From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tony Luck <tony.luck@intel.com>,
Alexei Starovoitov <ast@kernel.org>,
Peter Ziljstra <peterz@infradead.org>,
Song Liu <songliubraving@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>
Subject: [patch V3 16/20] x86/signal: Change return type of restore_sigcontext() to boolean
Date: Wed, 8 Sep 2021 15:29:35 +0200 (CEST) [thread overview]
Message-ID: <20210908132525.851280949@linutronix.de> (raw)
In-Reply-To: 20210908130922.118265849@linutronix.de
None of the call sites cares about the return code. All they are interested
in is success or fail.
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/ia32/ia32_signal.c | 12 ++++++------
arch/x86/kernel/signal.c | 18 +++++++++---------
2 files changed, 15 insertions(+), 15 deletions(-)
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -57,8 +57,8 @@ static inline void reload_segments(struc
/*
* Do a signal return; undo the signal stack.
*/
-static int ia32_restore_sigcontext(struct pt_regs *regs,
- struct sigcontext_32 __user *usc)
+static bool ia32_restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext_32 __user *usc)
{
struct sigcontext_32 sc;
@@ -66,7 +66,7 @@ static int ia32_restore_sigcontext(struc
current->restart_block.fn = do_no_restart_syscall;
if (unlikely(copy_from_user(&sc, usc, sizeof(sc))))
- return -EFAULT;
+ return false;
/* Get only the ia32 registers. */
regs->bx = sc.bx;
@@ -94,7 +94,7 @@ static int ia32_restore_sigcontext(struc
* normal case.
*/
reload_segments(&sc);
- return fpu__restore_sig(compat_ptr(sc.fpstate), 1);
+ return !fpu__restore_sig(compat_ptr(sc.fpstate), 1);
}
COMPAT_SYSCALL_DEFINE0(sigreturn)
@@ -111,7 +111,7 @@ COMPAT_SYSCALL_DEFINE0(sigreturn)
set_current_blocked(&set);
- if (ia32_restore_sigcontext(regs, &frame->sc))
+ if (!ia32_restore_sigcontext(regs, &frame->sc))
goto badframe;
return regs->ax;
@@ -135,7 +135,7 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
set_current_blocked(&set);
- if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ if (!ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
if (compat_restore_altstack(&frame->uc.uc_stack))
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -79,9 +79,9 @@ static void force_valid_ss(struct pt_reg
# define CONTEXT_COPY_SIZE sizeof(struct sigcontext)
#endif
-static int restore_sigcontext(struct pt_regs *regs,
- struct sigcontext __user *usc,
- unsigned long uc_flags)
+static bool restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext __user *usc,
+ unsigned long uc_flags)
{
struct sigcontext sc;
@@ -89,7 +89,7 @@ static int restore_sigcontext(struct pt_
current->restart_block.fn = do_no_restart_syscall;
if (copy_from_user(&sc, usc, CONTEXT_COPY_SIZE))
- return -EFAULT;
+ return false;
#ifdef CONFIG_X86_32
set_user_gs(regs, sc.gs);
@@ -136,8 +136,8 @@ static int restore_sigcontext(struct pt_
force_valid_ss(regs);
#endif
- return fpu__restore_sig((void __user *)sc.fpstate,
- IS_ENABLED(CONFIG_X86_32));
+ return !fpu__restore_sig((void __user *)sc.fpstate,
+ IS_ENABLED(CONFIG_X86_32));
}
static __always_inline int
@@ -641,7 +641,7 @@ SYSCALL_DEFINE0(sigreturn)
* x86_32 has no uc_flags bits relevant to restore_sigcontext.
* Save a few cycles by skipping the __get_user.
*/
- if (restore_sigcontext(regs, &frame->sc, 0))
+ if (!restore_sigcontext(regs, &frame->sc, 0))
goto badframe;
return regs->ax;
@@ -669,7 +669,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
set_current_blocked(&set);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
+ if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
goto badframe;
if (restore_altstack(&frame->uc.uc_stack))
@@ -927,7 +927,7 @@ COMPAT_SYSCALL_DEFINE0(x32_rt_sigreturn)
set_current_blocked(&set);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
+ if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
goto badframe;
if (compat_restore_altstack(&frame->uc.uc_stack))
next prev parent reply other threads:[~2021-09-08 13:30 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-08 13:29 [patch V3 00/20] x86/fpu: Clean up exception fixups and error handling in sigframe related code Thomas Gleixner
2021-09-08 13:29 ` [patch V3 01/20] x86/extable: Tidy up redundant handler functions Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 02/20] x86/extable: Get rid of redundant macros Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 03/20] x86/mce: Deduplicate exception handling Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 04/20] x86/mce: Get rid of stray semicolons Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 05/20] x86/extable: Rework the exception table mechanics Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 06/20] x86/extable: Provide EX_TYPE_DEFAULT_MCE_SAFE and EX_TYPE_FAULT_MCE_SAFE Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 07/20] x86/copy_mc: Use EX_TYPE_DEFAULT_MCE_SAFE for exception fixups Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 08/20] x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 09/20] x86/extable: Remove EX_TYPE_FAULT from MCE safe fixups Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 10/20] x86/fpu/signal: Clarify exception handling in restore_fpregs_from_user() Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 11/20] x86/fpu: Dont use MCE safe fixups for writing FPU state to user space Thomas Gleixner
2021-09-08 13:29 ` [patch V3 12/20] x86/fpu/signal: Move header zeroing out of xsave_to_user_sigframe() Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 13/20] x86/fpu/signal: Move xstate clearing out of copy_fpregs_to_sigframe() Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 14/20] x86/fpu/signal: Change return type of copy_fpstate_to_sigframe() to boolean Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 15/20] x86/fpu/signal: Change return type of copy_fpregs_to_sigframe() helpers " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-21 10:58 ` [patch V3 15/20] " Anders Roxell
2021-09-21 17:35 ` Nick Desaulniers
2021-09-22 18:23 ` Nick Desaulniers
2021-09-21 20:13 ` Thomas Gleixner
2021-09-22 19:42 ` Anders Roxell
2021-09-08 13:29 ` Thomas Gleixner [this message]
2021-09-14 19:19 ` [tip: x86/fpu] x86/signal: Change return type of restore_sigcontext() " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 17/20] x86/fpu/signal: Change return type of fpu__restore_sig() " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 18/20] x86/fpu/signal: Change return type of __fpu_restore_sig() " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 19/20] x86/fpu/signal: Change return code of check_xstate_in_sigframe() " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 13:29 ` [patch V3 20/20] x86/fpu/signal: Change return code of restore_fpregs_from_user() " Thomas Gleixner
2021-09-14 19:19 ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-09-08 15:57 ` [patch V3 00/20] x86/fpu: Clean up exception fixups and error handling in sigframe related code Luck, Tony
2021-09-08 17:01 ` Luck, Tony
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