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From 877774af9162dde25e314ff99a427dd28435c26a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Wed, 10 Jun 2015 15:19:03 -0400
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Subject: [PATCH] ima-setup: write policy one line at a time
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ima_write_policy() expects data to be written as one or more
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rules, no more than PAGE_SIZE at a time. Easiest way to ensure
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that we are not splitting rules is to read and write one line at
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a time.
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https://bugzilla.redhat.com/show_bug.cgi?id=1226948
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(cherry picked from commit 92994160afa888255a7ede525dd16e3f1e2ed10d)
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Cherry-picked from: 9299416
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Resolves: #1222517
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---
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 src/core/ima-setup.c | 41 +++++++++++++++++------------------------
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 1 file changed, 17 insertions(+), 24 deletions(-)
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diff --git a/src/core/ima-setup.c b/src/core/ima-setup.c
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index 1d4acfa3b1..81ce2cda90 100644
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--- a/src/core/ima-setup.c
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+++ b/src/core/ima-setup.c
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@@ -24,11 +24,6 @@
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 #include <unistd.h>
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 #include <stdio.h>
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 #include <errno.h>
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-#include <sys/types.h>
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-#include <sys/stat.h>
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-#include <fcntl.h>
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-#include <sys/stat.h>
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-#include <sys/mman.h>
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 #include "ima-setup.h"
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 #include "util.h"
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@@ -39,20 +34,19 @@
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 #define IMA_POLICY_PATH "/etc/ima/ima-policy"
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 int ima_setup(void) {
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-        int r = 0;
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-
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 #ifdef HAVE_IMA
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-        _cleanup_close_ int policyfd = -1, imafd = -1;
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-        struct stat st;
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-        char *policy;
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+        _cleanup_fclose_ FILE *input = NULL;
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+        _cleanup_close_ int imafd = -1;
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+        unsigned lineno = 0;
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+        char line[page_size()];
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         if (access(IMA_SECFS_DIR, F_OK) < 0) {
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                 log_debug("IMA support is disabled in the kernel, ignoring.");
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                 return 0;
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         }
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-        policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
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-        if (policyfd < 0) {
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+        input = fopen(IMA_POLICY_PATH, "re");
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+        if (!input) {
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                 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
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                                "Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m");
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                 return 0;
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@@ -69,20 +63,19 @@ int ima_setup(void) {
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                 return 0;
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         }
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-        if (fstat(policyfd, &st) < 0)
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-                return log_error_errno(errno, "Failed to fstat "IMA_POLICY_PATH": %m");
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+        FOREACH_LINE(line, input,
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+                     return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) {
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+                size_t len;
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-        policy = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
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-        if (policy == MAP_FAILED)
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-                return log_error_errno(errno, "Failed to mmap "IMA_POLICY_PATH": %m");
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+                len = strlen(line);
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+                lineno++;
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-        r = loop_write(imafd, policy, (size_t) st.st_size, false);
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-        if (r < 0)
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-                log_error_errno(r, "Failed to load the IMA custom policy file "IMA_POLICY_PATH": %m");
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-        else
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-                log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
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+                if (len > 0 && write(imafd, line, len) < 0)
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+                        return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m",
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+                                               lineno);
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+        }
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-        munmap(policy, st.st_size);
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+        log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
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 #endif /* HAVE_IMA */
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-        return r;
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+        return 0;
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 }