From facbbe0d5f9745d460d09be4669cd194186d766b Mon Sep 17 00:00:00 2001 From: Elvira Khabirova Date: Sat, 18 Feb 2023 23:43:59 +0100 Subject: [PATCH] mips: fix syscall_get_nr commit 85cc91e2ba4262a602ec65e2b76c4391a9e60d3d upstream. The implementation of syscall_get_nr on mips used to ignore the task argument and return the syscall number of the calling thread instead of the target thread. The bug was exposed to user space by commit 201766a20e30f ("ptrace: add PTRACE_GET_SYSCALL_INFO request") and detected by strace test suite. Link: https://github.com/strace/strace/issues/235 Fixes: c2d9f1775731 ("MIPS: Fix syscall_get_nr for the syscall exit tracing.") Cc: # v3.19+ Co-developed-by: Dmitry V. Levin Signed-off-by: Dmitry V. Levin Signed-off-by: Elvira Khabirova Signed-off-by: Thomas Bogendoerfer Signed-off-by: Greg Kroah-Hartman --- arch/mips/include/asm/syscall.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h index 53ee82b1efa7..305597e26b13 100644 --- a/arch/mips/include/asm/syscall.h +++ b/arch/mips/include/asm/syscall.h @@ -29,7 +29,7 @@ static inline long syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { - return current_thread_info()->syscall; + return task_thread_info(task)->syscall; } static inline unsigned long mips_get_syscall_arg(unsigned long *arg,