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-rw-r--r--fs/select.c96
1 files changed, 25 insertions, 71 deletions
diff --git a/fs/select.c b/fs/select.c
index a4d8f6e8b63c..53a0c149f528 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -294,12 +294,14 @@ enum poll_time_type {
PT_OLD_TIMESPEC = 3,
};
-static int poll_select_copy_remaining(struct timespec64 *end_time,
- void __user *p,
- enum poll_time_type pt_type, int ret)
+static int poll_select_finish(struct timespec64 *end_time,
+ void __user *p,
+ enum poll_time_type pt_type, int ret)
{
struct timespec64 rts;
+ restore_saved_sigmask_unless(ret == -ERESTARTNOHAND);
+
if (!p)
return ret;
@@ -714,9 +716,7 @@ static int kern_select(int n, fd_set __user *inp, fd_set __user *outp,
}
ret = core_sys_select(n, inp, outp, exp, to);
- ret = poll_select_copy_remaining(&end_time, tvp, PT_TIMEVAL, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tvp, PT_TIMEVAL, ret);
}
SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
@@ -730,7 +730,6 @@ static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp,
const sigset_t __user *sigmask, size_t sigsetsize,
enum poll_time_type type)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -753,15 +752,12 @@ static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp,
return -EINVAL;
}
- ret = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = core_sys_select(n, inp, outp, exp, to);
- restore_user_sigmask(sigmask, &sigsaved, ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, type, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, type, ret);
}
/*
@@ -926,7 +922,7 @@ static int do_poll(struct poll_list *list, struct poll_wqueues *wait,
if (!count) {
count = wait->error;
if (signal_pending(current))
- count = -EINTR;
+ count = -ERESTARTNOHAND;
}
if (count || timed_out)
break;
@@ -965,7 +961,7 @@ static int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
struct timespec64 *end_time)
{
struct poll_wqueues table;
- int err = -EFAULT, fdcount, len, size;
+ int err = -EFAULT, fdcount, len;
/* Allocate small arguments on the stack to save memory and be
faster - use long to make sure the buffer is aligned properly
on 64 bit archs to avoid unaligned access */
@@ -993,8 +989,8 @@ static int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
break;
len = min(todo, POLLFD_PER_PAGE);
- size = sizeof(struct poll_list) + sizeof(struct pollfd) * len;
- walk = walk->next = kmalloc(size, GFP_KERNEL);
+ walk = walk->next = kmalloc(struct_size(walk, entries, len),
+ GFP_KERNEL);
if (!walk) {
err = -ENOMEM;
goto out_fds;
@@ -1041,7 +1037,7 @@ static long do_restart_poll(struct restart_block *restart_block)
ret = do_sys_poll(ufds, nfds, to);
- if (ret == -EINTR) {
+ if (ret == -ERESTARTNOHAND) {
restart_block->fn = do_restart_poll;
ret = -ERESTART_RESTARTBLOCK;
}
@@ -1062,7 +1058,7 @@ SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds,
ret = do_sys_poll(ufds, nfds, to);
- if (ret == -EINTR) {
+ if (ret == -ERESTARTNOHAND) {
struct restart_block *restart_block;
restart_block = &current->restart_block;
@@ -1086,7 +1082,6 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
struct __kernel_timespec __user *, tsp, const sigset_t __user *, sigmask,
size_t, sigsetsize)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -1099,20 +1094,12 @@ SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds,
return -EINVAL;
}
- ret = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_user_sigmask(sigmask, &sigsaved, ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
-
- ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
}
#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
@@ -1121,7 +1108,6 @@ SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds, unsigned int, nfds,
struct old_timespec32 __user *, tsp, const sigset_t __user *, sigmask,
size_t, sigsetsize)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -1134,20 +1120,12 @@ SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds, unsigned int, nfds,
return -EINVAL;
}
- ret = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_user_sigmask(sigmask, &sigsaved, ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
-
- ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
}
#endif
@@ -1284,9 +1262,7 @@ static int do_compat_select(int n, compat_ulong_t __user *inp,
}
ret = compat_core_sys_select(n, inp, outp, exp, to);
- ret = poll_select_copy_remaining(&end_time, tvp, PT_OLD_TIMEVAL, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tvp, PT_OLD_TIMEVAL, ret);
}
COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
@@ -1319,7 +1295,6 @@ static long do_compat_pselect(int n, compat_ulong_t __user *inp,
void __user *tsp, compat_sigset_t __user *sigmask,
compat_size_t sigsetsize, enum poll_time_type type)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -1342,15 +1317,12 @@ static long do_compat_pselect(int n, compat_ulong_t __user *inp,
return -EINVAL;
}
- ret = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_compat_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = compat_core_sys_select(n, inp, outp, exp, to);
- restore_user_sigmask(sigmask, &sigsaved, ret == -ERESTARTNOHAND);
- ret = poll_select_copy_remaining(&end_time, tsp, type, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, type, ret);
}
COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp,
@@ -1402,7 +1374,6 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds,
unsigned int, nfds, struct old_timespec32 __user *, tsp,
const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -1415,20 +1386,12 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds,
return -EINVAL;
}
- ret = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_compat_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_user_sigmask(sigmask, &sigsaved, ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
-
- ret = poll_select_copy_remaining(&end_time, tsp, PT_OLD_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret);
}
#endif
@@ -1437,7 +1400,6 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time64, struct pollfd __user *, ufds,
unsigned int, nfds, struct __kernel_timespec __user *, tsp,
const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
{
- sigset_t ksigmask, sigsaved;
struct timespec64 ts, end_time, *to = NULL;
int ret;
@@ -1450,20 +1412,12 @@ COMPAT_SYSCALL_DEFINE5(ppoll_time64, struct pollfd __user *, ufds,
return -EINVAL;
}
- ret = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ ret = set_compat_user_sigmask(sigmask, sigsetsize);
if (ret)
return ret;
ret = do_sys_poll(ufds, nfds, to);
-
- restore_user_sigmask(sigmask, &sigsaved, ret == -EINTR);
- /* We can restart this syscall, usually */
- if (ret == -EINTR)
- ret = -ERESTARTNOHAND;
-
- ret = poll_select_copy_remaining(&end_time, tsp, PT_TIMESPEC, ret);
-
- return ret;
+ return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret);
}
#endif
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-05 02:05:01 +0200