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Sun, 10 Jan 2021 18:05:45 -0800 (PST) Date: Sun, 10 Jan 2021 19:05:43 -0700 From: Nathan Chancellor To: Alexander Lobakin Cc: Thomas Bogendoerfer , Arnd Bergmann , Nick Desaulniers , Huacai Chen , Pei Huang , Kees Cook , Fangrui Song , Jiaxun Yang , Ralf Baechle , Corey Minyard , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, stable@vger.kernel.org, clang-built-linux@googlegroups.com Subject: Re: [PATCH v5 mips-next 8/9] vmlinux.lds.h: catch UBSAN's "unnamed data" into data Message-ID: <20210111020543.GB2918900@ubuntu-m3-large-x86> References: <20210110115245.30762-1-alobakin@pm.me> <20210110115546.30970-1-alobakin@pm.me> <20210110115546.30970-8-alobakin@pm.me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210110115546.30970-8-alobakin@pm.me> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jan 10, 2021 at 11:56:54AM +0000, Alexander Lobakin wrote: > When building kernel with both LD_DEAD_CODE_DATA_ELIMINATION and > UBSAN, LLVM stack generates lots of "unnamed data" sections: > > ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_2) > is being placed in '.data.$__unnamed_2' > ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_3) > is being placed in '.data.$__unnamed_3' > ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_4) > is being placed in '.data.$__unnamed_4' > ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_5) > is being placed in '.data.$__unnamed_5' > > [...] > > Also handle this by adding the related sections to generic definitions. > > Signed-off-by: Alexander Lobakin Reviewed-by: Nathan Chancellor > --- > include/asm-generic/vmlinux.lds.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h > index 5f2f5b1db84f..cc659e77fcb0 100644 > --- a/include/asm-generic/vmlinux.lds.h > +++ b/include/asm-generic/vmlinux.lds.h > @@ -95,7 +95,7 @@ > */ > #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION > #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* > -#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* > +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* > #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* > #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* > #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* > -- > 2.30.0 > >