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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>
This commit is contained in:
Deepa Dinamani 2018-09-19 21:41:04 -07:00 committed by Arnd Bergmann
parent 651022382c
commit ded653ccbe
6 changed files with 76 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
fs/aio.c
View File

@ -2104,14 +2104,10 @@ SYSCALL_DEFINE6(io_pgetevents,
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
if (ksig.sigmask) {
if (ksig.sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&ksigmask, ksig.sigmask, sizeof(ksigmask)))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize);
if (ret)
return ret;
ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &ts : NULL);
if (signal_pending(current)) {
@ -2174,14 +2170,9 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents,
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
if (ksig.sigmask) {
if (ksig.sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (get_compat_sigset(&ksigmask, ksig.sigmask))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_compat_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize);
if (ret)
return ret;
ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &t : NULL);
if (signal_pending(current)) {

22
fs/eventpoll.c
View File

@ -2223,14 +2223,9 @@ SYSCALL_DEFINE6(epoll_pwait, int, epfd, struct epoll_event __user *, events,
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
if (sigmask) {
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
return -EFAULT;
sigsaved = current->blocked;
set_current_blocked(&ksigmask);
}
error = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (error)
return error;
error = do_epoll_wait(epfd, events, maxevents, timeout);
@ -2266,14 +2261,9 @@ COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (get_compat_sigset(&ksigmask, sigmask))
return -EFAULT;
sigsaved = current->blocked;
set_current_blocked(&ksigmask);
}
err = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (err)
return err;
err = do_epoll_wait(epfd, events, maxevents, timeout);

50
fs/select.c
View File

@ -717,16 +717,9 @@ static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp,
return -EINVAL;
}
if (sigmask) {
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (ret)
return ret;
ret = core_sys_select(n, inp, outp, exp, to);
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
@ -1061,16 +1054,9 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
return -EINVAL;
}
if (sigmask) {
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
@ -1323,15 +1309,9 @@ static long do_compat_pselect(int n, compat_ulong_t __user *inp,
return -EINVAL;
}
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (get_compat_sigset(&ksigmask, sigmask))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (ret)
return ret;
ret = compat_core_sys_select(n, inp, outp, exp, to);
ret = compat_poll_select_copy_remaining(&end_time, tsp, 0, ret);
@ -1389,15 +1369,9 @@ COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
return -EINVAL;
}
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (get_compat_sigset(&ksigmask, sigmask))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);

4
include/linux/compat.h
View File

@ -169,6 +169,10 @@ typedef struct {
compat_sigset_word sig[_COMPAT_NSIG_WORDS];
} compat_sigset_t;
int set_compat_user_sigmask(const compat_sigset_t __user *usigmask,
sigset_t *set, sigset_t *oldset,
size_t sigsetsize);
struct compat_sigaction {
#ifndef __ARCH_HAS_IRIX_SIGACTION
compat_uptr_t sa_handler;

2
include/linux/signal.h
View File

@ -273,6 +273,8 @@ extern int group_send_sig_info(int sig, struct kernel_siginfo *info,
struct task_struct *p, enum pid_type type);
extern int __group_send_sig_info(int, struct kernel_siginfo *, struct task_struct *);
extern int sigprocmask(int, sigset_t *, sigset_t *);
extern int set_user_sigmask(const sigset_t __user *usigmask, sigset_t *set,
sigset_t *oldset, size_t sigsetsize);
extern void set_current_blocked(sigset_t *);
extern void __set_current_blocked(const sigset_t *);
extern int show_unhandled_signals;

45
kernel/signal.c
View File

@ -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