Dmitry Antipov <dmantipov@xxxxxxxxx> writes: > When compiling with clang 16.0.6 and CONFIG_FORTIFY_SOURCE=y, I've > noticed the following (somewhat confusing due to absence of an actual > source code location): > > In file included from drivers/net/wireless/ath/ath9k/debug.c:17: > In file included from ./include/linux/slab.h:16: > In file included from ./include/linux/gfp.h:7: > In file included from ./include/linux/mmzone.h:8: > In file included from ./include/linux/spinlock.h:56: > In file included from ./include/linux/preempt.h:79: > In file included from ./arch/x86/include/asm/preempt.h:9: > In file included from ./include/linux/thread_info.h:60: > In file included from ./arch/x86/include/asm/thread_info.h:53: > In file included from ./arch/x86/include/asm/cpufeature.h:5: > In file included from ./arch/x86/include/asm/processor.h:23: > In file included from ./arch/x86/include/asm/msr.h:11: > In file included from ./arch/x86/include/asm/cpumask.h:5: > In file included from ./include/linux/cpumask.h:12: > In file included from ./include/linux/bitmap.h:11: > In file included from ./include/linux/string.h:254: > ./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field' > declared with 'warning' attribute: detected read beyond size of field (2nd > parameter); maybe use struct_group()? [-Wattribute-warning] > __read_overflow2_field(q_size_field, size); > > In file included from drivers/net/wireless/ath/ath9k/htc_drv_debug.c:17: > In file included from drivers/net/wireless/ath/ath9k/htc.h:20: > In file included from ./include/linux/module.h:13: > In file included from ./include/linux/stat.h:19: > In file included from ./include/linux/time.h:60: > In file included from ./include/linux/time32.h:13: > In file included from ./include/linux/timex.h:67: > In file included from ./arch/x86/include/asm/timex.h:5: > In file included from ./arch/x86/include/asm/processor.h:23: > In file included from ./arch/x86/include/asm/msr.h:11: > In file included from ./arch/x86/include/asm/cpumask.h:5: > In file included from ./include/linux/cpumask.h:12: > In file included from ./include/linux/bitmap.h:11: > In file included from ./include/linux/string.h:254: > ./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field' > declared with 'warning' attribute: detected read beyond size of field (2nd > parameter); maybe use struct_group()? [-Wattribute-warning] > __read_overflow2_field(q_size_field, size); > > The compiler actually complains on 'ath9k_get_et_strings()' and > 'ath9k_htc_get_et_strings()' due to the same reason: fortification logic > inteprets call to 'memcpy()' as an attempt to copy the whole array from > it's first member and so issues an overread warning. These warnings may > be silenced by passing an address of the whole array and not the first > member to 'memcpy()'. > > Signed-off-by: Dmitry Antipov <dmantipov@xxxxxxxxx> Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxx>
