linux-kernel - Re: [PATCH] x86/tools/relocs: fix big section header tables

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Message-ID: <20181129152200.GA1776@shodan.usersys.redhat.com>
Date:   Thu, 29 Nov 2018 16:22:00 +0100
From:   Artem Savkov <asavkov@...hat.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/tools/relocs: fix big section header tables

On Thu, Nov 29, 2018 at 08:23:12AM -0600, Josh Poimboeuf wrote:
> On Thu, Nov 29, 2018 at 02:51:33PM +0100, Artem Savkov wrote:
> > In case when the number of entries in the section header table is larger
> > then or equal to SHN_LORESERVE the size of the table is held in the sh_size
> > member of the initial entry in section header table instead of e_shnum.
> > Same with the string table index which is located in sh_link instead of
> > e_shstrndx.
> > 
> > This case is easily reproducible with KCFLAGS="-ffunction-sections",
> > bzImage build fails with "String table index out of bounds" error.
> > 
> > Signed-off-by: Artem Savkov <asavkov@...hat.com>
> > ---
> >  arch/x86/tools/relocs.c | 58 +++++++++++++++++++++++++++++------------
> >  1 file changed, 41 insertions(+), 17 deletions(-)
> > 
> > diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
> > index b629f6992d9f..5275ea0a0d13 100644
> > --- a/arch/x86/tools/relocs.c
> > +++ b/arch/x86/tools/relocs.c
> > @@ -11,7 +11,9 @@
> >  #define Elf_Shdr		ElfW(Shdr)
> >  #define Elf_Sym			ElfW(Sym)
> >  
> > -static Elf_Ehdr ehdr;
> > +static Elf_Ehdr	ehdr;
> 
> I think there's a tab missing here, it doesn't line up with the other
> variables.

This seems to be a vim bug. It aligns perfectly in
cat/less/lore.kernel.org which all seem to use tabstop=8 by default, but
it does not align in vim, but it does align with tabstop=7 in vim.


-- 
 Artem