diff options
Diffstat (limited to 'kernel/arch/x86/entry')
| -rw-r--r-- | kernel/arch/x86/entry/common.c | 23 | ||||
| -rw-r--r-- | kernel/arch/x86/entry/entry_32.S | 4 | ||||
| -rw-r--r-- | kernel/arch/x86/entry/syscalls/syscall_32.tbl | 2 |
3 files changed, 16 insertions, 13 deletions
diff --git a/kernel/arch/x86/entry/common.c b/kernel/arch/x86/entry/common.c index 3ec240f39..75a301b6a 100644 --- a/kernel/arch/x86/entry/common.c +++ b/kernel/arch/x86/entry/common.c @@ -275,6 +275,7 @@ static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags) /* Called with IRQs disabled. */ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs) { + struct thread_info *ti = pt_regs_to_thread_info(regs); u32 cached_flags; if (IS_ENABLED(CONFIG_PROVE_LOCKING) && WARN_ON(!irqs_disabled())) @@ -282,12 +283,22 @@ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs) lockdep_sys_exit(); - cached_flags = - READ_ONCE(pt_regs_to_thread_info(regs)->flags); + cached_flags = READ_ONCE(ti->flags); if (unlikely(cached_flags & EXIT_TO_USERMODE_LOOP_FLAGS)) exit_to_usermode_loop(regs, cached_flags); +#ifdef CONFIG_COMPAT + /* + * Compat syscalls set TS_COMPAT. Make sure we clear it before + * returning to user mode. We need to clear it *after* signal + * handling, because syscall restart has a fixup for compat + * syscalls. The fixup is exercised by the ptrace_syscall_32 + * selftest. + */ + ti->status &= ~TS_COMPAT; +#endif + user_enter(); } @@ -339,14 +350,6 @@ __visible inline void syscall_return_slowpath(struct pt_regs *regs) if (unlikely(cached_flags & SYSCALL_EXIT_WORK_FLAGS)) syscall_slow_exit_work(regs, cached_flags); -#ifdef CONFIG_COMPAT - /* - * Compat syscalls set TS_COMPAT. Make sure we clear it before - * returning to user mode. - */ - ti->status &= ~TS_COMPAT; -#endif - local_irq_disable(); prepare_exit_to_usermode(regs); } diff --git a/kernel/arch/x86/entry/entry_32.S b/kernel/arch/x86/entry/entry_32.S index 2d722ee01..3bcef8bdb 100644 --- a/kernel/arch/x86/entry/entry_32.S +++ b/kernel/arch/x86/entry/entry_32.S @@ -782,8 +782,8 @@ ftrace_graph_call: jmp ftrace_stub #endif -.globl ftrace_stub -ftrace_stub: +/* This is weak to keep gas from relaxing the jumps */ +WEAK(ftrace_stub) ret END(ftrace_caller) diff --git a/kernel/arch/x86/entry/syscalls/syscall_32.tbl b/kernel/arch/x86/entry/syscalls/syscall_32.tbl index f17705e13..e62f4401e 100644 --- a/kernel/arch/x86/entry/syscalls/syscall_32.tbl +++ b/kernel/arch/x86/entry/syscalls/syscall_32.tbl @@ -294,7 +294,7 @@ # 285 sys_setaltroot 286 i386 add_key sys_add_key 287 i386 request_key sys_request_key -288 i386 keyctl sys_keyctl +288 i386 keyctl sys_keyctl compat_sys_keyctl 289 i386 ioprio_set sys_ioprio_set 290 i386 ioprio_get sys_ioprio_get 291 i386 inotify_init sys_inotify_init |