Messages in this thread | | | Date | Wed, 6 Jan 2016 18:10:44 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH 3/5] x86: simplify early command line parsing |
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On Tue, Dec 22, 2015 at 02:52:41PM -0800, Dave Hansen wrote: > > From: Dave Hansen <dave.hansen@linux.intel.com> > > __cmdline_find_option_bool() tries to account for both > NULL-terminated and non-NULL-terminated strings. It keeps 'pos' > to look for the end of the buffer and also looks for '!c' in a > bunch of places to look for NULL termination. > > But, it also calls strlen(). You can't call strlen on a > non-NULL-terminated string. > > If !strlen(cmdline), then cmdline[0]=='\0'. In that case, we > will go in to the while() loop, set c='\0', hit st_wordstart, > notice !c, and will immediately return 0. > > So, remove the strlen(). It is unnecessary and unsafe. > > Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> > Cc: Borislav Petkov <bp@suse.de> > Cc: H. Peter Anvin <hpa@zytor.com> > Cc: linux-kernel@vger.kernel.org > Cc: fenghua.yu@intel.com > Cc: yu-cheng.yu@intel.com > --- > > b/arch/x86/lib/cmdline.c | 3 --- > 1 file changed, 3 deletions(-) > > diff -puN arch/x86/lib/cmdline.c~x86-early-command-line-non-term arch/x86/lib/cmdline.c > --- a/arch/x86/lib/cmdline.c~x86-early-command-line-non-term 2015-12-22 11:56:59.454186167 -0800 > +++ b/arch/x86/lib/cmdline.c 2015-12-22 11:56:59.457186302 -0800 > @@ -39,9 +39,6 @@ int cmdline_find_option_bool(const char > if (!cmdline) > return -1; /* No command line */ > > - if (!strlen(cmdline)) > - return 0; > -
Patch 1 adds the strlen(), this patch removes it. Please merge both patches.
-- Regards/Gruss, Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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