From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- tools/arch/hexagon/include/uapi/asm/mman.h | 7 +++++ tools/arch/hexagon/include/uapi/asm/unistd.h | 40 ++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) create mode 100644 tools/arch/hexagon/include/uapi/asm/mman.h create mode 100644 tools/arch/hexagon/include/uapi/asm/unistd.h (limited to 'tools/arch/hexagon/include') diff --git a/tools/arch/hexagon/include/uapi/asm/mman.h b/tools/arch/hexagon/include/uapi/asm/mman.h new file mode 100644 index 000000000..cd59ba932 --- /dev/null +++ b/tools/arch/hexagon/include/uapi/asm/mman.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef TOOLS_ARCH_HEXAGON_UAPI_ASM_MMAN_FIX_H +#define TOOLS_ARCH_HEXAGON_UAPI_ASM_MMAN_FIX_H +#include +/* MAP_32BIT is undefined on hexagon, fix it for perf */ +#define MAP_32BIT 0 +#endif diff --git a/tools/arch/hexagon/include/uapi/asm/unistd.h b/tools/arch/hexagon/include/uapi/asm/unistd.h new file mode 100644 index 000000000..432c4db1b --- /dev/null +++ b/tools/arch/hexagon/include/uapi/asm/unistd.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Syscall support for Hexagon + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * The kernel pulls this unistd.h in three different ways: + * 1. the "normal" way which gets all the __NR defines + * 2. with __SYSCALL defined to produce function declarations + * 3. with __SYSCALL defined to produce syscall table initialization + * See also: syscalltab.c + */ + +#define sys_mmap2 sys_mmap_pgoff +#define __ARCH_WANT_RENAMEAT +#define __ARCH_WANT_STAT64 +#define __ARCH_WANT_SET_GET_RLIMIT +#define __ARCH_WANT_SYS_EXECVE +#define __ARCH_WANT_SYS_CLONE +#define __ARCH_WANT_SYS_VFORK +#define __ARCH_WANT_SYS_FORK +#define __ARCH_WANT_TIME32_SYSCALLS + +#include -- cgit v1.3.1