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Date: Fri, 1 Apr 2022 11:32:43 +0100 From: Liviu Dudau <liviu.dudau@....com> To: Sudeep Holla <sudeep.holla@....com> Cc: Kees Cook <keescook@...omium.org>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] ARM: vexpress/spc: Avoid negative array index when !SMP On Fri, Apr 01, 2022 at 11:11:47AM +0100, Sudeep Holla wrote: > On Fri, Apr 01, 2022 at 10:28:29AM +0100, Liviu Dudau wrote: > > On Thu, Mar 31, 2022 at 12:04:43PM -0700, Kees Cook wrote: > > > When building multi_v7_defconfig+CONFIG_SMP=n, -Warray-bounds exposes > > > a couple negative array index accesses: > > > > > > arch/arm/mach-vexpress/spc.c: In function 've_spc_clk_init': > > > arch/arm/mach-vexpress/spc.c:583:21: warning: array subscript -1 is below array bounds of 'bool[2]' {aka '_Bool[2]'} [-Warray-bounds] > > > 583 | if (init_opp_table[cluster]) > > > | ~~~~~~~~~~~~~~^~~~~~~~~ > > > arch/arm/mach-vexpress/spc.c:556:7: note: while referencing 'init_opp_table' > > > 556 | bool init_opp_table[MAX_CLUSTERS] = { false }; > > > | ^~~~~~~~~~~~~~ > > > arch/arm/mach-vexpress/spc.c:592:18: warning: array subscript -1 is below array bounds of 'bool[2]' {aka '_Bool[2]'} [-Warray-bounds] > > > 592 | init_opp_table[cluster] = true; > > > | ~~~~~~~~~~~~~~^~~~~~~~~ > > > arch/arm/mach-vexpress/spc.c:556:7: note: while referencing 'init_opp_table' > > > 556 | bool init_opp_table[MAX_CLUSTERS] = { false }; > > > | ^~~~~~~~~~~~~~ > > > > > > Skip this logic when built !SMP. > > > > > > Cc: Liviu Dudau <liviu.dudau@....com> > > > Cc: Sudeep Holla <sudeep.holla@....com> > > > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com> > > > Cc: Russell King <linux@...linux.org.uk> > > > Cc: linux-arm-kernel@...ts.infradead.org > > > Signed-off-by: Kees Cook <keescook@...omium.org> > > > > Acked-by: Liviu Dudau <liviu.dudau@....com> > > > > Sudeep, can you please take this through your tree for sending it to arm-soc? > > > > Sure, I will do that as soon as -rc1 is out. Cheers, much appreciated! Best regards, Liviu > > -- > Regards, > Sudeep -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯
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