I think this is the same patch: https://lore.kernel.org/linux-hardening/YxKO%2FjY1x0xTpl4r@work/ It's actually in linux-next. -- Gustavo On Thu, Jan 05, 2023 at 02:01:53PM -0800, Kees Cook wrote: > Zero-length arrays are deprecated[1]. Replace struct ethtool_rxnfc's > "rule_locs" 0-length array with a flexible array. Detected with GCC 13, > using -fstrict-flex-arrays=3: > > In file included from include/asm-generic/memory_model.h:5, > from arch/x86/include/asm/page.h:86, > from arch/x86/include/asm/thread_info.h:12, > from include/linux/thread_info.h:60, > from arch/x86/include/asm/preempt.h:9, > from include/linux/preempt.h:78, > from include/linux/spinlock.h:56, > from include/linux/mmzone.h:8, > from include/linux/gfp.h:7, > from include/linux/mm.h:7, > from mm/sparse-vmemmap.c:21: > In function 'reuse_compound_section', > inlined from 'vmemmap_populate_compound_pages' at mm/sparse-vmemmap.c:407:6, > inlined from '__populate_section_memmap' at mm/sparse-vmemmap.c:463:7: > mm/sparse-vmemmap.c:376:39: warning: array subscript <unknown> is outside array bounds of 'struct range[0]' [-Warray-bounds=] > 376 | PHYS_PFN(pgmap->ranges[pgmap->nr_range].start); > | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ > include/linux/pfn.h:22:43: note: in definition of macro 'PHYS_PFN' > 22 | #define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) > | ^ > In file included from include/linux/mm.h:31: > include/linux/memremap.h: In function '__populate_section_memmap': > include/linux/memremap.h:138:30: note: while referencing 'ranges' > 138 | struct range ranges[0]; > | ^~~~~~ > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Cc: Alex Sierra <alex.sierra@xxxxxxx> > Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx> > Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> > Cc: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> > Cc: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx> > Cc: linux-mm@xxxxxxxxx > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > include/linux/memremap.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/memremap.h b/include/linux/memremap.h > index 7fcaf3180a5b..1314d9c5f05b 100644 > --- a/include/linux/memremap.h > +++ b/include/linux/memremap.h > @@ -135,7 +135,7 @@ struct dev_pagemap { > int nr_range; > union { > struct range range; > - struct range ranges[0]; > + DECLARE_FLEX_ARRAY(struct range, ranges); > }; > }; > > -- > 2.34.1 >
