It is noted on the discussion "Sage 4.3.3 Fails To Build On 64 bit Linux
System (gcc.4.4.2)" on sage-support that Sage fails to build on SELinux unless
the stack protection is disabled. I asked on comp.lang.c for help in writing a
program which would detect if stack protection is enabled or not. Someone gave
me this, which apparently works on x86.
typedef void(*voidfn)(void);
int main(void)
{
char a[2] = {0xc3,0};
voidfn fnptr = (voidfn)a;
fnptr();
}
Trying that on my OpenSolaris (x86) system, it does not crash, until I enable
stack protection with:
set noexec_user_stack=1
set noexec_user_stack_log=1
in /etc/system. After doing that, the program dumps core as expected.
When I try the same program on sage.math, it dumps core there too. So I don't
know if sage.math has protection of the stack enabled. If it does, then it is
strange that SELinux has problems, whereas sage.math does not.
dave
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