linux/arch/nios2/kernel
Tobias Klauser 921d701e6f nios2: reserve boot memory for device tree
Make sure to reserve the boot memory for the flattened device tree.
Otherwise it might get overwritten, e.g. when initial_boot_params is
copied, leading to a corrupted FDT and a boot hang/crash:

  bootconsole [early0] enabled
  Early console on uart16650 initialized at 0xf8001600
  OF: fdt: Error -11 processing FDT
  Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!

  ---[ end Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!

Guenter Roeck says:

> I think I found the problem. In unflatten_and_copy_device_tree(), with added
> debug information:
>
> OF: fdt: initial_boot_params=c861e400, dt=c861f000 size=28874 (0x70ca)
>
> ... and then initial_boot_params is copied to dt, which results in corrupted
> fdt since the memory overlaps. Looks like the initial_boot_params memory
> is not reserved and (re-)allocated by early_init_dt_alloc_memory_arch().

Cc: stable@vger.kernel.org
Reported-by: Guenter Roeck <linux@roeck-us.net>
Reference: http://lkml.kernel.org/r/20170226210338.GA19476@roeck-us.net
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
2017-04-02 20:13:57 -07:00
..
asm-offsets.c nios2: asm-offsets: Remove unused definition TI_TASK 2014-12-08 12:56:12 +08:00
cpuinfo.c nios2: use of_property_read_bool 2016-10-06 18:19:16 +08:00
early_printk.c nios2: add early printk support 2015-02-10 23:21:08 +08:00
entry.S nios2: rework trap handler 2015-04-20 11:11:14 +08:00
head.S nios2: Kernel booting and initialization 2014-12-08 12:55:49 +08:00
insnemu.S nios2: Traps exception handling 2014-12-08 12:55:50 +08:00
irq.c nios2: Interrupt handling 2014-12-08 12:55:55 +08:00
kgdb.c nios2: add kgdb support 2015-02-16 19:26:43 +08:00
Makefile nios2: add kgdb support 2015-02-16 19:26:43 +08:00
misaligned.c nios2: remove unused statistic counters 2015-09-08 01:32:34 +08:00
module.c module: remove mod arg from module_free, rename module_memfree(). 2015-01-20 11:38:33 +10:30
nios2_ksyms.c nios2: Build infrastructure 2014-12-08 12:56:06 +08:00
process.c sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
prom.c nios2: reserve boot memory for device tree 2017-04-02 20:13:57 -07:00
ptrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
setup.c nios2: reserve boot memory for device tree 2017-04-02 20:13:57 -07:00
signal.c nios2: signal: Move restart_block to struct task_struct 2015-04-08 13:45:16 +08:00
sys_nios2.c nios2: System calls handling 2014-12-08 12:55:58 +08:00
syscall_table.c nios2: System calls handling 2014-12-08 12:55:58 +08:00
time.c clocksource: Use a plain u64 instead of cycle_t 2016-12-25 11:04:12 +01:00
traps.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
vmlinux.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00