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 v2 03/22] x86: switch sigframe sigset handling to explict __get_user()/__put_user()
Date: Fri, 27 Mar 2020 02:31:46 +0000 [thread overview]
Message-ID: <20200327023205.881896-3-viro@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200327023205.881896-1-viro@ZenIV.linux.org.uk>
From: Al Viro <viro@zeniv.linux.org.uk>
... and consolidate the definition of sigframe_ia32->extramask - it's
always a 1-element array of 32bit unsigned.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/x86/ia32/ia32_signal.c | 16 +++++-----------
arch/x86/include/asm/sigframe.h | 6 +-----
arch/x86/kernel/signal.c | 20 ++++++++------------
3 files changed, 14 insertions(+), 28 deletions(-)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index a3aefe9b9401..c72025d615f8 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -126,10 +126,7 @@ COMPAT_SYSCALL_DEFINE0(sigreturn)
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
- || (_COMPAT_NSIG_WORDS > 1
- && __copy_from_user((((char *) &set.sig) + 4),
- &frame->extramask,
- sizeof(frame->extramask))))
+ || __get_user(((__u32 *)&set)[1], &frame->extramask[0]))
goto badframe;
set_current_blocked(&set);
@@ -153,7 +150,7 @@ COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
goto badframe;
set_current_blocked(&set);
@@ -277,11 +274,8 @@ int ia32_setup_frame(int sig, struct ksignal *ksig,
if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
return -EFAULT;
- if (_COMPAT_NSIG_WORDS > 1) {
- if (__copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask)))
- return -EFAULT;
- }
+ if (__put_user(set->sig[1], &frame->extramask[0]))
+ return -EFAULT;
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
restorer = ksig->ka.sa.sa_restorer;
@@ -381,7 +375,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
err |= __copy_siginfo_to_user32(&frame->info, &ksig->info, false);
err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ err |= __put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask);
if (err)
return -EFAULT;
diff --git a/arch/x86/include/asm/sigframe.h b/arch/x86/include/asm/sigframe.h
index f176114c04d4..84eab2724875 100644
--- a/arch/x86/include/asm/sigframe.h
+++ b/arch/x86/include/asm/sigframe.h
@@ -33,11 +33,7 @@ struct sigframe_ia32 {
* legacy application accessing/modifying it.
*/
struct _fpstate_32 fpstate_unused;
-#ifdef CONFIG_IA32_EMULATION
- unsigned int extramask[_COMPAT_NSIG_WORDS-1];
-#else /* !CONFIG_IA32_EMULATION */
- unsigned long extramask[_NSIG_WORDS-1];
-#endif /* CONFIG_IA32_EMULATION */
+ unsigned int extramask[1];
char retcode[8];
/* fp state follows here */
};
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 8a29573851a3..53ac66b3fd9b 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -326,11 +326,8 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
return -EFAULT;
- if (_NSIG_WORDS > 1) {
- if (__copy_to_user(&frame->extramask, &set->sig[1],
- sizeof(frame->extramask)))
- return -EFAULT;
- }
+ if (__put_user(set->sig[1], &frame->extramask[0]))
+ return -EFAULT;
if (current->mm->context.vdso)
restorer = current->mm->context.vdso +
@@ -489,7 +486,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
} put_user_catch(err);
err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ err |= __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
if (err)
return -EFAULT;
@@ -575,7 +572,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ err |= __put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask);
if (err)
return -EFAULT;
@@ -613,9 +610,8 @@ SYSCALL_DEFINE0(sigreturn)
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
- if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
- && __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
+ if (__get_user(set.sig[0], &frame->sc.oldmask) ||
+ __get_user(set.sig[1], &frame->extramask[0]))
goto badframe;
set_current_blocked(&set);
@@ -645,7 +641,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
goto badframe;
if (__get_user(uc_flags, &frame->uc.uc_flags))
goto badframe;
@@ -870,7 +866,7 @@ asmlinkage long sys32_x32_rt_sigreturn(void)
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
goto badframe;
if (__get_user(uc_flags, &frame->uc.uc_flags))
goto badframe;
--
2.11.0
next prev parent reply other threads:[~2020-03-27 2:32 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 ` [RFC][PATCH 18/22] x86: __setup_frame(): consolidate uaccess areas Al Viro
2020-03-23 18:38 ` [RFC][PATCH 19/22] x86: __setup_rt_frame(): " 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 ` Al Viro [this message]
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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