fedora-users October 2011 archive
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fedora-users: Re: bash: ./a.out: Permission denied

Re: bash: ./a.out: Permission denied

From: Bryn M. Reeves <bmr_at_nospam>
Date: Wed Oct 19 2011 - 17:20:06 GMT
To: Community support for Fedora users <users@lists.fedoraproject.org>

On 10/19/2011 06:08 PM, Joe Zeff wrote:
> On 10/19/2011 09:50 AM, shailesh wrote:
>> when i try to run compiled c program ("./a.out") get error
>> bash: ./a.out: Permission denied
> Files aren't automatically executable under Linux.
> chmod u+x a.out
> ./a.out
> will get you what you want.

gcc (well, strictly speaking it's ld but called by gcc) normally gives
executable output files exec permissions when compiling regardless of umask:

$ umask 0002; echo -ne '#include <stdio.h>\nint main(int argc, char
**argv)\n{\n\tprintf("%s\\n", "Hello World!");\n}' > x.c; strace -f gcc
x.c 2>&1 | grep chmod
[pid 11229] chmod("a.out", 0775) = 0

Getting EACCESS on a freshly compiled binary often implies that the file
system doesn't allow executable permissions - either it's mounted with
noexec, SELinux is preventing the exec or the file system does not
support executable permissions.

Are you using removable/network storage? What's does mount say?

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