diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-02-15 21:22:39 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-03-26 14:57:10 -0400 |
| commit | ead8e4e7e2c75ced6fcd9a53d3e9a2ecd7368553 (patch) | |
| tree | 8056d33b3765ddfe2f9047caadb8847c15fee713 /arch/x86/kernel/signal.c | |
| parent | 5c1f178094631e8b9acc67e4a9b6e03abfbc2529 (diff) | |
x86: __setup_rt_frame(): consolidate uaccess areas
reorder copy_siginfo_to_user() calls a bit
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/kernel/signal.c')
| -rw-r--r-- | arch/x86/kernel/signal.c | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index 38ff834ba0d6..e37d5a1bb713 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -357,7 +357,6 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig, { struct rt_sigframe __user *frame; void __user *restorer; - int err = 0; void __user *fp = NULL; frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp); @@ -393,11 +392,11 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig, */ unsafe_put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode, Efault); unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault); + unsafe_put_user(*(__u64 *)set, + (__u64 __user *)&frame->uc.uc_sigmask, Efault); user_access_end(); - err |= copy_siginfo_to_user(&frame->info, &ksig->info); - err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - if (err) + if (copy_siginfo_to_user(&frame->info, &ksig->info)) return -EFAULT; /* Set up registers for signal handler */ @@ -439,23 +438,14 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig, struct rt_sigframe __user *frame; void __user *fp = NULL; unsigned long uc_flags; - int err = 0; /* x86-64 should always use SA_RESTORER. */ if (!(ksig->ka.sa.sa_flags & SA_RESTORER)) return -EFAULT; frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp); - - if (!access_ok(frame, sizeof(*frame))) - return -EFAULT; - - if (ksig->ka.sa.sa_flags & SA_SIGINFO) { - if (copy_siginfo_to_user(&frame->info, &ksig->info)) - return -EFAULT; - } - uc_flags = frame_uc_flags(regs); + if (!user_access_begin(frame, sizeof(*frame))) return -EFAULT; @@ -468,11 +458,13 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig, already in userspace. */ unsafe_put_user(ksig->ka.sa.sa_restorer, &frame->pretcode, Efault); unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault); + unsafe_put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0], Efault); user_access_end(); - err |= __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]); - if (err) - return -EFAULT; + if (ksig->ka.sa.sa_flags & SA_SIGINFO) { + if (copy_siginfo_to_user(&frame->info, &ksig->info)) + return -EFAULT; + } /* Set up registers for signal handler */ regs->di = sig; |