[PATCH 4.14 020/106] ARM: socfpga: Fix crash with CONFIG_FORTIRY_SOURCE

Greg Kroah-Hartman
2021-12-06T15:09:45Z

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 65e1817d8afe6..692a287a8712d 100644
--- a/arch/arm/mach-socfpga/core.h
+++ b/arch/arm/mach-socfpga/core.h
@@ -48,7 +48,7 @@ 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 0ee76772b5074..a272999ce04b9 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(__pa_symbol(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(__pa_symbol(secondary_startup),
sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
--
2.33.0