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From 848cad38da6c727c91f0fcb8052f9402de598737 Mon Sep 17 00:00:00 2001
From: Zhang Tianxing <zhangtianxing3@huawei.com>
Date: Mon, 13 Sep 2021 17:32:11 +0800
Subject: [PATCH] fix lsetxattr error in container
The digest list plugin in rpm will set security.ima xattr to IMA digest lists
when installing or updating an rpm package. However, in a container without
CAP_SYS_ADMIN, we'll get error messages when calling lsetxattr.
This patch is to skip lsetxattr when CAP_SYS_ADMIN is missing.
Signed-off-by: Zhang Tianxing <zhangtianxing3@huawei.com>
---
plugins/digest_list.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/plugins/digest_list.c b/plugins/digest_list.c
index 6bc9415..2d14463 100644
--- a/plugins/digest_list.c
+++ b/plugins/digest_list.c
@@ -12,6 +12,7 @@
#include <sys/stat.h>
#include <openssl/sha.h>
#include <sys/xattr.h>
+#include <sys/capability.h>
#include <linux/xattr.h>
#include <asm/byteorder.h>
#include <sys/wait.h>
@@ -370,6 +371,10 @@ static int process_digest_list(rpmte te, int parser)
int digest_list_signed = 0;
struct stat st;
ssize_t size;
+ struct __user_cap_header_struct cap_header_data;
+ cap_user_header_t cap_header = &cap_header_data;
+ struct __user_cap_data_struct cap_data_data;
+ cap_user_data_t cap_data = &cap_data_data;
rpmRC ret = RPMRC_OK;
path = malloc(PATH_MAX);
@@ -435,7 +440,21 @@ static int process_digest_list(rpmte te, int parser)
ret = RPMRC_FAIL;
goto out;
}
+ }
+ /* don't call lsetxattr without CAP_SYS_ADMIN */
+ cap_header->pid = getpid();
+ cap_header->version = _LINUX_CAPABILITY_VERSION_1;
+ if (capget(cap_header, cap_data) < 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ if (!(cap_data->effective & CAP_TO_MASK(CAP_SYS_ADMIN))) {
+ ret = -EPERM;
+ goto out;
+ }
+
+ if (!digest_list_signed) {
/* Write RPM header sig to security.ima */
ret = write_rpm_digest_list_ima_xattr(te, path);
} else {
--
2.27.0
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