kernel/kcmp.c
@@ -75,25 +75,25 @@
return file;
}
-static void kcmp_unlock(struct mutex *m1, struct mutex *m2)
+static void kcmp_unlock(struct rw_semaphore *l1, struct rw_semaphore *l2)
{
- if (likely(m2 != m1))
- mutex_unlock(m2);
- mutex_unlock(m1);
+ if (likely(l2 != l1))
+ up_read(l2);
+ up_read(l1);
}
-static int kcmp_lock(struct mutex *m1, struct mutex *m2)
+static int kcmp_lock(struct rw_semaphore *l1, struct rw_semaphore *l2)
{
int err;
- if (m2 > m1)
- swap(m1, m2);
+ if (l2 > l1)
+ swap(l1, l2);
- err = mutex_lock_killable(m1);
- if (!err && likely(m1 != m2)) {
- err = mutex_lock_killable_nested(m2, SINGLE_DEPTH_NESTING);
+ err = down_read_killable(l1);
+ if (!err && likely(l1 != l2)) {
+ err = down_read_killable_nested(l2, SINGLE_DEPTH_NESTING);
if (err)
- mutex_unlock(m1);
+ up_read(l1);
}
return err;
@@ -173,8 +173,8 @@
/*
* One should have enough rights to inspect task details.
*/
- ret = kcmp_lock(&task1->signal->cred_guard_mutex,
- &task2->signal->cred_guard_mutex);
+ ret = kcmp_lock(&task1->signal->exec_update_lock,
+ &task2->signal->exec_update_lock);
if (ret)
goto err;
if (!ptrace_may_access(task1, PTRACE_MODE_READ_REALCREDS) ||
@@ -229,8 +229,8 @@
}
err_unlock:
- kcmp_unlock(&task1->signal->cred_guard_mutex,
- &task2->signal->cred_guard_mutex);
+ kcmp_unlock(&task1->signal->exec_update_lock,
+ &task2->signal->exec_update_lock);
err:
put_task_struct(task1);
put_task_struct(task2);
--
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