linux-kernel - [tip: locking/core] futex: Extend the FUTEX2 flags

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Message-ID: <169531776622.27769.3661853983494438744.tip-bot2@tip-bot2>
Date:   Thu, 21 Sep 2023 17:36:06 -0000
From:   "tip-bot2 for peterz@...radead.org" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, andrealmeid@...lia.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: locking/core] futex: Extend the FUTEX2 flags

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     d6d08d24790e82c69a46ef78ae44fe1b1ed30775
Gitweb:        https://git.kernel.org/tip/d6d08d24790e82c69a46ef78ae44fe1b1ed30775
Author:        peterz@...radead.org <peterz@...radead.org>
AuthorDate:    Thu, 21 Sep 2023 12:45:07 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 21 Sep 2023 19:22:05 +02:00

futex: Extend the FUTEX2 flags

Add the definition for the missing but always intended extra sizes,
and add a NUMA flag for the planned numa extention.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: André Almeida <andrealmeid@...lia.com>
Link: https://lore.kernel.org/r/20230921105247.617057368@noisy.programming.kicks-ass.net
---
 include/uapi/linux/futex.h | 21 ++++++++++++++++++---
 kernel/futex/syscalls.c    |  9 +++++++--
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/include/uapi/linux/futex.h b/include/uapi/linux/futex.h
index 21d4eff..d2ee625 100644
--- a/include/uapi/linux/futex.h
+++ b/include/uapi/linux/futex.h
@@ -45,17 +45,32 @@
 
 /*
  * Flags for futex2 syscalls.
+ *
+ * NOTE: these are not pure flags, they can also be seen as:
+ *
+ *   union {
+ *     u32  flags;
+ *     struct {
+ *       u32 size    : 2,
+ *           numa    : 1,
+ *                   : 4,
+ *           private : 1;
+ *     };
+ *   };
  */
-			/*	0x00 */
-			/*	0x01 */
+#define FUTEX2_SIZE_U8		0x00
+#define FUTEX2_SIZE_U16		0x01
 #define FUTEX2_SIZE_U32		0x02
-			/*	0x04 */
+#define FUTEX2_SIZE_U64		0x03
+#define FUTEX2_NUMA		0x04
 			/*	0x08 */
 			/*	0x10 */
 			/*	0x20 */
 			/*	0x40 */
 #define FUTEX2_PRIVATE		FUTEX_PRIVATE_FLAG
 
+#define FUTEX2_SIZE_MASK	0x03
+
 /* do not use */
 #define FUTEX_32		FUTEX2_SIZE_U32 /* historical accident :-( */
 
diff --git a/kernel/futex/syscalls.c b/kernel/futex/syscalls.c
index ff696b0..953f0a4 100644
--- a/kernel/futex/syscalls.c
+++ b/kernel/futex/syscalls.c
@@ -183,7 +183,7 @@ SYSCALL_DEFINE6(futex, u32 __user *, uaddr, int, op, u32, val,
 	return do_futex(uaddr, op, val, tp, uaddr2, (unsigned long)utime, val3);
 }
 
-#define FUTEX2_VALID_MASK (FUTEX2_SIZE_U32 | FUTEX2_PRIVATE)
+#define FUTEX2_VALID_MASK (FUTEX2_SIZE_MASK | FUTEX2_PRIVATE)
 
 /**
  * futex_parse_waitv - Parse a waitv array from userspace
@@ -207,7 +207,12 @@ static int futex_parse_waitv(struct futex_vector *futexv,
 		if ((aux.flags & ~FUTEX2_VALID_MASK) || aux.__reserved)
 			return -EINVAL;
 
-		if (!(aux.flags & FUTEX2_SIZE_U32))
+		if (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()) {
+			if ((aux.flags & FUTEX2_SIZE_MASK) == FUTEX2_SIZE_U64)
+				return -EINVAL;
+		}
+
+		if ((aux.flags & FUTEX2_SIZE_MASK) != FUTEX2_SIZE_U32)
 			return -EINVAL;
 
 		futexv[i].w.flags = aux.flags;