On Tuesday, June 21, 2016 10:43:19 AM CEST Arnd Bergmann wrote: > On Tuesday, June 21, 2016 2:39:05 PM CEST Seung-Woo Kim wrote: > > To enable UBSAN on arm, this patch enables ARCH_HAS_UBSAN_SANITIZE_ALL > > from arm confiuration. Basic kernel booting is tested on arm kernel > > enabled CONFIG_UBSAN_SANITIZE_ALL from Exynos5422 based Odroid-XU3 > > board. > > > > Signed-off-by: Seung-Woo Kim <sw0312....@samsung.com> > > --- > > Because I tested only with specific soc board, so I am not sure the ubsan is > > fine for all other cases. So, I send this patch as a RFC. > > > > I've tried this out on my build test box in the past, but ran into > some problems. In particular I ended up disabling > -fsanitize=signed-integer-overflow and -fsanitize=object-size > and later reverting the whole thing, but don't remember exactly > why (possibly I was hitting internal compiler errors?).' > > Let me re-enable it with your patch locally and report back > with whatever build problems I run into.
This is what I have run into so far, during a few dozen randconfig builds, this is with "arm-linux-gnueabi-gcc (GCC) 6.0.0 20160323 (experimental)" and I can try building a newer version if you think that helps. I left the duplicates in to show what happens how often: ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1080 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../drivers/media/dvb-frontends/mb86a16.c: In function 'mb86a16_set_fe': ../drivers/media/dvb-frontends/mb86a16.c:1522:1: error: the frame size of 1096 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../drivers/net/wireless/realtek/rtlwifi/rtl8723be/hw.c: In function '_rtl8723be_read_adapter_info.constprop': ../drivers/net/wireless/realtek/rtlwifi/rtl8723be/hw.c:2243:1: error: the frame size of 1032 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../drivers/gpu/drm/radeon/si_dpm.c: In function 'si_init_dte_leakage_table.constprop': ../drivers/gpu/drm/radeon/si_dpm.c:2614:1: error: the frame size of 1096 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] drivers/media/built-in.o: In function `zl10353_calc_nominal_rate': tea575x.c:(.text+0x1caa94): undefined reference to `____ilog2_NaN' tea575x.c:(.text+0x1cafc8): undefined reference to `__aeabi_uldivmod' tea575x.c:(.text+0x1cb02c): undefined reference to `__aeabi_uldivmod' tea575x.c:(.text+0x1cb09c): undefined reference to `__aeabi_uldivmod' tea575x.c:(.text+0x1cb2d4): undefined reference to `__aeabi_uldivmod' tea575x.c:(.text+0x1cb3a8): undefined reference to `__aeabi_uldivmod' drivers/media/built-in.o:tea575x.c:(.text+0x1cb410): more undefined references to `__aeabi_uldivmod' follow ../drivers/video/fbdev/aty/atyfb_base.c: In function 'aty_bl_update_status': ../drivers/video/fbdev/aty/atyfb_base.c:167:33: error: array subscript is above array bounds [-Werror=array-bounds] return aty_ld_le32(lt_lcd_regs[index], par); ~~~~~~~~~~~^~~~~~~ ../drivers/video/fbdev/aty/atyfb_base.c:152:26: error: array subscript is above array bounds [-Werror=array-bounds] aty_st_le32(lt_lcd_regs[index], val, par); ../drivers/gpu/drm/radeon/si_dpm.c: In function 'si_init_dte_leakage_table.constprop': ../drivers/gpu/drm/radeon/si_dpm.c:2614:1: error: the frame size of 1096 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] ../drivers/video/fbdev/aty/atyfb_base.c: In function 'aty_bl_update_status': ../drivers/video/fbdev/aty/atyfb_base.c:167:33: error: array subscript is above array bounds [-Werror=array-bounds] return aty_ld_le32(lt_lcd_regs[index], par); ~~~~~~~~~~~^~~~~~~ ../drivers/video/fbdev/aty/atyfb_base.c:152:26: error: array subscript is above array bounds [-Werror=array-bounds] aty_st_le32(lt_lcd_regs[index], val, par); ../crypto/serpent_generic.c: In function '__serpent_setkey': ../crypto/serpent_generic.c:436:1: error: the frame size of 1080 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] Some warnings go away after I turn off -fsanitize=signed-integer-overflow and -fsanitize=object-size, but the one in crypto/serpent_generic.c remains unchanged. Arnd