From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC][PATCH 18/22] x86: __setup_frame(): consolidate uaccess areas
Date: Mon, 23 Mar 2020 18:38:15 +0000 [thread overview]
Message-ID: <20200323183819.250124-18-viro@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200323183819.250124-1-viro@ZenIV.linux.org.uk>
From: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/x86/kernel/signal.c | 23 ++++++-----------------
1 file changed, 6 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index a5a898c3c574..02b81784acc7 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -295,26 +295,17 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
{
struct sigframe __user *frame;
void __user *restorer;
- int err = 0;
void __user *fpstate = NULL;
frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
- if (!access_ok(frame, sizeof(*frame)))
- return -EFAULT;
-
- if (__put_user(sig, &frame->sig))
+ if (!user_access_begin(frame, sizeof(*frame)))
return -EFAULT;
- if (!user_access_begin(&frame->sc, sizeof(struct sigcontext)))
- return -EFAULT;
+ unsafe_put_user(sig, &frame->sig, Efault);
if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
goto Efault;
- user_access_end();
-
- if (__put_user(set->sig[1], &frame->extramask[0]))
- return -EFAULT;
-
+ unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
if (current->mm->context.vdso)
restorer = current->mm->context.vdso +
vdso_image_32.sym___kernel_sigreturn;
@@ -324,7 +315,7 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
restorer = ksig->ka.sa.sa_restorer;
/* Set up to return from userspace. */
- err |= __put_user(restorer, &frame->pretcode);
+ unsafe_put_user(restorer, &frame->pretcode, Efault);
/*
* This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
@@ -333,10 +324,8 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
* reasons and because gdb uses it as a signature to notice
* signal handler stack frames.
*/
- err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
-
- if (err)
- return -EFAULT;
+ unsafe_put_user(*((u64 *)&retcode), (u64 *)frame->retcode, Efault);
+ user_access_end();
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
--
2.11.0
next prev parent reply other threads:[~2020-03-23 18:38 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 18:36 [RFC][PATCHSET] x86 uaccess cleanups Al Viro
2020-03-23 18:37 ` [RFC][PATCH 01/22] x86 user stack frame reads: switch to explicit __get_user() Al Viro
2020-03-23 18:37 ` [RFC][PATCH 02/22] x86 kvm page table walks: " Al Viro
2020-03-23 18:38 ` [RFC][PATCH 03/22] x86: switch sigframe sigset handling to explict __get_user()/__put_user() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 04/22] x86: get rid of small constant size cases in raw_copy_{to,from}_user() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 05/22] vm86: get rid of get_user_ex() use Al Viro
2020-03-23 18:38 ` [RFC][PATCH 06/22] x86: get rid of get_user_ex() in ia32_restore_sigcontext() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 07/22] x86: get rid of get_user_ex() in restore_sigcontext() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 08/22] x86: kill get_user_{try,catch,ex} Al Viro
2020-03-23 18:38 ` [RFC][PATCH 09/22] x86: switch save_v86_state() to unsafe_put_user() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 10/22] x86: switch setup_sigcontext() " Al Viro
2020-03-23 18:38 ` [RFC][PATCH 11/22] x86: switch ia32_setup_sigcontext() " Al Viro
2020-03-23 18:38 ` [RFC][PATCH 12/22] x86: get rid of put_user_try in {ia32,x32}_setup_rt_frame() Al Viro
2020-03-23 18:38 ` [RFC][PATCH 13/22] x86: ia32_setup_sigcontext(): lift user_access_{begin,end}() into the callers Al Viro
2020-03-23 18:53 ` Linus Torvalds
2020-03-23 21:42 ` Al Viro
2020-03-23 18:38 ` [RFC][PATCH 14/22] x86: ia32_setup_frame(): consolidate uaccess areas Al Viro
2020-03-23 18:38 ` [RFC][PATCH 15/22] x86: ia32_setup_rt_frame(): " Al Viro
2020-03-23 18:38 ` [RFC][PATCH 16/22] x86: get rid of put_user_try in __setup_rt_frame() (both 32bit and 64bit) Al Viro
2020-03-23 18:38 ` [RFC][PATCH 17/22] x86: setup_sigcontext(): list user_access_{begin,end}() into callers Al Viro
2020-03-23 18:56 ` Linus Torvalds
2020-03-23 18:38 ` Al Viro [this message]
2020-03-23 18:38 ` [RFC][PATCH 19/22] x86: __setup_rt_frame(): consolidate uaccess areas Al Viro
2020-03-23 18:38 ` [RFC][PATCH 20/22] x86: x32_setup_rt_frame(): " Al Viro
2020-03-23 18:38 ` [RFC][PATCH 21/22] x86: unsafe_put_... macros for sigcontext and sigmask Al Viro
2020-03-23 18:38 ` [RFC][PATCH 22/22] kill uaccess_try() Al Viro
2020-03-24 15:15 ` [RFC][PATCH 01/22] x86 user stack frame reads: switch to explicit __get_user() Peter Zijlstra
2020-03-28 10:48 ` Ingo Molnar
2020-03-28 11:59 ` Al Viro
2020-03-29 9:26 ` Ingo Molnar
2020-03-29 16:50 ` Andy Lutomirski
2020-03-29 17:05 ` Linus Torvalds
2020-03-29 17:41 ` David Laight
2020-03-29 17:56 ` Linus Torvalds
2020-03-29 18:03 ` David Laight
2020-03-29 18:16 ` Linus Torvalds
2020-03-29 18:32 ` David Laight
2020-03-29 18:55 ` Linus Torvalds
2020-03-29 21:21 ` Andy Lutomirski
2020-03-29 22:06 ` Linus Torvalds
2020-03-29 22:12 ` Linus Torvalds
2020-03-29 18:16 ` Al Viro
2020-03-29 18:19 ` Linus Torvalds
2020-03-29 17:57 ` Al Viro
2020-03-30 15:54 ` David Laight
2020-03-23 19:16 ` [RFC][PATCHSET] x86 uaccess cleanups Linus Torvalds
2020-03-27 2:24 ` [RFC][PATCHSET v2] " Al Viro
2020-03-27 2:26 ` Al Viro
2020-03-27 2:30 ` Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 01/22] x86 user stack frame reads: switch to explicit __get_user() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 02/22] x86 kvm page table walks: " Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 03/22] x86: switch sigframe sigset handling to explict __get_user()/__put_user() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 04/22] x86: get rid of small constant size cases in raw_copy_{to,from}_user() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 05/22] vm86: get rid of get_user_ex() use Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 06/22] x86: get rid of get_user_ex() in ia32_restore_sigcontext() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 07/22] x86: get rid of get_user_ex() in restore_sigcontext() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 08/22] x86: kill get_user_{try,catch,ex} Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 09/22] x86: switch save_v86_state() to unsafe_put_user() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 10/22] x86: switch setup_sigcontext() " Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 11/22] x86: switch ia32_setup_sigcontext() " Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 12/22] x86: get rid of put_user_try in {ia32,x32}_setup_rt_frame() Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 13/22] x86: ia32_setup_sigcontext(): lift user_access_{begin,end}() into the callers Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 14/22] x86: ia32_setup_frame(): consolidate uaccess areas Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 15/22] x86: ia32_setup_rt_frame(): " Al Viro
2020-03-27 2:31 ` [RFC][PATCH v2 16/22] x86: get rid of put_user_try in __setup_rt_frame() (both 32bit and 64bit) Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 17/22] x86: setup_sigcontext(): list user_access_{begin,end}() into callers Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 18/22] x86: __setup_frame(): consolidate uaccess areas Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 19/22] x86: __setup_rt_frame(): " Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 20/22] x86: x32_setup_rt_frame(): " Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 21/22] x86: unsafe_put-style macro for sigmask Al Viro
2020-03-27 2:32 ` [RFC][PATCH v2 22/22] kill uaccess_try() Al Viro
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