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kernel: add close_fd helper, debloat dmesg log

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Signed-off-by: fc5b87cf <rissu.ntk@gmail.com>
This commit is contained in:
fc5b87cf
2025-11-17 21:44:24 +07:00
committed by ShirkNeko
parent 6e44090e57
commit 83db28b262
6 changed files with 21 additions and 28 deletions
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18
kernel/supercalls.c
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@@ -669,11 +669,7 @@ static void ksu_install_fd_tw_func(struct callback_head *cb)
if (copy_to_user(tw->outp, &fd, sizeof(fd))) {
pr_err("install ksu fd reply err\n");
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
close_fd(fd);
#else
ksys_close(fd);
#endif
do_close_fd(fd);
}
kfree(tw);
@@ -699,7 +695,7 @@ static int reboot_handler_pre(struct kprobe *p, struct pt_regs *regs)
tw->outp = (int __user *)arg4;
tw->cb.func = ksu_install_fd_tw_func;
if (ksu_task_work_add(current, &tw->cb, TWA_RESUME)) {
if (task_work_add(current, &tw->cb, TWA_RESUME)) {
kfree(tw);
pr_warn("install fd add task_work failed\n");
}
@@ -730,13 +726,7 @@ int ksu_handle_sys_reboot(int magic1, int magic2, unsigned int cmd,
// downstream: dereference all arg usage!
if (copy_to_user((void __user *)*arg, &fd, sizeof(fd))) {
pr_err("install ksu fd reply err\n");
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
close_fd(fd);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
ksys_close(fd);
#else
sys_close(fd);
#endif
do_close_fd(fd);
}
return 0;
}
@@ -842,8 +832,10 @@ int ksu_install_fd(void)
// Install fd
fd_install(fd, filp);
#ifdef CONFIG_KSU_DEBUG
pr_info("ksu fd[%d] installed for %s/%d\n", fd, current->comm,
current->pid);
#endif
return fd;
}