[U-Boot] Issue in u-boot; TFTP error: trying to overwrite reserved memory...
Hello together,
I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet.
I found an issue with one of the commit made in the early 2019,
http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the *lmb_get_free_size(&lmb, load_addr); *returns 0, no matter what.
And it triggers the following error,
*TFTP error: trying to overwrite reserved memory...*
I did a quick fix by adding *#undef CONFIG_LMB* in the file, *net/tftp.c*
So, I would like to know why this doesn’t work as it was working before applying this patch ?
Best regards, *Moses Christopher*
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet. I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c So, I would like to know why this doesn’t work as it was working before applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
The lmb code works by getting the RAM size, adding reserved areas and then only allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables. There's possibly something wrong in your configuration around that.
Regards, Simon
Best regards, Moses Christopher
Hi Simon,
Thanks for the prompt reply.
On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, < simon.k.r.goldschmidt@gmail.com> wrote:
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried to boot
via usb-ethernet.
I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb,
load_addr); returns 0, no matter what.
And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c So, I would like to know why this doesn’t work as it was working before
applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
I did add DEBUG macro to lmb.c but the function having the debug messages isn't getting called. I suppose it was from fs/fs.c
FYI, I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the environment is not stored separately, neither the device tree.
The lmb code works by getting the RAM size, adding reserved areas and then only allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables. There's possibly something wrong in your configuration around that.
Because, earlier to this patch, net/tftp.c isn't actually checking for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it.
Could you kindly provide me some information, where I can read more about the reserved memory regions and how exactly some region is treated as reserved region ?
Also, it'd be great if you could provide some information related to the configuration of Reserved and free addresses of RAM.
Thank you for your patience and time.
Regards, Simon
Best regards, Moses Christopher
Best regards, Moses Christopher
On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher moseschristopherb@gmail.com wrote:
Hi Simon,
Thanks for the prompt reply.
On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, simon.k.r.goldschmidt@gmail.com wrote:
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet. I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c So, I would like to know why this doesn’t work as it was working before applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
I did add DEBUG macro to lmb.c but the function having the debug messages isn't getting called. I suppose it was from fs/fs.c
Right, tftp.c is missing the call to that funcftion. Could you add the call to 'lmb_dump_all(&lmb);' right below 'lmb_init_and_reserve()' in tftp.c?
That should give you the output required. And while at it, tell us what 'load_addr' is set to (by adding a printf in tftp.c, too).
Thanks, Simon
FYI, I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the environment is not stored separately, neither the device tree.
The lmb code works by getting the RAM size, adding reserved areas and then only allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables. There's possibly something wrong in your configuration around that.
Because, earlier to this patch, net/tftp.c isn't actually checking for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it.
Could you kindly provide me some information, where I can read more about the reserved memory regions and how exactly some region is treated as reserved region ?
Also, it'd be great if you could provide some information related to the configuration of Reserved and free addresses of RAM.
Thank you for your patience and time.
Regards, Simon
Best regards, Moses Christopher
Best regards, Moses Christopher
On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, < simon.k.r.goldschmidt@gmail.com> wrote:
On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher moseschristopherb@gmail.com wrote:
Hi Simon,
Thanks for the prompt reply.
On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, <
simon.k.r.goldschmidt@gmail.com> wrote:
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried to
boot via usb-ethernet.
I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb,
load_addr); returns 0, no matter what.
And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c So, I would like to know why this doesn’t work as it was working
before applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
I did add DEBUG macro to lmb.c but the function having the debug
messages isn't getting called. I suppose it was from fs/fs.c
Right, tftp.c is missing the call to that funcftion. Could you add the call to 'lmb_dump_all(&lmb);' right below 'lmb_init_and_reserve()' in tftp.c?
That should give you the output required. And while at it, tell us what 'load_addr' is set to (by adding a printf in tftp.c, too).
Thanks, Simon
Thanks for your patience and time.
Please find the log below,
DHCP client bound to address 172.17.0.2 (1285 ms)
Using usb_ether device
TFTP from server 172.17.0.1; our IP address is 172.17.0.2
Filename 'u-boot.img'.
*lmb_dump_all:*
* memory.cnt = 0x0*
* memory.size = 0xx*
* reserved.cnt = 0x0*
* reserved.size = 0xx*
*load_addr: 0x82000000*
TFTP error: trying to overwrite reserved memory...
Problem booting with BOOTP
*In my u-boot it shows the DRAM size properly as 256MiB*
*So, do I need to configure my RAM size in SPL stage as well, such that SPL is aware of the memory size ?*
FYI, I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the
environment is not stored separately, neither the device tree.
The lmb code works by getting the RAM size, adding reserved areas and
then only
allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables. There's
possibly
something wrong in your configuration around that.
Because, earlier to this patch, net/tftp.c isn't actually checking for
the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it.
Could you kindly provide me some information, where I can read more
about the reserved memory regions and how exactly some region is treated as reserved region ?
Also, it'd be great if you could provide some information related to the
configuration of Reserved and free addresses of RAM.
Thank you for your patience and time.
Regards, Simon
Best regards, Moses Christopher
Best regards, Moses Christopher
On Wed, Sep 11, 2019 at 11:44 AM Moses Christopher moseschristopherb@gmail.com wrote:
On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, simon.k.r.goldschmidt@gmail.com wrote:
On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher moseschristopherb@gmail.com wrote:
Hi Simon,
Thanks for the prompt reply.
On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, simon.k.r.goldschmidt@gmail.com wrote:
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet. I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c So, I would like to know why this doesn’t work as it was working before applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
I did add DEBUG macro to lmb.c but the function having the debug messages isn't getting called. I suppose it was from fs/fs.c
Right, tftp.c is missing the call to that funcftion. Could you add the call to 'lmb_dump_all(&lmb);' right below 'lmb_init_and_reserve()' in tftp.c?
That should give you the output required. And while at it, tell us what 'load_addr' is set to (by adding a printf in tftp.c, too).
Thanks, Simon
Thanks for your patience and time.
Please find the log below,
DHCP client bound to address 172.17.0.2 (1285 ms)
Using usb_ether device
TFTP from server 172.17.0.1; our IP address is 172.17.0.2
Filename 'u-boot.img'.
lmb_dump_all:
memory.cnt = 0x0 memory.size = 0xx reserved.cnt = 0x0 reserved.size = 0xxload_addr: 0x82000000
TFTP error: trying to overwrite reserved memory...
Problem booting with BOOTP
In my u-boot it shows the DRAM size properly as 256MiB
So, do I need to configure my RAM size in SPL stage as well, such that SPL is aware of the memory size ?
Ehrm, are you doing this from SPL?
You need the RAM size for 'lmb_init_and_reserve()' to read, yes. Otherwise it can't know where to safely allocate things.
Regards, Simon
FYI, I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the environment is not stored separately, neither the device tree.
The lmb code works by getting the RAM size, adding reserved areas and then only allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables. There's possibly something wrong in your configuration around that.
Because, earlier to this patch, net/tftp.c isn't actually checking for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it.
Could you kindly provide me some information, where I can read more about the reserved memory regions and how exactly some region is treated as reserved region ?
Also, it'd be great if you could provide some information related to the configuration of Reserved and free addresses of RAM.
Thank you for your patience and time.
Regards, Simon
Best regards, Moses Christopher
Best regards, Moses Christopher
On Wed, 11 Sep, 2019, 4:43 PM Simon Goldschmidt, < simon.k.r.goldschmidt@gmail.com> wrote:
On Wed, Sep 11, 2019 at 11:44 AM Moses Christopher moseschristopherb@gmail.com wrote:
On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, <
simon.k.r.goldschmidt@gmail.com> wrote:
On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher moseschristopherb@gmail.com wrote:
Hi Simon,
Thanks for the prompt reply.
On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, <
simon.k.r.goldschmidt@gmail.com> wrote:
Hi,
On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher moseschristopherb@gmail.com wrote:
Hello together,
I was trying to build u-boot and spl for the arm target and tried
to boot via usb-ethernet.
I found an issue with one of the commit made in the early 2019, http://patchwork.ozlabs.org/patch/1024795/
When using this CONFIG_LMB the max_size or the
lmb_get_free_size(&lmb, load_addr); returns 0, no matter what.
And it triggers the following error, TFTP error: trying to overwrite reserved memory... I did a quick fix by adding #undef CONFIG_LMB in the file,
net/tftp.c
So, I would like to know why this doesn’t work as it was working
before applying this patch ?
Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That should give you debug output when lmb is used.
I did add DEBUG macro to lmb.c but the function having the debug
messages isn't getting called. I suppose it was from fs/fs.c
Right, tftp.c is missing the call to that funcftion. Could you add the call to 'lmb_dump_all(&lmb);' right below 'lmb_init_and_reserve()' in tftp.c?
That should give you the output required. And while at it, tell us what 'load_addr' is set to (by adding a printf in tftp.c, too).
Thanks, Simon
Thanks for your patience and time.
Please find the log below,
DHCP client bound to address 172.17.0.2 (1285 ms)
Using usb_ether device
TFTP from server 172.17.0.1; our IP address is 172.17.0.2
Filename 'u-boot.img'.
lmb_dump_all:
memory.cnt = 0x0 memory.size = 0xx reserved.cnt = 0x0 reserved.size = 0xxload_addr: 0x82000000
TFTP error: trying to overwrite reserved memory...
Problem booting with BOOTP
In my u-boot it shows the DRAM size properly as 256MiB
So, do I need to configure my RAM size in SPL stage as well, such that
SPL is aware of the memory size ?
Ehrm, are you doing this from SPL?
Yes, SPL loads u-boot onto the DRAM from Network, when the NAND is empty.
By flashing the same MLO and u-boot binaries onto the NAND, and then doing *dhcp MLO *from u-boot prompt gives the following log,
Using usb_ether device TFTP from server 172.17.0.1; our IP address is 172.17.0.2 Filename 'MLO'. *lmb_dump_all:*
*memory.cnt = 0x1memory.size = 0x0memory.reg[0x0].base = 0x80000000.size = 0x10000000reserved.cnt = 0x1reserved.size = 0x0reserved.reg[0x0].base = 0x8df2ab98.size = 0x20d5468* load_addr: 0x80200000
You need the RAM size for 'lmb_init_and_reserve()' to read, yes. Otherwise it can't know where to safely allocate things.
Regards, Simon
Would you think, SPL should also do the same or is this valid only for u-boot ?
Because, during SPL stage, the RAM would be mostly free anyway, so would you think, we can just use this lmb check only for u-boot but not for SPL ?
Regards, Moses Christopher
FYI, I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the
environment is not stored separately, neither the device tree.
The lmb code works by getting the RAM size, adding reserved areas and
then only
allowing allocations in non-reserved areay. However, the RAM size is not fully used depending on some config options and/or environment variables.
There's possibly
something wrong in your configuration around that.
Because, earlier to this patch, net/tftp.c isn't actually checking
for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it.
Could you kindly provide me some information, where I can read more
about the reserved memory regions and how exactly some region is treated as reserved region ?
Also, it'd be great if you could provide some information related to
the configuration of Reserved and free addresses of RAM.
Thank you for your patience and time.
Regards, Simon
Best regards, Moses Christopher
Best regards, Moses Christopher
On 11.09.19 20:59, Moses Christopher wrote:
On Wed, 11 Sep, 2019, 4:43 PM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com mailto:simon.k.r.goldschmidt@gmail.com> wrote:
On Wed, Sep 11, 2019 at 11:44 AM Moses Christopher <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: > > > > On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>> wrote: >> >> On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher >> <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: >> > >> > Hi Simon, >> > >> > >> > Thanks for the prompt reply. >> > >> > On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>> wrote: >> > >> > Hi, >> > >> > On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher >> > <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: >> > > Hello together, >> > > >> > > I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet. >> > > I found an issue with one of the commit made in the early 2019, >> > > http://patchwork.ozlabs.org/patch/1024795/ >> > > >> > > When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. >> > > And it triggers the following error, >> > > TFTP error: trying to overwrite reserved memory... >> > > I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c >> > > So, I would like to know why this doesn’t work as it was working before applying this patch ? >> > >> > Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That >> > should give you debug >> > output when lmb is used. >> > >> > >> > I did add DEBUG macro to lmb.c but the function having the debug messages isn't getting called. I suppose it was from fs/fs.c >> >> Right, tftp.c is missing the call to that funcftion. Could you add the >> call to 'lmb_dump_all(&lmb);' >> right below 'lmb_init_and_reserve()' in tftp.c? >> >> That should give you the output required. And while at it, tell us >> what 'load_addr' is set to >> (by adding a printf in tftp.c, too). >> >> Thanks, >> Simon > > > Thanks for your patience and time. > > Please find the log below, > > > > DHCP client bound to address 172.17.0.2 (1285 ms) > > Using usb_ether device > > TFTP from server 172.17.0.1; our IP address is 172.17.0.2 > > Filename 'u-boot.img'. > > lmb_dump_all: > > memory.cnt = 0x0 > > memory.size = 0xx > > > > reserved.cnt = 0x0 > > reserved.size = 0xx > > load_addr: 0x82000000 > > > > TFTP error: trying to overwrite reserved memory... > > Problem booting with BOOTP > > > > In my u-boot it shows the DRAM size properly as 256MiB > > So, do I need to configure my RAM size in SPL stage as well, such that SPL is aware of the memory size ? Ehrm, are you doing this from SPL?Yes, SPL loads u-boot onto the DRAM from Network, when the NAND is empty.
By flashing the same MLO and u-boot binaries onto the NAND, and then doing *dhcp MLO *from u-boot prompt gives the following log,
Using usb_ether device TFTP from server 172.17.0.1; our IP address is 172.17.0.2 Filename 'MLO'. *lmb_dump_all:** memory.cnt = 0x1 memory.size = 0x0 memory.reg[0x0].base = 0x80000000 .size = 0x10000000
reserved.cnt = 0x1 reserved.size = 0x0 reserved.reg[0x0].base = 0x8df2ab98 .size = 0x20d5468* load_addr: 0x80200000
OK, so that works for a start ;-)
You need the RAM size for 'lmb_init_and_reserve()' to read, yes. Otherwise it can't know where to safely allocate things. Regards, SimonWould you think, SPL should also do the same or is this valid only for u-boot ?
Yes, SPL should do the same.
Because, during SPL stage, the RAM would be mostly free anyway, so would you think, we can just use this lmb check only for u-boot but not for SPL ?
No. SPL still needs this check. On some platforms, SPL runs with BSS, stack or heap in RAM when executing this, so this is still an attack vector that should be prevented.
Even if SPL does not use DRAM (only SRAM), we still have to check that we only write into valid DRAM addresses. E.g. a file larger than the DRAM would write to whatever comes next in the address range...
Which platform are you running this on, does SPL use a devicetree? In any case, you need your SPL to provide the valid RAM range.
Regards, Simon
Regards, Moses Christopher
> > >> >> > >> > FYI, >> > I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the environment is not stored separately, neither the device tree. >> > >> > >> > The lmb code works by getting the RAM size, adding reserved areas and then only >> > allowing allocations in non-reserved areay. However, the RAM size is >> > not fully used >> > depending on some config options and/or environment variables. There's possibly >> > something wrong in your configuration around that. >> > >> > >> > Because, earlier to this patch, net/tftp.c isn't actually checking for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it. >> > >> > Could you kindly provide me some information, where I can read more about the reserved memory regions and how exactly some region is treated as reserved region ? >> > >> > Also, it'd be great if you could provide some information related to the configuration of Reserved and free addresses of RAM. >> > >> > Thank you for your patience and time. >> > >> > Regards, >> > Simon >> > >> > > >> > > Best regards, >> > > Moses Christopher >> > >> > Best regards, >> > Moses Christopher
On Wed, 11 Sep, 2019, 9:12 PM Simon Goldschmidt, < simon.k.r.goldschmidt@gmail.com> wrote:
On 11.09.19 20:59, Moses Christopher wrote:
On Wed, 11 Sep, 2019, 4:43 PM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com mailto:simon.k.r.goldschmidt@gmail.com> wrote:
On Wed, Sep 11, 2019 at 11:44 AM Moses Christopher <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: > > > > On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>> wrote: >> >> On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher >> <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: >> > >> > Hi Simon, >> > >> > >> > Thanks for the prompt reply. >> > >> > On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>> wrote: >> > >> > Hi, >> > >> > On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher >> > <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>> wrote: >> > > Hello together, >> > > >> > > I was trying to build u-boot and spl for the arm target and tried to boot via usb-ethernet. >> > > I found an issue with one of the commit made in the early2019,
>> > > http://patchwork.ozlabs.org/patch/1024795/ >> > > >> > > When using this CONFIG_LMB the max_size or the lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. >> > > And it triggers the following error, >> > > TFTP error: trying to overwrite reserved memory... >> > > I did a quick fix by adding #undef CONFIG_LMB in the file, net/tftp.c >> > > So, I would like to know why this doesn’t work as it was working before applying this patch ? >> > >> > Can you add "#define DEBUG" as the first line in 'lib/lmb.c'?That
>> > should give you debug >> > output when lmb is used. >> > >> > >> > I did add DEBUG macro to lmb.c but the function having the debug messages isn't getting called. I suppose it was from fs/fs.c >> >> Right, tftp.c is missing the call to that funcftion. Could you add the >> call to 'lmb_dump_all(&lmb);' >> right below 'lmb_init_and_reserve()' in tftp.c? >> >> That should give you the output required. And while at it, tellus
>> what 'load_addr' is set to >> (by adding a printf in tftp.c, too). >> >> Thanks, >> Simon > > > Thanks for your patience and time. > > Please find the log below, > > > > DHCP client bound to address 172.17.0.2 (1285 ms) > > Using usb_ether device > > TFTP from server 172.17.0.1; our IP address is 172.17.0.2 > > Filename 'u-boot.img'. > > lmb_dump_all: > > memory.cnt = 0x0 > > memory.size = 0xx > > > > reserved.cnt = 0x0 > > reserved.size = 0xx > > load_addr: 0x82000000 > > > > TFTP error: trying to overwrite reserved memory... > > Problem booting with BOOTP > > > > In my u-boot it shows the DRAM size properly as 256MiB > > So, do I need to configure my RAM size in SPL stage as well, such that SPL is aware of the memory size ? Ehrm, are you doing this from SPL?Yes, SPL loads u-boot onto the DRAM from Network, when the NAND is empty.
By flashing the same MLO and u-boot binaries onto the NAND, and then doing *dhcp MLO *from u-boot prompt gives the following log,
Using usb_ether device TFTP from server 172.17.0.1; our IP address is 172.17.0.2 Filename 'MLO'. *lmb_dump_all:** memory.cnt = 0x1 memory.size = 0x0 memory.reg[0x0].base = 0x80000000 .size = 0x10000000
reserved.cnt = 0x1 reserved.size = 0x0 reserved.reg[0x0].base = 0x8df2ab98 .size = 0x20d5468* load_addr: 0x80200000
OK, so that works for a start ;-)
You need the RAM size for 'lmb_init_and_reserve()' to read, yes. Otherwise it can't know where to safely allocate things. Regards, SimonWould you think, SPL should also do the same or is this valid only for u-boot ?
Yes, SPL should do the same.
Because, during SPL stage, the RAM would be mostly free anyway, so would you think, we can just use this lmb check only for u-boot but not for
SPL ?
No. SPL still needs this check. On some platforms, SPL runs with BSS, stack or heap in RAM when executing this, so this is still an attack vector that should be prevented.
Even if SPL does not use DRAM (only SRAM), we still have to check that we only write into valid DRAM addresses. E.g. a file larger than the DRAM would write to whatever comes next in the address range...
Ah, that really makes sense. Sorry, if I'm asking too many basic questions.
Which platform are you running this on, does SPL use a devicetree? In
any case, you need your SPL to provide the valid RAM range.
I'm using TI's AM335x based custom board, yes the SPL has the minimal devicetree embedded.
If I understand it correctly, I've to configure my RAM information properly such that the SPL is able to get the RAM size, reserved size, free size, etc..,
Thanks again for you patience and time.
Regards, Moses Christopher
Regards, Simon
Regards, Moses Christopher
> > >> >> > >> > FYI, >> > I'm trying to load SPL and uboot on RAM, using USB-ETH. Also the environment is not stored separately, neither the device tree. >> > >> > >> > The lmb code works by getting the RAM size, adding reserved areas and then only >> > allowing allocations in non-reserved areay. However, the RAM size is >> > not fully used >> > depending on some config options and/or environment variables. There's possibly >> > something wrong in your configuration around that. >> > >> > >> > Because, earlier to this patch, net/tftp.c isn't actually checking for the reserved memory regions and is able to download the files properly on the RAM and it works. I know, that's not a good approach, hence you've made the necessary changes to correct it. >> > >> > Could you kindly provide me some information, where I can read more about the reserved memory regions and how exactly some region is treated as reserved region ? >> > >> > Also, it'd be great if you could provide some information related to the configuration of Reserved and free addresses of RAM. >> > >> > Thank you for your patience and time. >> > >> > Regards, >> > Simon >> > >> > > >> > > Best regards, >> > > Moses Christopher >> > >> > Best regards, >> > Moses Christopher
On 11.09.19 21:33, Moses Christopher wrote:
On Wed, 11 Sep, 2019, 9:12 PM Simon Goldschmidt, <simon.k.r.goldschmidt@gmail.com mailto:simon.k.r.goldschmidt@gmail.com> wrote:
On 11.09.19 20:59, Moses Christopher wrote: > > On Wed, 11 Sep, 2019, 4:43 PM Simon Goldschmidt, > <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com> > <mailto:simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>>> wrote: > > On Wed, Sep 11, 2019 at 11:44 AM Moses Christopher > <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com> <mailto:moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>>> > wrote: > > > > > > > > On Wed, 11 Sep, 2019, 10:32 AM Simon Goldschmidt, > <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com> > <mailto:simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>>> wrote: > >> > >> On Mon, Sep 9, 2019 at 11:29 AM Moses Christopher > >> <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com> > <mailto:moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>>> wrote: > >> > > >> > Hi Simon, > >> > > >> > > >> > Thanks for the prompt reply. > >> > > >> > On Fri, 6 Sep, 2019, 8:13 AM Simon Goldschmidt, > <simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com> > <mailto:simon.k.r.goldschmidt@gmail.com <mailto:simon.k.r.goldschmidt@gmail.com>>> wrote: > >> > > >> > Hi, > >> > > >> > On Thu, Sep 5, 2019 at 4:14 PM Moses Christopher > >> > <moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com> > <mailto:moseschristopherb@gmail.com <mailto:moseschristopherb@gmail.com>>> wrote: > >> > > Hello together, > >> > > > >> > > I was trying to build u-boot and spl for the arm target and > tried to boot via usb-ethernet. > >> > > I found an issue with one of the commit made in the early 2019, > >> > > http://patchwork.ozlabs.org/patch/1024795/ > >> > > > >> > > When using this CONFIG_LMB the max_size or the > lmb_get_free_size(&lmb, load_addr); returns 0, no matter what. > >> > > And it triggers the following error, > >> > > TFTP error: trying to overwrite reserved memory... > >> > > I did a quick fix by adding #undef CONFIG_LMB in the file, > net/tftp.c > >> > > So, I would like to know why this doesn’t work as it was > working before applying this patch ? > >> > > >> > Can you add "#define DEBUG" as the first line in 'lib/lmb.c'? That > >> > should give you debug > >> > output when lmb is used. > >> > > >> > > >> > I did add DEBUG macro to lmb.c but the function having the > debug messages isn't getting called. I suppose it was from fs/fs.c > >> > >> Right, tftp.c is missing the call to that funcftion. Could you > add the > >> call to 'lmb_dump_all(&lmb);' > >> right below 'lmb_init_and_reserve()' in tftp.c? > >> > >> That should give you the output required. And while at it, tell us > >> what 'load_addr' is set to > >> (by adding a printf in tftp.c, too). > >> > >> Thanks, > >> Simon > > > > > > Thanks for your patience and time. > > > > Please find the log below, > > > > > > > > DHCP client bound to address 172.17.0.2 (1285 ms) > > > > Using usb_ether device > > > > TFTP from server 172.17.0.1; our IP address is 172.17.0.2 > > > > Filename 'u-boot.img'. > > > > lmb_dump_all: > > > > memory.cnt = 0x0 > > > > memory.size = 0xx > > > > > > > > reserved.cnt = 0x0 > > > > reserved.size = 0xx > > > > load_addr: 0x82000000 > > > > > > > > TFTP error: trying to overwrite reserved memory... > > > > Problem booting with BOOTP > > > > > > > > In my u-boot it shows the DRAM size properly as 256MiB > > > > So, do I need to configure my RAM size in SPL stage as well, such > that SPL is aware of the memory size ? > > Ehrm, are you doing this from SPL? > > > Yes, SPL loads u-boot onto the DRAM from Network, when the NAND is empty. > > By flashing the same MLO and u-boot binaries onto the NAND, and then > doing *dhcp MLO *from u-boot prompt gives the following log, > > Using usb_ether device > TFTP from server 172.17.0.1; our IP address is 172.17.0.2 > Filename 'MLO'. > *lmb_dump_all:** > memory.cnt = 0x1 > memory.size = 0x0 > memory.reg[0x0].base = 0x80000000 > .size = 0x10000000 > > reserved.cnt = 0x1 > reserved.size = 0x0 > reserved.reg[0x0].base = 0x8df2ab98 > .size = 0x20d5468* > load_addr: 0x80200000 OK, so that works for a start ;-) > > > > You need the RAM size for 'lmb_init_and_reserve()' to read, yes. > Otherwise it can't know > where to safely allocate things. > > Regards, > Simon > > > Would you think, SPL should also do the same or is this valid only for > u-boot ? Yes, SPL should do the same. > > Because, during SPL stage, the RAM would be mostly free anyway, so would > you think, we can just use this lmb check only for u-boot but not for SPL ? No. SPL still needs this check. On some platforms, SPL runs with BSS, stack or heap in RAM when executing this, so this is still an attack vector that should be prevented. Even if SPL does not use DRAM (only SRAM), we still have to check that we only write into valid DRAM addresses. E.g. a file larger than the DRAM would write to whatever comes next in the address range...Ah, that really makes sense. Sorry, if I'm asking too many basic questions.
Which platform are you running this on, does SPL use a devicetree? In any case, you need your SPL to provide the valid RAM range.I'm using TI's AM335x based custom board, yes the SPL has the minimal devicetree embedded.
If I understand it correctly, I've to configure my RAM information properly such that the SPL is able to get the RAM size, reserved size, free size, etc..,
Yes. I would have expected that to come from the devicetree though...
I'd appreciate if you could come back here with a solution what exactly was missing to get it running, if only for the archives that other users find the result.
Regards, Simon
Thanks again for you patience and time.
Regards, Moses Christopher
Regards, Simon > > Regards, > Moses Christopher > > > > > > > >> > >> > > >> > FYI, > >> > I'm trying to load SPL and uboot on RAM, using USB-ETH. Also > the environment is not stored separately, neither the device tree. > >> > > >> > > >> > The lmb code works by getting the RAM size, adding reserved > areas and then only > >> > allowing allocations in non-reserved areay. However, the RAM > size is > >> > not fully used > >> > depending on some config options and/or environment variables. > There's possibly > >> > something wrong in your configuration around that. > >> > > >> > > >> > Because, earlier to this patch, net/tftp.c isn't actually > checking for the reserved memory regions and is able to download the > files properly on the RAM and it works. I know, that's not a good > approach, hence you've made the necessary changes to correct it. > >> > > >> > Could you kindly provide me some information, where I can read > more about the reserved memory regions and how exactly some region > is treated as reserved region ? > >> > > >> > Also, it'd be great if you could provide some information > related to the configuration of Reserved and free addresses of RAM. > >> > > >> > Thank you for your patience and time. > >> > > >> > Regards, > >> > Simon > >> > > >> > > > >> > > Best regards, > >> > > Moses Christopher > >> > > >> > Best regards, > >> > Moses Christopher >
participants (2)
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Moses Christopher -
Simon Goldschmidt