From c658eb981bfc302aafe5be6e4118a9c0a3f1735e Mon Sep 17 00:00:00 2001 From: Zhibin Li <08826794brmt@gmail.com> Date: Wed, 1 Aug 2018 17:53:57 +0800 Subject: [PATCH 02/27] evdev: fix decoding of EVIOCGBIT(0, ...) There is a comment in drivers/input/evdev.c which says: /* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */ That is, EVIOCGBIT(0, ...) should return a bit mask with supported event types instead of SYN_* event codes. * defs.h (evdev_ev): New prototype. * evdev.c: Include "xlat/evdev_ev.h" and remove "xlat/evdev_sync.h". (bit_ioctl) : Replace EV_SYN with 0, use evdev_ev with XT_SORTED in decode_bitset invocation instead. * ioctl.c: Do not include "xlat/evdev_ev.h". (evdev_decode_number): Print nr == 0x20 as "0" instead of "EV_SYN". * tests/ioctl_evdev.c (main): Use 0 instead of EV_SYN in EVIOCGBIT output. * xlat/evdev_sync.in: Remove. Additional changes: xlat/evdev_ev.h (auto-generated from xlat/evdev_ev.in) Co-Authored-by: Dmitry V. Levin Fixes: v4.10~89 "Add decoding for evdev ioctls" --- defs.h | 1 + evdev.c | 8 ++++---- ioctl.c | 7 ++++--- tests/ioctl_evdev.c | 2 +- xlat/evdev_sync.in | 5 ----- 5 files changed, 10 insertions(+), 13 deletions(-) delete mode 100644 xlat/evdev_sync.in Index: strace-4.24/defs.h =================================================================== --- strace-4.24.orig/defs.h 2019-03-11 12:34:15.719549018 +0100 +++ strace-4.24/defs.h 2019-03-11 12:47:05.976567233 +0100 @@ -330,6 +330,7 @@ /** Number of elements in evdev_abs array without the terminating record. */ extern const size_t evdev_abs_size; +extern const struct xlat evdev_ev[]; extern const struct xlat iffflags[]; extern const struct xlat ip_type_of_services[]; extern const struct xlat ipc_private[]; Index: strace-4.24/evdev.c =================================================================== --- strace-4.24.orig/evdev.c 2019-03-11 12:34:21.911484926 +0100 +++ strace-4.24/evdev.c 2019-03-11 12:47:05.976567233 +0100 @@ -30,6 +30,7 @@ #include "defs.h" #include "xlat/evdev_abs.h" +#include "xlat/evdev_ev.h" #ifdef HAVE_LINUX_INPUT_H @@ -47,7 +48,6 @@ # include "xlat/evdev_relative_axes.h" # include "xlat/evdev_snd.h" # include "xlat/evdev_switch.h" -# include "xlat/evdev_sync.h" # ifndef SYN_MAX # define SYN_MAX 0xf @@ -258,9 +258,9 @@ const kernel_ulong_t arg) { switch (ev_nr) { - case EV_SYN: - return decode_bitset(tcp, arg, evdev_sync, - SYN_MAX, "SYN_???", XT_INDEXED); + case 0: + return decode_bitset(tcp, arg, evdev_ev, + EV_MAX, "EV_???", XT_SORTED); case EV_KEY: return decode_bitset(tcp, arg, evdev_keycode, KEY_MAX, "KEY_???", XT_INDEXED); Index: strace-4.24/ioctl.c =================================================================== --- strace-4.24.orig/ioctl.c 2019-03-11 12:34:15.719549018 +0100 +++ strace-4.24/ioctl.c 2019-03-11 12:47:05.976567233 +0100 @@ -33,8 +33,6 @@ #include #include "xlat/ioctl_dirs.h" -#include "xlat/evdev_ev.h" - static int compare(const void *a, const void *b) { @@ -99,7 +97,10 @@ if (nr >= 0x20 && nr <= 0x20 + 0x1f) { tprints("EVIOCGBIT("); - printxval(evdev_ev, nr - 0x20, "EV_???"); + if (nr == 0x20) + tprintf("0"); + else + printxval(evdev_ev, nr - 0x20, "EV_???"); tprintf(", %u)", _IOC_SIZE(code)); return 1; } else if (nr >= 0x40 && nr <= 0x40 + 0x3f) { Index: strace-4.24/tests/ioctl_evdev.c =================================================================== --- strace-4.24.orig/tests/ioctl_evdev.c 2019-03-11 12:34:15.719549018 +0100 +++ strace-4.24/tests/ioctl_evdev.c 2019-03-11 12:47:05.977567222 +0100 @@ -138,7 +138,7 @@ TEST_NULL_ARG_EX(EVIOCGABS(0x3f), "EVIOCGABS(0x3f /* ABS_??? */)"); TEST_NULL_ARG_EX(EVIOCSABS(0x3f), "EVIOCSABS(0x3f /* ABS_??? */)"); - TEST_NULL_ARG(EVIOCGBIT(EV_SYN, 0)); + TEST_NULL_ARG(EVIOCGBIT(0, 0)); TEST_NULL_ARG(EVIOCGBIT(EV_KEY, 1)); TEST_NULL_ARG(EVIOCGBIT(EV_REL, 2)); TEST_NULL_ARG(EVIOCGBIT(EV_ABS, 3)); Index: strace-4.24/xlat/evdev_sync.in =================================================================== --- strace-4.24.orig/xlat/evdev_sync.in 2019-03-11 12:34:15.719549018 +0100 +++ /dev/null 1970-01-01 00:00:00.000000000 +0000 @@ -1,5 +0,0 @@ -#value_indexed -SYN_REPORT 0 -SYN_CONFIG 1 -SYN_MT_REPORT 2 -SYN_DROPPED 3 Index: strace-4.24/xlat/evdev_ev.h =================================================================== --- strace-4.24.orig/xlat/evdev_ev.h 2018-08-14 02:44:11.000000000 +0200 +++ strace-4.24/xlat/evdev_ev.h 2019-03-11 12:48:32.390670458 +0100 @@ -90,13 +90,8 @@ #ifndef XLAT_MACROS_ONLY -# ifdef IN_MPERS +# ifndef IN_MPERS -# error static const struct xlat evdev_ev in mpers mode - -# else - -static const struct xlat evdev_ev[] = { XLAT(EV_SYN), XLAT(EV_KEY),