Re: [PATCH] src/ext4_resize.c: set errno to 0 before the strtoull call

[Cristian Rodríguez <crrodriguez@xxxxxxxxxxxx>]

On Wed, Jan 19, 2022 at 10:57 AM Cristian Rodríguez
<crrodriguez@xxxxxxxxxxxx> wrote:

> This is not a glibc problem though, looks like lcap is clobbering
> errno. I'd bet good CLP on the code called in
> __attribute__((constructor (300))) static void _initialize_libcap(void) .
> I strongly suggest not to use constructors on shared libraries unless
> all the components using the library are in your control and you are
> sure constructors will not ruin some other application's day.

__attribute__((constructor (300))) static void _initialize_libcap(void)
{
    if (_cap_max_bits) {
        return;
    }
    cap_set_syscall(NULL, NULL);  --> nope
    _binary_search(_cap_max_bits, cap_get_bound, 0, __CAP_MAXBITS,
__CAP_BITS); --> 🤔
    cap_proc_root("/proc");
}

do, what cap_get_bound does ?

int cap_get_bound(cap_value_t cap)
{
    int result;

    result = prctl(PR_CAPBSET_READ, pr_arg(cap), pr_arg(0));
    if (result < 0) {
        errno = -result; --> If all my bets paid , I would be rich..
here is your 1
        return -1;
    }
    return result;
}