Radare2: Failed to write instruction (ELF 32bit ARM shared library)

[MaxXor]

Work environment

| Questions | Answers
|------------------------------------------------------|--------------------
| OS/arch/bits (mandatory) | Arch Linux x86_64
| File format of the file you reverse (mandatory) | ELF 32-bit LSB shared object ARM, EABI5 version 1 (SYSV), dynamically linked
| Architecture/bits of the file (mandatory) | ARM 32bit
| r2 -v full output, not truncated (mandatory) | radare2 2.6.0 0 @ linux-x86-64 git.2.6.0 commit: HEAD build: 2018-05-23__01:38:10

Expected behavior

Successful write

Actual behavior

Failed to write

Steps to reproduce the behavior

• Open ELF 32bit ARM shared library
• Try to change an instruction with wa mov r0, 1
• I can provide the library if needed in private

[radare]

Did you opened qith -w? Did you tried with rasm2?

On 24 May 2018, at 23:34, MaxXor [e-mail] wrote:

Work environment

Questions Answers
OS/arch/bits (mandatory) Arch Linux x86_64
File format of the file you reverse (mandatory) ELF 32-bit LSB shared object ARM, EABI5 version 1 (SYSV), dynamically linked
Architecture/bits of the file (mandatory) ARM 32bit
r2 -v full output, not truncated (mandatory) radare2 2.6.0 0 @ linux-x86-64 git.2.6.0 commit: HEAD build: 2018-05-23__01:38:10
Expected behavior

Successful write

Actual behavior

Failed to write

Steps to reproduce the behavior

Open ELF 32bit ARM shared library
Try to change an instruction with wa mov r0, 1
I can provide the library if needed in private
—
You are receiving this because you are subscribed to this thread.
Reply to this email directly, view it on GitHub, or mute the thread.

[MaxXor]

It's also not working when I start radare2 with r2 -A -w <file>... I'm sure it worked before with ARM 32bit files as I've did it before. Never used rasm2.

[MaxXor]

I've tested patching files of other architectures and it seems to be working. Only ARM seems to be affected.

[MaxXor]

I've digged a little bit into this issue and I found out that the writing of ARM instructions is working in radare version 2.3.0.

[sivaramaaa]

@MaxXor , @radare i think i found the issue here !

With Analysis (not working)

$ r2 -A -w arm-bin
[x] Analyze all flags starting with sym. and entry0 (aa)
...
[x] Constructing a function name for fcn.* and sym.func.* functions (aan)
[0x00014348]> wa mov r0, 1
Failed to write

Without analysis (Works fine)

$ r2  -w arm-bin
[0x00014348]> wa mov r0, 1
Written 4 byte(s) (mov r0, 1) = wx 0100a0e3

[0x00014348]> pd 1
0x00014348      0100a0e3       mov r0, 1

[radare]

cant repro on mach0-x86-64

[radare]

in fact i cant repro on elf-arm binary either, can you share this bin? or try again?

[MaxXor]

I've tested again with latest commit https://github.com/radare/radare2/commit/e3d11b989c869f8f0c9ba89b1e2292dc0a6491b8 and now when I run r2 -A -w arm-bin I get a segmentation fault. Will send you the binary later via mail.

@radare Did you try with -A as @sivaramaaa showed?

[radare]

wtf? which version of r2 do you have? do u have more than one r2 installed? see r2 -V

On 11 Jun 2018, at 11:07, MaxXor [e-mail] wrote:

I've tested again with latest commit e3d11b9 https://github.com/radare/radare2/commit/e3d11b989c869f8f0c9ba89b1e2292dc0a6491b8 and now when I run r2 -A -w arm-bin I get a segmentation fault. Will send you the binary later via mail.

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub https://github.com/radare/radare2/issues/10182#issuecomment-396174824, or mute the thread https://github.com/notifications/unsubscribe-auth/AA3-lkryelJRhrbPS4AzvZoZFrYEUXrHks5t7jNpgaJpZM4UNCJ6.

[MaxXor]

I tested with radare2 2.6.0 release build as you can read in the first post of this issue and now tried again by compiling it from the latest commit where I get the segmentation fault at the end of the analysis.

[radare]

test against git, we dont fix bugs in releases

On 11 Jun 2018, at 12:04, MaxXor [e-mail] wrote:

I tested with radare2 2.6.0 release build as you can read in the first post of this issue and now tried again by compiling it from the latest commit where I get the segmentation fault at the end of the analysis.

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub https://github.com/radare/radare2/issues/10182#issuecomment-396191105, or mute the thread https://github.com/notifications/unsubscribe-auth/AA3-li6qEo6hlz-vSjJsUOOLmzM7JVplks5t7kCvgaJpZM4UNCJ6.

[radare]

can you share the binary?

On 11 Jun 2018, at 12:04, MaxXor [e-mail] wrote:

I tested with radare2 2.6.0 release build as you can read in the first post of this issue and now tried again by compiling it from the latest commit where I get the segmentation fault at the end of the analysis.

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub https://github.com/radare/radare2/issues/10182#issuecomment-396191105, or mute the thread https://github.com/notifications/unsubscribe-auth/AA3-li6qEo6hlz-vSjJsUOOLmzM7JVplks5t7kCvgaJpZM4UNCJ6.

[MaxXor]

Sent you the library on the mail mentioned on your github profile. Try it with r2 -A -w <file>.

[radare]

works perfectly fine, the problem is in your installation, run make purge to remove all installations or messy files from old r2 setups and then sys/install.sh

[MaxXor]

You are right, just tested the latest commit in a clean environment & it's working again.