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authorLinus Torvalds <torvalds@linux-foundation.org>2018-06-16 16:21:50 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-16 16:21:50 +0900
commit29d6849d88b61edf130aef500acad78206bda3cd (patch)
tree9b4b40e95871a2522cf57d0a170c0dfdb246ff7d /fs/signalfd.c
parenta5b729ea18ae601e7aea329e41052bbb861114bd (diff)
parent430ff79170d877c1602acb5a3701453dfa36b566 (diff)
downloadlinux-stericsson-29d6849d88b61edf130aef500acad78206bda3cd.tar.gz
Merge branch 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull compat updates from Al Viro: "Some biarch patches - getting rid of assorted (mis)uses of compat_alloc_user_space(). Not much in that area this cycle..." * 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: orangefs: simplify compat ioctl handling signalfd: lift sigmask copyin and size checks to callers of do_signalfd4() vmsplice(): lift importing iovec into vmsplice(2) and compat counterpart
Diffstat (limited to 'fs/signalfd.c')
-rw-r--r--fs/signalfd.c50
1 files changed, 25 insertions, 25 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c
index cbb42f77a2bd..4fcd1498acf5 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -259,10 +259,8 @@ static const struct file_operations signalfd_fops = {
.llseek = noop_llseek,
};
-static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
- int flags)
+static int do_signalfd4(int ufd, sigset_t *mask, int flags)
{
- sigset_t sigmask;
struct signalfd_ctx *ctx;
/* Check the SFD_* constants for consistency. */
@@ -272,18 +270,15 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
if (flags & ~(SFD_CLOEXEC | SFD_NONBLOCK))
return -EINVAL;
- if (sizemask != sizeof(sigset_t) ||
- copy_from_user(&sigmask, user_mask, sizeof(sigmask)))
- return -EINVAL;
- sigdelsetmask(&sigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
- signotset(&sigmask);
+ sigdelsetmask(mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
+ signotset(mask);
if (ufd == -1) {
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
- ctx->sigmask = sigmask;
+ ctx->sigmask = *mask;
/*
* When we call this, the initialization must be complete, since
@@ -303,7 +298,7 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
return -EINVAL;
}
spin_lock_irq(&current->sighand->siglock);
- ctx->sigmask = sigmask;
+ ctx->sigmask = *mask;
spin_unlock_irq(&current->sighand->siglock);
wake_up(&current->sighand->signalfd_wqh);
@@ -316,46 +311,51 @@ static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask, int, flags)
{
- return do_signalfd4(ufd, user_mask, sizemask, flags);
+ sigset_t mask;
+
+ if (sizemask != sizeof(sigset_t) ||
+ copy_from_user(&mask, user_mask, sizeof(mask)))
+ return -EINVAL;
+ return do_signalfd4(ufd, &mask, flags);
}
SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask)
{
- return do_signalfd4(ufd, user_mask, sizemask, 0);
+ sigset_t mask;
+
+ if (sizemask != sizeof(sigset_t) ||
+ copy_from_user(&mask, user_mask, sizeof(mask)))
+ return -EINVAL;
+ return do_signalfd4(ufd, &mask, 0);
}
#ifdef CONFIG_COMPAT
static long do_compat_signalfd4(int ufd,
- const compat_sigset_t __user *sigmask,
+ const compat_sigset_t __user *user_mask,
compat_size_t sigsetsize, int flags)
{
- sigset_t tmp;
- sigset_t __user *ksigmask;
+ sigset_t mask;
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
- if (get_compat_sigset(&tmp, sigmask))
- return -EFAULT;
- ksigmask = compat_alloc_user_space(sizeof(sigset_t));
- if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
+ if (get_compat_sigset(&mask, user_mask))
return -EFAULT;
-
- return do_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
+ return do_signalfd4(ufd, &mask, flags);
}
COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
- const compat_sigset_t __user *, sigmask,
+ const compat_sigset_t __user *, user_mask,
compat_size_t, sigsetsize,
int, flags)
{
- return do_compat_signalfd4(ufd, sigmask, sigsetsize, flags);
+ return do_compat_signalfd4(ufd, user_mask, sigsetsize, flags);
}
COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,
- const compat_sigset_t __user *,sigmask,
+ const compat_sigset_t __user *, user_mask,
compat_size_t, sigsetsize)
{
- return do_compat_signalfd4(ufd, sigmask, sigsetsize, 0);
+ return do_compat_signalfd4(ufd, user_mask, sigsetsize, 0);
}
#endif