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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-16 11:49:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-16 11:49:58 -0700
commit1ec4013bab89058dcc594dfe7b5a20f5d46bbc5f (patch)
tree4db305a87f3a36bea2a2296557faaec76cdfb9e6 /tools
parent3c69914b4c7b0b72ff0275c14743778057ee8a6e (diff)
parente10337daefecb47209fd2af5f4fab0d1a370737f (diff)
downloadlinux-1ec4013bab89058dcc594dfe7b5a20f5d46bbc5f.tar.bz2
Merge tag 'safesetid-5.3' of git://github.com/micah-morton/linux
Pull safesetid updates from Micah Morton: "These changes from Jann Horn fix a couple issues in the recently added SafeSetID LSM: - There was a simple logic bug in one of the hooks for the LSM where the code was incorrectly returning early in some cases before all security checks had been passed. - There was a more high level issue with how this LSM gets configured that could allow for a program to bypass the security restrictions by switching to an allowed UID and then again to any other UID on the system if the target UID of the first transition is unconstrained on the system. Luckily this is an easy fix that we now enforce at the time the LSM gets configured. There are also some changes from Jann that make policy updates for this LSM atomic. Kees Cook, Jann and myself have reviewed these changes and they look good from our point of view" * tag 'safesetid-5.3' of git://github.com/micah-morton/linux: LSM: SafeSetID: fix use of literal -1 in capable hook LSM: SafeSetID: verify transitive constrainedness LSM: SafeSetID: add read handler LSM: SafeSetID: rewrite userspace API to atomic updates LSM: SafeSetID: fix userns handling in securityfs LSM: SafeSetID: refactor policy parsing LSM: SafeSetID: refactor safesetid_security_capable() LSM: SafeSetID: refactor policy hash table LSM: SafeSetID: fix check for setresuid(new1, new2, new3) LSM: SafeSetID: fix pr_warn() to include newline
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/safesetid/safesetid-test.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/tools/testing/selftests/safesetid/safesetid-test.c b/tools/testing/selftests/safesetid/safesetid-test.c
index 892c8e8b1b8b..8f40c6ecdad1 100644
--- a/tools/testing/selftests/safesetid/safesetid-test.c
+++ b/tools/testing/selftests/safesetid/safesetid-test.c
@@ -142,23 +142,19 @@ static void ensure_securityfs_mounted(void)
static void write_policies(void)
{
+ static char *policy_str =
+ "1:2\n"
+ "1:3\n"
+ "2:2\n"
+ "3:3\n";
ssize_t written;
int fd;
fd = open(add_whitelist_policy_file, O_WRONLY);
if (fd < 0)
die("cant open add_whitelist_policy file\n");
- written = write(fd, "1:2", strlen("1:2"));
- if (written != strlen("1:2")) {
- if (written >= 0) {
- die("short write to %s\n", add_whitelist_policy_file);
- } else {
- die("write to %s failed: %s\n",
- add_whitelist_policy_file, strerror(errno));
- }
- }
- written = write(fd, "1:3", strlen("1:3"));
- if (written != strlen("1:3")) {
+ written = write(fd, policy_str, strlen(policy_str));
+ if (written != strlen(policy_str)) {
if (written >= 0) {
die("short write to %s\n", add_whitelist_policy_file);
} else {