You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

95 lines
3.4 KiB

From 877774af9162dde25e314ff99a427dd28435c26a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Wed, 10 Jun 2015 15:19:03 -0400
Subject: [PATCH] ima-setup: write policy one line at a time
ima_write_policy() expects data to be written as one or more
rules, no more than PAGE_SIZE at a time. Easiest way to ensure
that we are not splitting rules is to read and write one line at
a time.
https://bugzilla.redhat.com/show_bug.cgi?id=1226948
(cherry picked from commit 92994160afa888255a7ede525dd16e3f1e2ed10d)
Cherry-picked from: 9299416
Resolves: #1222517
---
src/core/ima-setup.c | 41 +++++++++++++++++------------------------
1 file changed, 17 insertions(+), 24 deletions(-)
diff --git a/src/core/ima-setup.c b/src/core/ima-setup.c
index 1d4acfa3b..81ce2cda9 100644
--- a/src/core/ima-setup.c
+++ b/src/core/ima-setup.c
@@ -24,11 +24,6 @@
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
#include "ima-setup.h"
#include "util.h"
@@ -39,20 +34,19 @@
#define IMA_POLICY_PATH "/etc/ima/ima-policy"
int ima_setup(void) {
- int r = 0;
-
#ifdef HAVE_IMA
- _cleanup_close_ int policyfd = -1, imafd = -1;
- struct stat st;
- char *policy;
+ _cleanup_fclose_ FILE *input = NULL;
+ _cleanup_close_ int imafd = -1;
+ unsigned lineno = 0;
+ char line[page_size()];
if (access(IMA_SECFS_DIR, F_OK) < 0) {
log_debug("IMA support is disabled in the kernel, ignoring.");
return 0;
}
- policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
- if (policyfd < 0) {
+ input = fopen(IMA_POLICY_PATH, "re");
+ if (!input) {
log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
"Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m");
return 0;
@@ -69,20 +63,19 @@ int ima_setup(void) {
return 0;
}
- if (fstat(policyfd, &st) < 0)
- return log_error_errno(errno, "Failed to fstat "IMA_POLICY_PATH": %m");
+ FOREACH_LINE(line, input,
+ return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) {
+ size_t len;
- policy = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
- if (policy == MAP_FAILED)
- return log_error_errno(errno, "Failed to mmap "IMA_POLICY_PATH": %m");
+ len = strlen(line);
+ lineno++;
- r = loop_write(imafd, policy, (size_t) st.st_size, false);
- if (r < 0)
- log_error_errno(r, "Failed to load the IMA custom policy file "IMA_POLICY_PATH": %m");
- else
- log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
+ if (len > 0 && write(imafd, line, len) < 0)
+ return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m",
+ lineno);
+ }
- munmap(policy, st.st_size);
+ log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
#endif /* HAVE_IMA */
- return r;
+ return 0;
}