From: Takashi Iwai tiwai@suse.de
[ Upstream commit 187bea472600dcc8d2eb714335053264dd437172 ]
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.
Fixes: 9c4566a117a6 ("ARM: socfpga: Enable SMP for socfpga") 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 Signed-off-by: Dinh Nguyen dinguyen@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 5bc6ea87cdf74..1b41e23db98ef 100644 --- a/arch/arm/mach-socfpga/core.h +++ b/arch/arm/mach-socfpga/core.h @@ -44,7 +44,7 @@ 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 15c8ce8965f43..ff1d13d3ef72e 100644 --- a/arch/arm/mach-socfpga/platsmp.c +++ b/arch/arm/mach-socfpga/platsmp.c @@ -31,14 +31,14 @@
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(virt_to_phys(secondary_startup), sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff)); @@ -56,12 +56,12 @@ 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(virt_to_phys(secondary_startup), sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));