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authorDeepa Dinamani <deepa.kernel@gmail.com>2018-09-19 21:41:04 -0700
committerArnd Bergmann <arnd@arndb.de>2018-12-06 17:22:38 +0100
commitded653ccbec0335a78fa7a7aff3ec9870349fafb (patch)
treecaf214e4cbbee0df4eb94c304651d7790b630f51 /kernel/signal.c
parent651022382c7f8da46cb4872a545ee1da6d097d2a (diff)
downloadlinux-ded653ccbec0335a78fa7a7aff3ec9870349fafb.tar.bz2
signal: Add set_user_sigmask()
Refactor reading sigset from userspace and updating sigmask into an api. This is useful for versions of syscalls that pass in the sigmask and expect the current->sigmask to be changed during, and restored after, the execution of the syscall. With the advent of new y2038 syscalls in the subsequent patches, we add two more new versions of the syscalls (for pselect, ppoll, and io_pgetevents) in addition to the existing native and compat versions. Adding such an api reduces the logic that would need to be replicated otherwise. Note that the calls to sigprocmask() ignored the return value from the api as the function only returns an error on an invalid first argument that is hardcoded at these call sites. The updated logic uses set_current_blocked() instead. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 9a32bc2088c9..811b5d440617 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2735,6 +2735,51 @@ int sigprocmask(int how, sigset_t *set, sigset_t *oldset)
}
EXPORT_SYMBOL(sigprocmask);
+/*
+ * The api helps set app-provided sigmasks.
+ *
+ * This is useful for syscalls such as ppoll, pselect, io_pgetevents and
+ * epoll_pwait where a new sigmask is passed from userland for the syscalls.
+ */
+int set_user_sigmask(const sigset_t __user *usigmask, sigset_t *set,
+ sigset_t *oldset, size_t sigsetsize)
+{
+ if (!usigmask)
+ return 0;
+
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+ if (copy_from_user(set, usigmask, sizeof(sigset_t)))
+ return -EFAULT;
+
+ *oldset = current->blocked;
+ set_current_blocked(set);
+
+ return 0;
+}
+EXPORT_SYMBOL(set_user_sigmask);
+
+#ifdef CONFIG_COMPAT
+int set_compat_user_sigmask(const compat_sigset_t __user *usigmask,
+ sigset_t *set, sigset_t *oldset,
+ size_t sigsetsize)
+{
+ if (!usigmask)
+ return 0;
+
+ if (sigsetsize != sizeof(compat_sigset_t))
+ return -EINVAL;
+ if (get_compat_sigset(set, usigmask))
+ return -EFAULT;
+
+ *oldset = current->blocked;
+ set_current_blocked(set);
+
+ return 0;
+}
+EXPORT_SYMBOL(set_compat_user_sigmask);
+#endif
+
/**
* sys_rt_sigprocmask - change the list of currently blocked signals
* @how: whether to add, remove, or set signals