Package: libc6
Version: 2.39-6
Severity: normal
The following program
#include <mcheck.h>
#include <stdio.h>
int main (void)
{
int r;
r = mcheck (NULL);
printf ("%d\n", r);
return 0;
}
outputs -1, which is incorrect. It should have been 0.
The glibc manual says
It is too late to begin allocation checking once you have allocated
anything with ‘malloc’. So ‘mcheck’ does nothing in that case.
The function returns ‘-1’ if you call it too late, and ‘0’
otherwise (when it is successful).
Since there hasn't been any malloc yet, 0 should have been output.
Similarly, the example given in the mcheck(3) man page fails
unexpectedly.
-- System Information:
Debian Release: trixie/sid
APT prefers unstable-debug
APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500,
'stable-security'), (500, 'stable-debug'), (500, 'proposed-updates-debug'),
(500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 6.7.12-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages libc6 depends on:
ii libgcc-s1 14.2.0-1
Versions of packages libc6 recommends:
ii libidn2-0 2.3.7-2
Versions of packages libc6 suggests:
ii debconf [debconf-2.0] 1.5.87
ii glibc-doc 2.39-6
ii libc-l10n 2.39-6
pn libnss-nis <none>
pn libnss-nisplus <none>
ii locales 2.39-6
-- debconf information:
glibc/restart-failed:
* libraries/restart-without-asking: true
glibc/disable-screensaver:
glibc/upgrade: true
glibc/restart-services:
glibc/kernel-not-supported:
glibc/kernel-too-old:
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
