修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/block/ioprio.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * fs/ioprio.c
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  *
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@@ -16,7 +17,7 @@
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  *
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  * ioprio_set(PRIO_PROCESS, pid, prio);
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  *
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- * See also Documentation/block/ioprio.txt
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+ * See also Documentation/block/ioprio.rst
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  *
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  */
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 #include <linux/gfp.h>
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@@ -68,9 +69,16 @@
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 	switch (class) {
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 		case IOPRIO_CLASS_RT:
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-			if (!capable(CAP_SYS_ADMIN))
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+			/*
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+			 * Originally this only checked for CAP_SYS_ADMIN,
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+			 * which was implicitly allowed for pid 0 by security
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+			 * modules such as SELinux. Make sure we check
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+			 * CAP_SYS_ADMIN first to avoid a denial/avc for
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+			 * possibly missing CAP_SYS_NICE permission.
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+			 */
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+			if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE))
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 				return -EPERM;
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-			/* fall through */
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+			fallthrough;
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 			/* rt has prio field too */
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 		case IOPRIO_CLASS_BE:
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 			if (data >= IOPRIO_BE_NR || data < 0)