similar to: [LLVMdev] Obfuscation/software watermarking backend

Greetings, I have just set up samba printing with CUPS as the back end. (Samba 2.2.8a, CUPS 1.1.9) Everything works great, including automatic driver download/Point -n- Print. The problem is that whenever I print through Samba from a Windows 2000 Workstation, a watermark gets added to the print job. The default driver options are set on the server, so that watermarking is "off",

I''m working on a photo gallery and I''m using File_column to handle the uploads of the files and create my thumbnails, but does anyone here have any idea how to have a watermark (opaque text maybe) placed over one of the versions? Any ideas on how to go about this would be great. Even if it''s just straight RMagick code, that would be fine too. Thanks in advance for the

Hi… I want to use grImport to create a watermark on a plot() using the methods Paul Murrell describes here: http://cran.r-project.org/web/packages/grImport/vignettes/import.pdf (page 28). I can essentially reproduce this manually at the R prompt, and independently I can use grid.picture(…) successfully in a R script, but when I attempt to do do this in my script: • • •

Hello all, I'm implementing a watermarking feature for lld that computes a hash of loadable segments and places the result in a note section. Ongoing work can be found here: https://reviews.llvm.org/D70316 https://reviews.llvm.org/D66426 The purpose of this watermark is to enable detection of post-link modifications to the loadable segments of the binary. Such modifications may produce a

Matt, The LLVMCore library provides constant folding automatically. So, when your obfuscated module is read in and the assembler re-creates your constants, the arithmetic is done automatically and the constants are folded. To see where this is done, see lib/VMCore/ConstantFold.cpp Reid. On Thu, 2007-12-13 at 02:22 -0600, Matt Fredrikson wrote: > Hello all, > > I am implementing some

On Thu, 13 Dec 2007, Matt Fredrikson wrote: > After I run opt on an un-obfuscated bitcode file to produce an > obfuscated bitcode file, I verify that my transformations were placed ok > in the file using llvm-dis. At this point, the changes appear to have > been made. However, if I run the obfuscated bitcode file through llc > to produce x86 assembly, the obfuscations vanish. I

The other thread brought to my attention that only the <email> syntax obfuscates mailto links. Plus, while the entity encoding technique probably fools some scrapers, I doubt it's all that effective. Even Gruber uses the Hivelogic Enkoder [1]. So, what are people using for obfuscation and are you using any scripting or automation (filter that takes a pass before or after Markdown) to

Hello, Matt. > Does anybody know what pass is clobbering my obfuscations? I think this is DAG combiner machinery in the codegenerator itself. Try to provide -fast option to llc. -- With best regards, Anton Korobeynikov. Faculty of Mathematics & Mechanics, Saint Petersburg State University.

Hello all, I am implementing some simple obfuscation transformations in LLVM. One of the obfuscations involves searching for particular constants, and "unrolling" them throughout a procedure using arithmetic. In effect, certain constants are broken up into smaller constants and recombined as needed using the appropriate operators. I perform this on intermediate LLVM instructions. After

Hi there, I''d like to use RMagick to watermark an image in the tmp directory before Attachment_fu saves it to Amazon S3. I took a look at the callbacks available in attachment_fu. There''s an ''after_attachment_saved'' method but this would be too late, and a ''before_thumbnail_saved'' but this is no good because it''s for thumbnails. I

Dirk Eddelbuettel and Albrecht Gephardt have created many Debian packages of R packages from CRAN and other archives. I wanted to install all these Debian packages on a machine running the Debian testing distribution. One way to do this is to search (using the apt-cache program) for all Debian package names that begin with 'r-', extract the package name, and concatenate all those names

Hi Sanjay, > Am 02.08.2016 um 21:39 schrieb Sanjay Patel <spatel at rotateright.com>: > > Hi Matthias - > > Sorry for the delayed reply. I think you're on the right path with D22864. No problem, thank you for your answer! > If I'm understanding it correctly, my foo() example and zext_or_icmp_icmp() will be equivalent after your patch is added to InstCombine.

The ELF file header isn't always covered by a segment but still affects loading. I think everything else that effects loading/dynamic linking is always covered by a PT_LOAD segment. As evidence this is basically what --strip-sections in llvm-strip and eu-strip do and they produce perfectly runnable binaries. Having a hash of the actual memory map is interesting IMO. Build IDs can't really

Hi all, I have a question regarding a transformation that is carried out in InstCombine, which has been introduced by r48715. It unfolds expressions of the form `zext(or(icmp, (icmp)))` to `or(zext(icmp), zext(icmp)))` to expose pairs of `zext(icmp)`. In a subsequent iteration these `zext(icmp)` pairs could then (possibly) be optimized by another optimization (which has already been there before

Hi all, I was trying to implement an obfuscation tool for C-code on the basis of LLVM. I got a prototype of the simple obfuscation transformation which converting control flow graph to something like a state machine. I am not sure I will have time to work on extending further this tool with new transformations like opaque predicates and decided to put here source code I have by now with hope

Hi Sanjay, thank you a lot for your answer. I understand that in your examples it is desirable that `foo` and `goo` are canonicalized to the same IR, i.e., something like `@goo`. However, I still have a few open questions, but please correct me in case I'm thinking in the wrong direction. > Am 21.07.2016 um 18:51 schrieb Sanjay Patel <spatel at rotateright.com>: > > I've

Hello, I am looking for a loop unfolding procedure implemented in LLVM that helps to transform a while-loop to n-layer If-statements. The transformation should be on IR, although the example below is illustrated on the source level. original loop: * WHILE (condition) DO action ENDWHILE* Expected unfolded loop (2-layer): * IF (condition) THEN* * action* * IF

I'm trying to put together an R routine to conduct unidimensional unfolding scaling analysis using maximum likelihood. My problem is that ML optimization will get stuck at latent scale points that are far from optimal. The point optimizes on one of the observed variables but not others and for ML to move away from this 'local optimum', it has to move in a direction in which the

On Mon, Jan 5, 2009 at 2:32 PM, Alex <alex.lavoro.propio at gmail.com> wrote: > In .td file, if the pattern to match the DAG is: > > (vector_shuffle (mul build_vector, build_vector)) > > is it possible to return 'mul' (SDNode*) instead of returning the first > 'vector_shuffle'? > > It seems to me that the default instruction selector can only return

In .td file, if the pattern to match the DAG is: (vector_shuffle (mul build_vector, build_vector)) is it possible to return 'mul' (SDNode*) instead of returning the first 'vector_shuffle'? It seems to me that the default instruction selector can only return the 'root' node of the pattern. Alex. -------------- next part -------------- An HTML attachment was scrubbed...