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x86/entry: Use generic syscall exit functionality

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Replace the x86 variant with the generic version. Provide the relevant
architecture specific helper functions and defines.

Use a temporary define for idtentry_exit_user which will be cleaned up
seperately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200722220520.494648601@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-07-23 00:00:05 +02:00
parent 27d6b4d14f
commit 167fd210ec
7 changed files with 54 additions and 222 deletions
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44
arch/x86/include/asm/entry-common.h
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@@ -2,6 +2,12 @@
#ifndef _ASM_X86_ENTRY_COMMON_H
#define _ASM_X86_ENTRY_COMMON_H
#include <linux/user-return-notifier.h>
#include <asm/nospec-branch.h>
#include <asm/io_bitmap.h>
#include <asm/fpu/api.h>
/* Check that the stack and regs on entry from user mode are sane. */
static __always_inline void arch_check_user_regs(struct pt_regs *regs)
{
@@ -29,4 +35,42 @@ static __always_inline void arch_check_user_regs(struct pt_regs *regs)
}
#define arch_check_user_regs arch_check_user_regs
#define ARCH_SYSCALL_EXIT_WORK (_TIF_SINGLESTEP)
static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
unsigned long ti_work)
{
if (ti_work & _TIF_USER_RETURN_NOTIFY)
fire_user_return_notifiers();
if (unlikely(ti_work & _TIF_IO_BITMAP))
tss_update_io_bitmap();
fpregs_assert_state_consistent();
if (unlikely(ti_work & _TIF_NEED_FPU_LOAD))
switch_fpu_return();
#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.
*
* We also need to clear TS_REGS_POKED_I386: the 32-bit tracer
* special case only applies after poking regs and before the
* very next return to user mode.
*/
current_thread_info()->status &= ~(TS_COMPAT | TS_I386_REGS_POKED);
#endif
}
#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
static __always_inline void arch_exit_to_user_mode(void)
{
mds_user_clear_cpu_buffers();
}
#define arch_exit_to_user_mode arch_exit_to_user_mode
#endif

3
arch/x86/include/asm/idtentry.h
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@@ -13,8 +13,7 @@
/* Temporary define */
#define idtentry_enter_user irqentry_enter_from_user_mode
void idtentry_exit_user(struct pt_regs *regs);
#define idtentry_exit_user irqentry_exit_to_user_mode
typedef struct idtentry_state {
bool exit_rcu;

1
arch/x86/include/asm/signal.h
View File

@@ -35,7 +35,6 @@ typedef sigset_t compat_sigset_t;
#endif /* __ASSEMBLY__ */
#include <uapi/asm/signal.h>
#ifndef __ASSEMBLY__
extern void do_signal(struct pt_regs *regs);
#define __ARCH_HAS_SA_RESTORER