Hi guys,
I tried out coreutils-4.5.7 and noticed a problem with the "C stack
overflow detection" check performed by the configure script.
It seems to loop infinitely until it gets killed by the kernel. The test
runs for a few minute in which is consumed 512 MB RAM and 128 MB swap. It
then gets killed by the kernel and that's the end of that. I doubt it is
intended like this?
I have no fix for this as of yet. For your convenience I have attached a
file stackoverflow.c which is a straight copy & paste from the configure
script. Compiling and running the program outside of the configure
environment has the exact same symptoms.
Please let me know if I can assist with debugging in case it's not
reproducible.
Relevant system information:
GCC-3.2.1
Glibc-2.3.1
Binutils-2.13.1
PS: any target release date for a first public release?
--
Gerard Beekmans
www.linuxfromscratch.org
-*- If Linux doesn't have the solution, you have the wrong problem -*-
#include <unistd.h>
#include <signal.h>
#include <ucontext.h>
static union
{
char buffer[SIGSTKSZ];
long double ld;
long u;
void *p;
} alternate_signal_stack;
#if STACK_DIRECTION
# define find_stack_direction(ptr) STACK_DIRECTION
#else
static int
find_stack_direction (char const *addr)
{
char dummy;
return (! addr ? find_stack_direction (&dummy)
: addr < &dummy ? 1 : -1);
}
#endif
static void
segv_handler (int signo, siginfo_t *info, void *context)
{
if (0 < info->si_code)
{
ucontext_t const *user_context = context;
char const *stack_min = user_context->uc_stack.ss_sp;
size_t stack_size = user_context->uc_stack.ss_size;
char const *faulting_address = info->si_addr;
size_t s = faulting_address - stack_min;
size_t page_size = sysconf (_SC_PAGESIZE);
if (find_stack_direction (0) < 0)
s += page_size;
if (s < stack_size + page_size)
_exit (0);
}
_exit (1);
}
static int
c_stack_action (void)
{
stack_t st;
struct sigaction act;
int r;
st.ss_flags = 0;
st.ss_sp = alternate_signal_stack.buffer;
st.ss_size = sizeof alternate_signal_stack.buffer;
r = sigaltstack (&st, 0);
if (r != 0)
return r;
sigemptyset (&act.sa_mask);
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
act.sa_sigaction = segv_handler;
return sigaction (SIGSEGV, &act, 0);
}
static int
recurse (char *p)
{
char array[500];
array[0] = 1;
return *p + recurse (array);
}
int main (void)
{
c_stack_action ();
return recurse ("\1");
}
_______________________________________________
Bug-coreutils mailing list
[EMAIL PROTECTED]
http://mail.gnu.org/mailman/listinfo/bug-coreutils
