Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/fs/select.c b/fs/select.c
index e517960..5edffee 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -97,7 +97,7 @@
struct poll_table_page {
struct poll_table_page * next;
struct poll_table_entry * entry;
- struct poll_table_entry entries[0];
+ struct poll_table_entry entries[];
};
#define POLL_TABLE_FULL(table) \
@@ -321,7 +321,7 @@
switch (pt_type) {
case PT_TIMEVAL:
{
- struct timeval rtv;
+ struct __kernel_old_timeval rtv;
if (sizeof(rtv) > sizeof(rtv.tv_sec) + sizeof(rtv.tv_usec))
memset(&rtv, 0, sizeof(rtv));
@@ -458,9 +458,11 @@
return max;
}
-#define POLLIN_SET (EPOLLRDNORM | EPOLLRDBAND | EPOLLIN | EPOLLHUP | EPOLLERR)
-#define POLLOUT_SET (EPOLLWRBAND | EPOLLWRNORM | EPOLLOUT | EPOLLERR)
-#define POLLEX_SET (EPOLLPRI)
+#define POLLIN_SET (EPOLLRDNORM | EPOLLRDBAND | EPOLLIN | EPOLLHUP | EPOLLERR |\
+ EPOLLNVAL)
+#define POLLOUT_SET (EPOLLWRBAND | EPOLLWRNORM | EPOLLOUT | EPOLLERR |\
+ EPOLLNVAL)
+#define POLLEX_SET (EPOLLPRI | EPOLLNVAL)
static inline void wait_key_set(poll_table *wait, unsigned long in,
unsigned long out, unsigned long bit,
@@ -527,6 +529,7 @@
break;
if (!(bit & all_bits))
continue;
+ mask = EPOLLNVAL;
f = fdget(i);
if (f.file) {
wait_key_set(wait, in, out, bit,
@@ -534,34 +537,34 @@
mask = vfs_poll(f.file, wait);
fdput(f);
- if ((mask & POLLIN_SET) && (in & bit)) {
- res_in |= bit;
- retval++;
- wait->_qproc = NULL;
- }
- if ((mask & POLLOUT_SET) && (out & bit)) {
- res_out |= bit;
- retval++;
- wait->_qproc = NULL;
- }
- if ((mask & POLLEX_SET) && (ex & bit)) {
- res_ex |= bit;
- retval++;
- wait->_qproc = NULL;
- }
- /* got something, stop busy polling */
- if (retval) {
- can_busy_loop = false;
- busy_flag = 0;
-
- /*
- * only remember a returned
- * POLL_BUSY_LOOP if we asked for it
- */
- } else if (busy_flag & mask)
- can_busy_loop = true;
-
}
+ if ((mask & POLLIN_SET) && (in & bit)) {
+ res_in |= bit;
+ retval++;
+ wait->_qproc = NULL;
+ }
+ if ((mask & POLLOUT_SET) && (out & bit)) {
+ res_out |= bit;
+ retval++;
+ wait->_qproc = NULL;
+ }
+ if ((mask & POLLEX_SET) && (ex & bit)) {
+ res_ex |= bit;
+ retval++;
+ wait->_qproc = NULL;
+ }
+ /* got something, stop busy polling */
+ if (retval) {
+ can_busy_loop = false;
+ busy_flag = 0;
+
+ /*
+ * only remember a returned
+ * POLL_BUSY_LOOP if we asked for it
+ */
+ } else if (busy_flag & mask)
+ can_busy_loop = true;
+
}
if (res_in)
*rinp = res_in;
@@ -698,10 +701,10 @@
}
static int kern_select(int n, fd_set __user *inp, fd_set __user *outp,
- fd_set __user *exp, struct timeval __user *tvp)
+ fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
{
struct timespec64 end_time, *to = NULL;
- struct timeval tv;
+ struct __kernel_old_timeval tv;
int ret;
if (tvp) {
@@ -720,7 +723,7 @@
}
SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
- fd_set __user *, exp, struct timeval __user *, tvp)
+ fd_set __user *, exp, struct __kernel_old_timeval __user *, tvp)
{
return kern_select(n, inp, outp, exp, tvp);
}
@@ -766,22 +769,38 @@
* which has a pointer to the sigset_t itself followed by a size_t containing
* the sigset size.
*/
+struct sigset_argpack {
+ sigset_t __user *p;
+ size_t size;
+};
+
+static inline int get_sigset_argpack(struct sigset_argpack *to,
+ struct sigset_argpack __user *from)
+{
+ // the path is hot enough for overhead of copy_from_user() to matter
+ if (from) {
+ if (!user_read_access_begin(from, sizeof(*from)))
+ return -EFAULT;
+ unsafe_get_user(to->p, &from->p, Efault);
+ unsafe_get_user(to->size, &from->size, Efault);
+ user_read_access_end();
+ }
+ return 0;
+Efault:
+ user_access_end();
+ return -EFAULT;
+}
+
SYSCALL_DEFINE6(pselect6, int, n, fd_set __user *, inp, fd_set __user *, outp,
fd_set __user *, exp, struct __kernel_timespec __user *, tsp,
void __user *, sig)
{
- size_t sigsetsize = 0;
- sigset_t __user *up = NULL;
+ struct sigset_argpack x = {NULL, 0};
- if (sig) {
- if (!access_ok(sig, sizeof(void *)+sizeof(size_t))
- || __get_user(up, (sigset_t __user * __user *)sig)
- || __get_user(sigsetsize,
- (size_t __user *)(sig+sizeof(void *))))
- return -EFAULT;
- }
+ if (get_sigset_argpack(&x, sig))
+ return -EFAULT;
- return do_pselect(n, inp, outp, exp, tsp, up, sigsetsize, PT_TIMESPEC);
+ return do_pselect(n, inp, outp, exp, tsp, x.p, x.size, PT_TIMESPEC);
}
#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
@@ -790,18 +809,12 @@
fd_set __user *, exp, struct old_timespec32 __user *, tsp,
void __user *, sig)
{
- size_t sigsetsize = 0;
- sigset_t __user *up = NULL;
+ struct sigset_argpack x = {NULL, 0};
- if (sig) {
- if (!access_ok(sig, sizeof(void *)+sizeof(size_t))
- || __get_user(up, (sigset_t __user * __user *)sig)
- || __get_user(sigsetsize,
- (size_t __user *)(sig+sizeof(void *))))
- return -EFAULT;
- }
+ if (get_sigset_argpack(&x, sig))
+ return -EFAULT;
- return do_pselect(n, inp, outp, exp, tsp, up, sigsetsize, PT_OLD_TIMESPEC);
+ return do_pselect(n, inp, outp, exp, tsp, x.p, x.size, PT_OLD_TIMESPEC);
}
#endif
@@ -810,7 +823,7 @@
struct sel_arg_struct {
unsigned long n;
fd_set __user *inp, *outp, *exp;
- struct timeval __user *tvp;
+ struct __kernel_old_timeval __user *tvp;
};
SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg)
@@ -826,7 +839,7 @@
struct poll_list {
struct poll_list *next;
int len;
- struct pollfd entries[0];
+ struct pollfd entries[];
};
#define POLLFD_PER_PAGE ((PAGE_SIZE-sizeof(struct poll_list)) / sizeof(struct pollfd))
@@ -1001,14 +1014,17 @@
fdcount = do_poll(head, &table, end_time);
poll_freewait(&table);
+ if (!user_write_access_begin(ufds, nfds * sizeof(*ufds)))
+ goto out_fds;
+
for (walk = head; walk; walk = walk->next) {
struct pollfd *fds = walk->entries;
int j;
- for (j = 0; j < walk->len; j++, ufds++)
- if (__put_user(fds[j].revents, &ufds->revents))
- goto out_fds;
+ for (j = walk->len; j; fds++, ufds++, j--)
+ unsafe_put_user(fds->revents, &ufds->revents, Efault);
}
+ user_write_access_end();
err = fdcount;
out_fds:
@@ -1020,6 +1036,11 @@
}
return err;
+
+Efault:
+ user_write_access_end();
+ err = -EFAULT;
+ goto out_fds;
}
static long do_restart_poll(struct restart_block *restart_block)
@@ -1323,24 +1344,37 @@
return poll_select_finish(&end_time, tsp, type, ret);
}
+struct compat_sigset_argpack {
+ compat_uptr_t p;
+ compat_size_t size;
+};
+static inline int get_compat_sigset_argpack(struct compat_sigset_argpack *to,
+ struct compat_sigset_argpack __user *from)
+{
+ if (from) {
+ if (!user_read_access_begin(from, sizeof(*from)))
+ return -EFAULT;
+ unsafe_get_user(to->p, &from->p, Efault);
+ unsafe_get_user(to->size, &from->size, Efault);
+ user_read_access_end();
+ }
+ return 0;
+Efault:
+ user_access_end();
+ return -EFAULT;
+}
+
COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp,
compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
struct __kernel_timespec __user *, tsp, void __user *, sig)
{
- compat_size_t sigsetsize = 0;
- compat_uptr_t up = 0;
+ struct compat_sigset_argpack x = {0, 0};
- if (sig) {
- if (!access_ok(sig,
- sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
- __get_user(up, (compat_uptr_t __user *)sig) ||
- __get_user(sigsetsize,
- (compat_size_t __user *)(sig+sizeof(up))))
- return -EFAULT;
- }
+ if (get_compat_sigset_argpack(&x, sig))
+ return -EFAULT;
- return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
- sigsetsize, PT_TIMESPEC);
+ return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(x.p),
+ x.size, PT_TIMESPEC);
}
#if defined(CONFIG_COMPAT_32BIT_TIME)
@@ -1349,20 +1383,13 @@
compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
struct old_timespec32 __user *, tsp, void __user *, sig)
{
- compat_size_t sigsetsize = 0;
- compat_uptr_t up = 0;
+ struct compat_sigset_argpack x = {0, 0};
- if (sig) {
- if (!access_ok(sig,
- sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
- __get_user(up, (compat_uptr_t __user *)sig) ||
- __get_user(sigsetsize,
- (compat_size_t __user *)(sig+sizeof(up))))
- return -EFAULT;
- }
+ if (get_compat_sigset_argpack(&x, sig))
+ return -EFAULT;
- return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
- sigsetsize, PT_OLD_TIMESPEC);
+ return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(x.p),
+ x.size, PT_OLD_TIMESPEC);
}
#endif