Messages in this thread Patch in this message | | | From | Luis Araneda <> | Subject | [RFC PATCH] ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up | Date | Tue, 30 Jul 2019 00:43:26 -0400 |
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This fixes a kernel panic (read overflow) on memcpy when FORTIFY_SOURCE is enabled.
The computed size of memcpy args are: - p_size (dst): 4294967295 = (size_t) -1 - q_size (src): 1 - size (len): 8
Additionally, the memory is marked as __iomem, so one of the memcpy_* functions should be used for read/write
Signed-off-by: Luis Araneda <luaraneda@gmail.com> ---
For anyone trying to reproduce / debug this, it panics before the console has any output. I used JTAG to find the panic, but I had to comment-out the call to "zynq_slcr_cpu_stop" as it stops the JTAG interface and the connection is dropped, at least with OpenOCD.
I run-tested this on a Digilent Zybo Z7 board --- arch/arm/mach-zynq/platsmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c index a7cfe07156f4..407abade7336 100644 --- a/arch/arm/mach-zynq/platsmp.c +++ b/arch/arm/mach-zynq/platsmp.c @@ -57,7 +57,7 @@ int zynq_cpun_start(u32 address, int cpu) * 0x4: Jump by mov instruction * 0x8: Jumping address */ - memcpy((__force void *)zero, &zynq_secondary_trampoline, + memcpy_toio(zero, &zynq_secondary_trampoline, trampoline_size); writel(address, zero + trampoline_size); -- 2.22.0
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