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From 61c761bc2c35fb244d46fbbde97161f5927071dc Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@us.ibm.com>
Date: Tue, 25 Oct 2016 15:09:49 -0400
Subject: [PATCH] dracut-install: preserve extended attributes when copying
files
Preserve extended attributes when copying files using dracut-install.
The copying of extended attributes avoids file execution denials when
the Linux Integrity Measurement's Appraisal mode is active. In that mode
executables need their file signatures copied. In particular, this patch
solves the problem that dependent libaries are not included in the
initramfs since the copied programs could not be executed due to missing
signatures. The following audit record shows the type of failure that
is now prevented:
type=INTEGRITY_DATA msg=audit(1477409025.492:30065): pid=922 uid=0
auid=4294967295 ses=4294967295
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
op="appraise_data" cause="IMA-signature-required"
comm="ld-linux-x86-64"
name="/var/tmp/dracut.R6ySa4/initramfs/usr/bin/journalctl"
dev="dm-0" ino=37136 res=0
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
install/dracut-install.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/install/dracut-install.c b/install/dracut-install.c
index fe30bba..c0f1c17 100644
--- a/install/dracut-install.c
+++ b/install/dracut-install.c
@@ -294,7 +294,7 @@ static int cp(const char *src, const char *dst)
normal_copy:
pid = fork();
if (pid == 0) {
- execlp("cp", "cp", "--reflink=auto", "--sparse=auto", "--preserve=mode,timestamps", "-fL", src, dst,
+ execlp("cp", "cp", "--reflink=auto", "--sparse=auto", "--preserve=mode,timestamps,xattr", "-fL", src, dst,
NULL);
_exit(EXIT_FAILURE);
}
@@ -302,7 +302,7 @@ static int cp(const char *src, const char *dst)
while (waitpid(pid, &ret, 0) < 0) {
if (errno != EINTR) {
ret = -1;
- log_error("Failed: cp --reflink=auto --sparse=auto --preserve=mode,timestamps -fL %s %s", src,
+ log_error("Failed: cp --reflink=auto --sparse=auto --preserve=mode,timestamps,xattr -fL %s %s", src,
dst);
break;
}
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