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Check for LEGACY_VSYSCALL_* options

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Chosing LEGACY_VSYSCALL_NONE (over NATIVE or EMULATE) will mean that binaries
using eglibc <= 2.13 will not run (segfault).

Fixes #28705.

Signed-off-by: Ian Campbell <ian.campbell@docker.com>
This commit is contained in:
Ian Campbell 2016-11-24 11:39:05 +00:00
parent e47ca825d1
commit 163db04452
1 changed files with 17 additions and 0 deletions
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17
contrib/check-config.sh
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@ -222,6 +222,23 @@ echo 'Optional Features:'
echo " $(wrap_color '(note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")' bold black)"
fi
}
{
if is_set LEGACY_VSYSCALL_NATIVE; then
echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled'
elif is_set LEGACY_VSYSCALL_EMULATE; then
echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled'
elif is_set LEGACY_VSYSCALL_NONE; then
echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled'
echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)"
echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)"
echo " $(wrap_color ' on kernel command line. Note that this will disable ASLR for the,' bold black)"
echo " $(wrap_color ' VDSO which may assist in exploiting security vulnerabilities.)' bold black)"
# else Older kernels (prior to 3dc33bd30f3e, released in v4.40-rc1) do
# not have these LEGACY_VSYSCALL options and are effectively
# LEGACY_VSYSCALL_EMULATE. Even older kernels are presumably
# effectively LEGACY_VSYSCALL_NATIVE.
fi
}
if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -le 5 ]; then
check_flags MEMCG_KMEM