Re: mprotect broken on ppc

On Sun, Jan 21, Olaf Hering wrote:

On Sat, Jan 20, Olaf Hering wrote:

quoted

On Sat, Jan 20, Olaf Hering wrote:

quoted

Hi,

there seems to be a bug in mprotect which was introduced in
test9->test10.

The result is an invalid pointer from the getpwuid(3) function, this
function is used in rpm to check owner and group permissions.

forgot some facts:

the build host runs always a glibc2.13 system with 2.2 headers. The
build chroot runs a glibc2.2 system with 2.4.0ac2 headers.
And it fails when a kernel 2.4.0-test10 or later is running, every other
kernel works fine.

I put some debug in mm/mprotect.c:
...
asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned
long prot)
{
        unsigned long nstart, end, tmp;
        struct vm_area_struct * vma, * next;
        int error = -EINVAL;

        if (start & ~PAGE_MASK) {
                printk("sys_mprotect start \n");
                return -EINVAL;
        }
...

it fails here.
Jan 21 18:28:06 mandarine kernel: sys_mprotect start

sys_mprotect start= 6ffdffb0,PAGE_MASK= fffff000


It was solved with this patch:
http://penguinppc.org/~olaf/broken_build/elf.diff


Gruss Olaf

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