Arch Linux

davemilter

Member

Registered: 2017-08-18

Posts: 4

-fsanitize problem on arch linux?

I tried simple program:

int main() {
        int arr[5];
        arr[5] = 17;
        return 0;
}

gcc -fsanitize=address -Og -ggdb a.c
LD_PRELOAD=/usr/lib/libasan.so ./a.out

My setup is default as possible: amd64/default arch kernel from pacman/default gcc-multilib/default gcc-libs-multilib,
last on the current moment,

but as result I got:

> Shadow memory range interleaves with an existing memory mapping. ASan cannot proceed correctly. ABORTING

Interesting that problem has not 100% probability:

$ for i in `seq 1 100`; do LD_PRELOAD=/usr/lib/libasan.so ./a.out 2>&1 ; sleep 1; done > /tmp/log
$ grep 'Shadow memory range interleaves' /tmp/log  | wc -l
86

As you see 14 times I got it to work.

So may be default arch linux has something like memory randomization?
How can I switch it off?

Note that I use default linux, not linux-hardened.

foutrelis

Developer

From: Athens, Greece

Registered: 2008-07-28

Posts: 705

Website

Re: -fsanitize problem on arch linux?

The issue is this: https://bugs.archlinux.org/task/55008

It will get fixed in the near-ish future.