Somehow grsec (or probably PAX?) kills all 32-bit ELFs directly after exec*(), without any message indicating what's going on.
Note: All of this works fine on vanilla 2.6.32.8. The following is performed as root:
- Code: Select all
$ file /lib32/ld-2.11.so
/lib32/ld-2.11.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
$ /lib32/ld-2.11.so
Killed
$ strace /lib32/ld-2.11.so
execve("/lib32/ld-2.11.so", ["/lib32/ld-2.11.so"], [/* 32 vars */] <unfinished ...>
+++ killed by SIGKILL +++
Killed
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$ file /lib64/ld-2.11.so
/lib64/ld-2.11.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped
$ /lib64/ld-2.11.so
Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]
...
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$ echo 'int main() { printf("foo\n"); }' > foo.c
$ gcc -w -m32 foo.c; file a.out; ./a.out
a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
Killed
$ gcc -w -m64 foo.c; file a.out; ./a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
foo
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$ paxctl -v a.out
PaX control v0.5
Copyright 2004,2005,2006,2007 PaX Team <pageexec@freemail.hu>
- PaX flags: -------x-e-- [a.out]
RANDEXEC is disabled
EMUTRAMP is disabled
- Code: Select all
CONFIG_64BIT=y
CONFIG_X86_64=y
CONFIG_X86=y
CONFIG_OUTPUT_FORMAT="elf64-x86-64"
CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig"
CONFIG_BINFMT_ELF=y
CONFIG_COMPAT_BINFMT_ELF=y
CONFIG_IA32_EMULATION=y
#
# Grsecurity
#
CONFIG_GRKERNSEC=y
# CONFIG_GRKERNSEC_LOW is not set
# CONFIG_GRKERNSEC_MEDIUM is not set
# CONFIG_GRKERNSEC_HIGH is not set
CONFIG_GRKERNSEC_CUSTOM=y
#
# Address Space Protection
#
CONFIG_GRKERNSEC_KMEM=y
CONFIG_GRKERNSEC_IO=y
CONFIG_GRKERNSEC_PROC_MEMMAP=y
CONFIG_GRKERNSEC_BRUTE=y
CONFIG_GRKERNSEC_MODHARDEN=y
CONFIG_GRKERNSEC_HIDESYM=y
#
# Role Based Access Control Options
#
CONFIG_GRKERNSEC_NO_RBAC=y
CONFIG_GRKERNSEC_ACL_HIDEKERN=y
CONFIG_GRKERNSEC_ACL_MAXTRIES=3
CONFIG_GRKERNSEC_ACL_TIMEOUT=30
#
# Filesystem Protections
#
CONFIG_GRKERNSEC_PROC=y
# CONFIG_GRKERNSEC_PROC_USER is not set
CONFIG_GRKERNSEC_PROC_USERGROUP=y
CONFIG_GRKERNSEC_PROC_GID=9000
CONFIG_GRKERNSEC_PROC_ADD=y
CONFIG_GRKERNSEC_LINK=y
CONFIG_GRKERNSEC_FIFO=y
# CONFIG_GRKERNSEC_ROFS is not set
CONFIG_GRKERNSEC_CHROOT=y
# CONFIG_GRKERNSEC_CHROOT_MOUNT is not set
# CONFIG_GRKERNSEC_CHROOT_DOUBLE is not set
CONFIG_GRKERNSEC_CHROOT_PIVOT=y
CONFIG_GRKERNSEC_CHROOT_CHDIR=y
# CONFIG_GRKERNSEC_CHROOT_CHMOD is not set
CONFIG_GRKERNSEC_CHROOT_FCHDIR=y
CONFIG_GRKERNSEC_CHROOT_MKNOD=y
CONFIG_GRKERNSEC_CHROOT_SHMAT=y
CONFIG_GRKERNSEC_CHROOT_UNIX=y
# CONFIG_GRKERNSEC_CHROOT_FINDTASK is not set
CONFIG_GRKERNSEC_CHROOT_NICE=y
CONFIG_GRKERNSEC_CHROOT_SYSCTL=y
# CONFIG_GRKERNSEC_CHROOT_CAPS is not set
#
# Kernel Auditing
#
# CONFIG_GRKERNSEC_AUDIT_GROUP is not set
# CONFIG_GRKERNSEC_EXECLOG is not set
CONFIG_GRKERNSEC_RESLOG=y
# CONFIG_GRKERNSEC_CHROOT_EXECLOG is not set
# CONFIG_GRKERNSEC_AUDIT_CHDIR is not set
CONFIG_GRKERNSEC_AUDIT_MOUNT=y
CONFIG_GRKERNSEC_SIGNAL=y
CONFIG_GRKERNSEC_FORKFAIL=y
# CONFIG_GRKERNSEC_TIME is not set
# CONFIG_GRKERNSEC_PROC_IPADDR is not set
#
# Executable Protections
#
CONFIG_GRKERNSEC_EXECVE=y
CONFIG_GRKERNSEC_DMESG=y
CONFIG_GRKERNSEC_HARDEN_PTRACE=y
CONFIG_GRKERNSEC_TPE=y
# CONFIG_GRKERNSEC_TPE_ALL is not set
# CONFIG_GRKERNSEC_TPE_INVERT is not set
CONFIG_GRKERNSEC_TPE_GID=45000
#
# Network Protections
#
CONFIG_GRKERNSEC_RANDNET=y
# CONFIG_GRKERNSEC_BLACKHOLE is not set
CONFIG_GRKERNSEC_SOCKET=y
CONFIG_GRKERNSEC_SOCKET_ALL=y
CONFIG_GRKERNSEC_SOCKET_ALL_GID=45001
CONFIG_GRKERNSEC_SOCKET_CLIENT=y
CONFIG_GRKERNSEC_SOCKET_CLIENT_GID=45002
CONFIG_GRKERNSEC_SOCKET_SERVER=y
CONFIG_GRKERNSEC_SOCKET_SERVER_GID=5003
#
# Sysctl support
#
CONFIG_GRKERNSEC_SYSCTL=y
CONFIG_GRKERNSEC_SYSCTL_ON=y
#
# Logging Options
#
CONFIG_GRKERNSEC_FLOODTIME=2
CONFIG_GRKERNSEC_FLOODBURST=4
#
# PaX
#
CONFIG_PAX=y
#
# PaX Control
#
CONFIG_PAX_SOFTMODE=y
# CONFIG_PAX_EI_PAX is not set
CONFIG_PAX_PT_PAX_FLAGS=y
# CONFIG_PAX_NO_ACL_FLAGS is not set
CONFIG_PAX_HAVE_ACL_FLAGS=y
# CONFIG_PAX_HOOK_ACL_FLAGS is not set
#
# Non-executable pages
#
# CONFIG_PAX_NOEXEC is not set
#
# Address Space Layout Randomization
#
CONFIG_PAX_ASLR=y
CONFIG_PAX_RANDUSTACK=y
CONFIG_PAX_RANDMMAP=y
#
# Miscellaneous hardening features
#
# CONFIG_PAX_MEMORY_SANITIZE is not set
# CONFIG_PAX_REFCOUNT is not set
# CONFIG_PAX_USERCOPY is not set
CONFIG_KEYS=y
# CONFIG_KEYS_DEBUG_PROC_KEYS is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITYFS is not set
# CONFIG_SECURITY_FILE_CAPABILITIES is not set
CONFIG_CRYPTO=y
Any ideas? Looks like a bug?
