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From: Tom H. <to...@co...> - 2011-01-03 20:33:44
|
On 03/01/11 20:23, Konstantin Serebryany wrote: > We are seeing more and more of this error: > valgrind: mmap(0x38000000, 2375680) failed in UME with error 22 (Invalid > argument). > valgrind: this can be caused by executables with very large text, data > or bss segments. > > (known as > http://bugs.kde.org/show_bug.cgi?id=138424, > http://bugs.kde.org/show_bug.cgi?id=184981, > http://code.google.com/p/chromium/issues/detail?id=28439). > > Any chance to fix it? Do you have a reliable reproducer? (If no, we > could send a pre-built binary for Ubuntu 10.04)... What makes you think it can be fixed? It's a basic limitation of valgrind that it needs to reserve some memory for itself and hence there will be less available for the client program than when it is not running valgrind. That is, I believe, the basic cause of this error, that after valgrind has reserved memory for itself there is not enough room to load the executable. Tom -- Tom Hughes (to...@co...) http://compton.nu/ |
|
From: Konstantin S. <kon...@gm...> - 2011-01-03 20:23:59
|
Hi, We are seeing more and more of this error: valgrind: mmap(0x38000000, 2375680) failed in UME with error 22 (Invalid argument). valgrind: this can be caused by executables with very large text, data or bss segments. (known as http://bugs.kde.org/show_bug.cgi?id=138424, http://bugs.kde.org/show_bug.cgi?id=184981, http://code.google.com/p/chromium/issues/detail?id=28439). Any chance to fix it? Do you have a reliable reproducer? (If no, we could send a pre-built binary for Ubuntu 10.04)... Thanks, and happy new year! --kcc |
|
From: Julian S. <js...@ac...> - 2011-01-03 13:51:30
|
Interesting use case! > * Syscall whitelisting is done within valgrind, notably preventing the > client from escaping valgrind through execve(), and from closing or > duping over the FD used for valgrind messages > > * Client requests are banned (immediate exit when seeing them in the IR) > > * Memory is tracked far enough to be sure that the client cannot write > to valgrind's memory > > As soon as you can stop screaming "valgrind -- security -- CRAZY", I > would of course be interested to hear if there are any other known > holes. I still plan on keeping the "other" syscall whitelist, to have > double security against leaking the testcases through socket() etc, > but any issue with valgrind would at least allow the student to > circumvent the time limits, which is bad enough. I'm not sure if it could be used to circumvent time limits, but .. you might want to stop the client looking at /proc/self/* or even within /proc. Using (eg) /proc/self/maps it is easy to figure out that you're not running on the real hardware. We already have to fake /proc/self/cmdline (iirc) in order to make OpenOffice work at all. J |
|
From: Irfan Ul H. <irf...@se...> - 2011-01-03 09:53:32
|
Dear all, We are currently in the process of porting Valgrind for MIPS/Linux Platform. Everything else works, except that multithreaded applications using nptl threading library reach the futex deadlock. Google helped us find reference to the bug listed on link: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=299514 We are facing exactly same problem. Note that when we run Valgrind under gdb and add a breakpoint just before child thread's exit and then continue, our program exits normally, producing the expected output. However, the program running directly under Valgrind does not produce expected output. Any idea how to fix this part? -- Irfan |