Messages in this thread | | | Subject | Re: [PATCH v2] ARM: socfpga: Fix crash with CONFIG_FORTIRY_SOURCE | From | Dinh Nguyen <> | Date | Thu, 18 Nov 2021 16:08:27 -0600 |
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Hi Iwai,
Should this have the following tag:
Fixes: 9c4566a117a6 ("ARM: socfpga: Enable SMP for socfpga")
As well?
On 11/18/21 8:25 AM, Takashi Iwai wrote: > When CONFIG_FORTIFY_SOURCE is set, memcpy() checks the potential > buffer overflow and panics. The code in sofcpga bootstrapping > contains the memcpy() calls are mistakenly translated as the shorter > size, hence it triggers a panic as if it were overflowing. > > This patch changes the secondary_trampoline and *_end definitions > to arrays for avoiding the false-positive crash above. > > Suggested-by: Kees Cook <keescook@chromium.org> > Buglink: https://bugzilla.suse.com/show_bug.cgi?id=1192473 > Link: https://lore.kernel.org/r/20211117193244.31162-1-tiwai@suse.de > Signed-off-by: Takashi Iwai <tiwai@suse.de> > --- > > v1->v2: Use arrays for trampoline area instead of hackish workaround > with __NO_FORTIFY > > arch/arm/mach-socfpga/core.h | 2 +- > arch/arm/mach-socfpga/platsmp.c | 8 ++++---- > 2 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h > index fc2608b18a0d..18f01190dcfd 100644 > --- a/arch/arm/mach-socfpga/core.h > +++ b/arch/arm/mach-socfpga/core.h > @@ -33,7 +33,7 @@ extern void __iomem *sdr_ctl_base_addr; > u32 socfpga_sdram_self_refresh(u32 sdr_base); > extern unsigned int socfpga_sdram_self_refresh_sz; > > -extern char secondary_trampoline, secondary_trampoline_end; > +extern char secondary_trampoline[], secondary_trampoline_end[]; > > extern unsigned long socfpga_cpu1start_addr; > > diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c > index fbb80b883e5d..201191cf68f3 100644 > --- a/arch/arm/mach-socfpga/platsmp.c > +++ b/arch/arm/mach-socfpga/platsmp.c > @@ -20,14 +20,14 @@ > > static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) > { > - int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; > + int trampoline_size = secondary_trampoline_end - secondary_trampoline; > > if (socfpga_cpu1start_addr) { > /* This will put CPU #1 into reset. */ > writel(RSTMGR_MPUMODRST_CPU1, > rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); > > - memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); > + memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size); > > writel(__pa_symbol(secondary_startup), > sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff)); > @@ -45,12 +45,12 @@ static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) > > static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle) > { > - int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; > + int trampoline_size = secondary_trampoline_end - secondary_trampoline; > > if (socfpga_cpu1start_addr) { > writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr + > SOCFPGA_A10_RSTMGR_MODMPURST); > - memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); > + memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size); > > writel(__pa_symbol(secondary_startup), > sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff)); >
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