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 --- include/uapi/asm-generic/termbits-common.h | 66 ++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 include/uapi/asm-generic/termbits-common.h (limited to 'include/uapi/asm-generic/termbits-common.h') diff --git a/include/uapi/asm-generic/termbits-common.h b/include/uapi/asm-generic/termbits-common.h new file mode 100644 index 000000000..4a6a79f28 --- /dev/null +++ b/include/uapi/asm-generic/termbits-common.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef __ASM_GENERIC_TERMBITS_COMMON_H +#define __ASM_GENERIC_TERMBITS_COMMON_H + +typedef unsigned char cc_t; +typedef unsigned int speed_t; + +/* c_iflag bits */ +#define IGNBRK 0x001 /* Ignore break condition */ +#define BRKINT 0x002 /* Signal interrupt on break */ +#define IGNPAR 0x004 /* Ignore characters with parity errors */ +#define PARMRK 0x008 /* Mark parity and framing errors */ +#define INPCK 0x010 /* Enable input parity check */ +#define ISTRIP 0x020 /* Strip 8th bit off characters */ +#define INLCR 0x040 /* Map NL to CR on input */ +#define IGNCR 0x080 /* Ignore CR */ +#define ICRNL 0x100 /* Map CR to NL on input */ +#define IXANY 0x800 /* Any character will restart after stop */ + +/* c_oflag bits */ +#define OPOST 0x01 /* Perform output processing */ +#define OCRNL 0x08 +#define ONOCR 0x10 +#define ONLRET 0x20 +#define OFILL 0x40 +#define OFDEL 0x80 + +/* c_cflag bit meaning */ +/* Common CBAUD rates */ +#define B0 0x00000000 /* hang up */ +#define B50 0x00000001 +#define B75 0x00000002 +#define B110 0x00000003 +#define B134 0x00000004 +#define B150 0x00000005 +#define B200 0x00000006 +#define B300 0x00000007 +#define B600 0x00000008 +#define B1200 0x00000009 +#define B1800 0x0000000a +#define B2400 0x0000000b +#define B4800 0x0000000c +#define B9600 0x0000000d +#define B19200 0x0000000e +#define B38400 0x0000000f +#define EXTA B19200 +#define EXTB B38400 + +#define ADDRB 0x20000000 /* address bit */ +#define CMSPAR 0x40000000 /* mark or space (stick) parity */ +#define CRTSCTS 0x80000000 /* flow control */ + +#define IBSHIFT 16 /* Shift from CBAUD to CIBAUD */ + +/* tcflow() ACTION argument and TCXONC use these */ +#define TCOOFF 0 /* Suspend output */ +#define TCOON 1 /* Restart suspended output */ +#define TCIOFF 2 /* Send a STOP character */ +#define TCION 3 /* Send a START character */ + +/* tcflush() QUEUE_SELECTOR argument and TCFLSH use these */ +#define TCIFLUSH 0 /* Discard data received but not yet read */ +#define TCOFLUSH 1 /* Discard data written but not yet sent */ +#define TCIOFLUSH 2 /* Discard all pending data */ + +#endif /* __ASM_GENERIC_TERMBITS_COMMON_H */ -- cgit v1.3.1