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Bug#599574: linux-image-2.6.32-5-amd64: with seccomp, _exit(0) kills process

Subject: linux-image-2.6.32-5-amd64: with seccomp, _exit(0) kills process
Package: linux-2.6
Version: 2.6.32-23
Severity: normal

*** Please type your report below this line ***

Processes with seccomp are killed at _exit. They should be permitted to
call _exit, read, and write (read and write do work).

To reproduce:

cat > main.c << EOF
#include <unistd.h>
#include <sys/prctl.h>
int main() { prctl(PR_SET_SECCOMP, 1, 0, 0, 0); _exit(0); }
gcc -Wall -Wextra main.c -o seccomptest

If the loaded modules, PCI devices, and USB devices sections would help,
please say so, and I will include them. They seem irrelevant to this

-- Package-specific info:
** Version:
Linux version 2.6.32-5-amd64 (Debian 2.6.32-23) (dannf@debian.org) (gcc version 4.3.5 (Debian 4.3.5-3) ) #1 SMP Fri Sep 17 21:50:19 UTC 2010

** Command line:
BOOT_IMAGE=/vmlinuz-2.6.32-5-amd64 root=/dev/mapper/hda4_crypt ro vga=794

** Not tainted

** Model information
sys_vendor: System manufacturer
product_name: System Product Name
product_version: System Version
chassis_vendor: Chassis Manufacture
chassis_version: Chassis Version
bios_vendor: American Megatrends Inc.
bios_version: 2106   
board_vendor: ASUSTeK Computer INC.
board_name: M4A88T-M
board_version: Rev X.0x

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages linux-image-2.6.32-5-amd64 depends on:
ii  debconf [debconf-2.0]         1.5.35     Debian configuration management sy
ii  initramfs-tools [linux-initra 0.98.4     tools for generating an initramfs
ii  linux-base                    2.6.32-23  Linux image base package
ii  module-init-tools             3.12-1     tools for managing Linux kernel mo

Versions of packages linux-image-2.6.32-5-amd64 recommends:
ii  firmware-linux-free           2.6.32-23  Binary firmware for various driver

Versions of packages linux-image-2.6.32-5-amd64 suggests:
pn  grub | lilo                   <none>     (no description available)
ii  linux-doc-2.6.32              2.6.32-23  Linux kernel specific documentatio

Versions of packages linux-image-2.6.32-5-amd64 is related to:
pn  firmware-bnx2                 <none>     (no description available)
pn  firmware-bnx2x                <none>     (no description available)
pn  firmware-ipw2x00              <none>     (no description available)
pn  firmware-ivtv                 <none>     (no description available)
pn  firmware-iwlwifi              <none>     (no description available)
ii  firmware-linux                0.26       Binary firmware for various driver
ii  firmware-linux-nonfree        0.26       Binary firmware for various driver
pn  firmware-qlogic               <none>     (no description available)
pn  firmware-ralink               <none>     (no description available)
pn  xen-hypervisor                <none>     (no description available)

-- debconf information excluded

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