Bug in getcwd() also in 4.11 kernel

[Chris Johns]

On 15/10/2014 3:09 am, Hoefle Marco wrote:
> Hello,
>
> getcwd() seems also buggy on an external  FAT12 image. On 4.11 there is
> no crash but this behavior:
>

Why FAT12 ?

Does FAT32 work ?

> RAM disks registered
>
> disk addr 1: 0x400c6fa0, size: 1000000
>
> disk addr 2: 0x40074060, size: 262144
>
> format /dev/rda done.
>
> mount return: 0
>
> mount return: 0
>
>                 Starting 1 threads...
>
> started thread 0: id: 0x0b010002, prio: 10
>
>   =========================
>
>   starting shell
>
>   =========================
>
> RTEMS SHELL (Ver.1.0-FRC):/dev/console. Oct 14 2014. 'help' to list
> commands.
>
> [/] #
>
> [/] #
>
> [/] #
>
> [/] # pwd
>
> /
>
> [/] # ls
>
> dev   mram  sdram
>
> [/] # cdhello dude, this is tick nr: 0
>
> [/] # cd mram
>
> hello dude, this is tick nr: 1
>
> [/mram] # cd template
>
> [/mram/template] # pwd
>
> /mram/template
>
> [/mram/template] # ls
>
> logs  param
>
> [/mram/template] #
>
> [/mram/template] # cd logs
>
> hello dude, this is tick nr: 0
>
> RAM disks registered
>
> disk addr 1: 0x400c6fa0, size: 1000000
>
> disk addr 2: 0x40074060, size: 262144
>
> format /dev/rda done.
>
> mount return: 0
>
> mount return: 0
>
>                 Starting 1 threads...
>
> started thread 0: id: 0x0b010002, prio: 10
>
>   =========================
>
>   starting shell
>
>   =========================
>
> RTEMS SHELL (Ver.1.0-FRC):/dev/console. Oct 14 2014. 'help' to list
> commands.
>
> [/] #
>
> [/] #
>
> [/] #
>
> [/] # pwd
>
> /
>
> [/] # ls
>
> dev   mram  sdram
>
>   [/] # cd mram
>
> [/mram] # cd template
>
> [/mram/template] # pwd
>
> /mram/template
>
> [/mram/template] # ls
>
> logs  param
>
> [/mram/template] #
>
> [/mram/template] # cd logs
>
> [?] # pwd
>
> �
>
> I’ll be happy to forward the test case to an rtems developer.
>

Please create a bug report for this and attach anything you think is 
important. The easier it is to reproduce the more chance someone will 
look into it.

Thanks
Chris

> This behavior occurs only when mounting an external fat12 image
> generated this way:
>
> NAME = libfatfsimg
>
> BUILDDIR = build
>
> all: $(NAME).a
>
> .PHONY: $(NAME).a
>
> $(NAME).o:
>
>        @echo [GEN FATFS] $@
>
>        @dd if=/dev/zero of=$(NAME) bs=256 count=1024 > /dev/null
>
>        /sbin/mkfs.vfat -F 12 -S 512 -s 1 -r 512 -f 1 -v $(NAME)
>
>        mcopy -b/ -i $(NAME) content/* ::/
>
>        @xxd -i $(NAME) > $(NAME).c
>
>        @echo [CC]  $@
>
>        @$(CC) -c $(CFLAGS) -o $@ $(NAME).c
>
> $(NAME).a: $(NAME).o
>
> @$(AR) rcs $@ $^
>
> The object file is then linked against the rtems test application.
>
> Marco
>
> ------------------------------------------------------------------------
>
> *From:*users [mailto:users-bounces at rtems.org] *On Behalf Of *Rohner Thomas
> *Sent:* Donnerstag, 2. Oktober 2014 12:11
> *To:* Joel Sherrill; rtems-users at rtems.org
> *Subject:* RE: Bug in getcwd()
>
> Hello,
>
>>  We have a system with the following configuration.
>
>>
>
>> Platform:
>
>>
>
>> ·Chip GR712RC
>
>>
>
>>  ·Board: GR712 Development Board
>
>>
>
>>  ·Compiler RTEMS RCC (according to your websites version)
>
>>
>
>>  ·RTOS: RTEMS
>
>>
>
>>  ·Library: GR-RTEMS-DRIVER Version 1.2.1.0
>
>>
>
> I’m using FAT as filesystem. We have same phenomenon for FAT12 or FAT16!
>
> Freundliche Grüsse / Kind regards,
>
> 	
>
> image001
>
> *Thomas Rohner*
>
> Entwicklungsingenieur Software
>
> nanoTRONIC GmbH
>
> Werkstrasse 27, CH - 3250 Lyss
>
> 	
>
> T: +41 32 384 69 30, F: +41 32 384 69 31
>
> www.nanotronic.ch <http://www.nanotronic.ch/> |
> thomas.rohner at nanotronic.ch <mailto:thomas.rohner at nanotronic.ch>
>
> *From:*Joel Sherrill [mailto:joel.sherrill at oarcorp.com]
> *Sent:* Mittwoch, 1. Oktober 2014 20:11
> *To:* Rohner Thomas; rtems-users at rtems.org
> *Subject:* Re: Bug in getcwd()
>
> On 10/1/2014 9:26 AM, Rohner Thomas wrote:
>
>     Hello,
>
>     maybe I found a bug in getcwd().
>
>     We’re using RTEMS 4.0 with Gaisler-Aeroflex….
>
>     With our libraries I get an erroneous string when directory-depth is
>     about 4 folders from root!
>
>     When I use this string to read directory it crahes!
>
>     Is there a limitation of string-length?
>
>     I get the same results for
>
>     Char buffer[200];
>
>     getcwd(buffer,sizeof(buffer));
>
>     or
>
>     char* ret = getcwd(NULL,0);
>
> Is this with the IMFS? What BSP?
>
> Can you put together a full test example so we can
> see what is really happening?
>
> There is a POSIX constant for PATH_MAX as I recall but
> it is quite large.
>
> Freundliche Grüsse / Kind regards,
>
> 	
>
> image001
>
> *Thomas Rohner*
>
> Entwicklungsingenieur Software
>
> nanoTRONIC GmbH
>
> Werkstrasse 27, CH - 3250 Lyss
>
> 	
>
> T: +41 32 384 69 30, F: +41 32 384 69 31
>
> www.nanotronic.ch <http://www.nanotronic.ch/> |
> thomas.rohner at nanotronic.ch <mailto:thomas.rohner at nanotronic.ch>
>
> --
>
> Joel Sherrill, Ph.D.             Director of Research & Development
>
> joel.sherrill at OARcorp.com  <mailto:joel.sherrill at OARcorp.com>         On-Line Applications Research
>
> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>
> Support Available                (256) 722-9985
>
>
>
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