From: Linus Torvalds <torvalds@g5.osdl.org>
Date: Sun, 21 Aug 2005 01:51:29 +0000 (-0700)
Subject: Don't allow normal users to set idle IO priority
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f6fdd7d9c273bb2a20ab467cb57067494f932fa3;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Don't allow normal users to set idle IO priority

It has all the normal priority inversion problems.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 97e1f088ba00..d1c1f2b2c9da 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -62,6 +62,8 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 
 			break;
 		case IOPRIO_CLASS_IDLE:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
 			break;
 		default:
 			return -EINVAL;