diff options
| author | Adam Borowski <kilobyte@angband.pl> | 2017-06-03 09:35:05 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-09 11:07:36 +0200 |
| commit | cc1e66f92bf52abfcb55bbb8d6f48fa7a922b7ce (patch) | |
| tree | 40f3b10b16219afe6e5b5f2f420f3988e979c9fd /drivers/tty/vt | |
| parent | 3c2993b8c6143d8a5793746a54eba8f86f95240f (diff) | |
vt: use copy_from/to_user instead of __get/put_user for scrnmap ioctls
Linus wants to get rid of these functions, and these uses are especially
egregious: they copy a big linear array element by element.
Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt')
| -rw-r--r-- | drivers/tty/vt/consolemap.c | 31 |
1 files changed, 7 insertions, 24 deletions
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c index 1f6e17fc3fb0..1361f2a8b832 100644 --- a/drivers/tty/vt/consolemap.c +++ b/drivers/tty/vt/consolemap.c @@ -322,15 +322,13 @@ int con_set_trans_old(unsigned char __user * arg) { int i; unsigned short inbuf[E_TABSZ]; + unsigned char ubuf[E_TABSZ]; - if (!access_ok(VERIFY_READ, arg, E_TABSZ)) + if (copy_from_user(ubuf, arg, E_TABSZ)) return -EFAULT; - for (i = 0; i < E_TABSZ ; i++) { - unsigned char uc; - __get_user(uc, arg+i); - inbuf[i] = UNI_DIRECT_BASE | uc; - } + for (i = 0; i < E_TABSZ ; i++) + inbuf[i] = UNI_DIRECT_BASE | ubuf[i]; console_lock(); memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); @@ -345,9 +343,6 @@ int con_get_trans_old(unsigned char __user * arg) unsigned short *p = translations[USER_MAP]; unsigned char outbuf[E_TABSZ]; - if (!access_ok(VERIFY_WRITE, arg, E_TABSZ)) - return -EFAULT; - console_lock(); for (i = 0; i < E_TABSZ ; i++) { @@ -356,22 +351,16 @@ int con_get_trans_old(unsigned char __user * arg) } console_unlock(); - for (i = 0; i < E_TABSZ ; i++) - __put_user(outbuf[i], arg+i); - return 0; + return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; } int con_set_trans_new(ushort __user * arg) { - int i; unsigned short inbuf[E_TABSZ]; - if (!access_ok(VERIFY_READ, arg, E_TABSZ*sizeof(unsigned short))) + if (copy_from_user(inbuf, arg, sizeof(inbuf))) return -EFAULT; - for (i = 0; i < E_TABSZ ; i++) - __get_user(inbuf[i], arg+i); - console_lock(); memcpy(translations[USER_MAP], inbuf, sizeof(inbuf)); update_user_maps(); @@ -381,19 +370,13 @@ int con_set_trans_new(ushort __user * arg) int con_get_trans_new(ushort __user * arg) { - int i; unsigned short outbuf[E_TABSZ]; - if (!access_ok(VERIFY_WRITE, arg, E_TABSZ*sizeof(unsigned short))) - return -EFAULT; - console_lock(); memcpy(outbuf, translations[USER_MAP], sizeof(outbuf)); console_unlock(); - for (i = 0; i < E_TABSZ ; i++) - __put_user(outbuf[i], arg+i); - return 0; + return copy_to_user(arg, outbuf, sizeof(outbuf)) ? -EFAULT : 0; } /* |