[U-Boot] [RESEND PATCH] core: ofnode: Add ofnode_get_addr_size_index

[Simon Glass]

Hi Keethy,

On Tue, 9 Jul 2019 at 13:38, Eugeniu Rosca <roscaeugeniu at gmail.com> wrote:
>
> Hi All,
>
> On Wed, Apr 24, 2019 at 05:19:53PM +0530, Keerthy wrote:
> > Add ofnode_get_addr_size_index function to fetch the address
> > and size of the reg space based on index.
> >
> > Signed-off-by: Keerthy <j-keerthy at ti.com>
> > Reviewed-by: Simon Glass <sjg at chromium.org>
> > ---
> >
> > Previous  discussion can be found here:
> >
> >   * https://patchwork.ozlabs.org/patch/999659/
> >
> >  drivers/core/ofnode.c | 13 ++++++++++---
> >  include/dm/ofnode.h   | 14 ++++++++++++++
> >  2 files changed, 24 insertions(+), 3 deletions(-)
>
> jFYI/FWIW, this patch, present in U-Boot/master as commit [1], revives
> the issue fixed in [2]. More precisely, when compiling the sandbox
> U-Boot with -fsanitize=address and linking it against -lasan,
> the following backtrace pops up during boot [3].
>
> [1] https://gitlab.denx.de/u-boot/u-boot/commit/e679d03b08fb
>     ("core: ofnode: Add ofnode_get_addr_size_index")
> [2] https://gitlab.denx.de/u-boot/u-boot/commit/9bfacf249b10
>     ("core: ofnode: Fix ASAN-reported stack-buffer-overflow in of_get_address")
> [3] The same issue as fixed in [2], now reproduced on v2019.07
>
> ==5996==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffc65f869a0 at pc 0x564834c6cd89 bp 0x7ffc65f867b0 sp 0x7ffc65f867a0
> WRITE of size 8 at 0x7ffc65f869a0 thread T0
>     #0 0x564834c6cd88 in of_get_address drivers/core/of_addr.c:154
>     #1 0x564834c74fac in ofnode_get_addr_size_index drivers/core/ofnode.c:262
>     #2 0x564834c75232 in ofnode_get_addr_index drivers/core/ofnode.c:290
>     #3 0x564834d35a4f in sb_eth_ofdata_to_platdata drivers/net/sandbox.c:422
>     #4 0x564834c5ad22 in device_probe drivers/core/device.c:407
>     #5 0x564834f2f1c4 in eth_initialize net/eth-uclass.c:399
>     #6 0x564834bf9c34 in initr_net common/board_r.c:565
>     #7 0x564834bfa580 in initcall_run_list include/initcall.h:38
>     #8 0x564834bfa580 in board_init_r common/board_r.c:867
>     #9 0x564834b8156d in main arch/sandbox/cpu/start.c:362
>     #10 0x7f2fe7912b6a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x26b6a)
>     #11 0x564834b85b29 in _start (/srv/R/u-boot-master/u-boot+0x792b29)
>
> Address 0x7ffc65f869a0 is located in stack of thread T0 at offset 32 in frame
>     #0 0x564834c751c4 in ofnode_get_addr_index drivers/core/ofnode.c:287
>
>   This frame has 1 object(s):
>     [32, 36) 'size' (line 288) <== Memory access at offset 32 partially overflows this variable
> HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
>       (longjmp and C++ exceptions *are* supported)
> SUMMARY: AddressSanitizer: stack-buffer-overflow drivers/core/of_addr.c:154 in of_get_address
> Shadow bytes around the buggy address:
>   0x10000cbe8ce0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x10000cbe8cf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x10000cbe8d00: 00 00 f1 f1 f1 f1 04 f2 04 f2 04 f3 f3 f3 00 00
>   0x10000cbe8d10: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1
>   0x10000cbe8d20: 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
> =>0x10000cbe8d30: f1 f1 f1 f1[04]f3 f3 f3 00 00 00 00 00 00 00 00
>   0x10000cbe8d40: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
>   0x10000cbe8d50: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x10000cbe8d60: f1 f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00
>   0x10000cbe8d70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x10000cbe8d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> Shadow byte legend (one shadow byte represents 8 application bytes):
>   Addressable:           00
>   Partially addressable: 01 02 03 04 05 06 07
>   Heap left redzone:       fa
>   Freed heap region:       fd
>   Stack left redzone:      f1
>   Stack mid redzone:       f2
>   Stack right redzone:     f3
>   Stack after return:      f5
>   Stack use after scope:   f8
>   Global redzone:          f9
>   Global init order:       f6
>   Poisoned by user:        f7
>   Container overflow:      fc
>   Array cookie:            ac
>   Intra object redzone:    bb
>   ASan internal:           fe
>   Left alloca redzone:     ca
>   Right alloca redzone:    cb
>   Shadow gap:              cc
> ==5996==ABORTING
>

Can you please take a look?

Regards,
Simon