@@ -1151,3 +1151,60 @@ void __weak arch_kexec_protect_crashkres(void)
void __weak arch_kexec_unprotect_crashkres(void)
{}
+
+/**
+ * kexec_cmdline_prepend_img_name - prepare the buffer with cmdline
+ * that needs to be measured
+ * @outbuf - out buffer that contains the formated string
+ * @kernel_fd - the file identifier for the kerenel image
+ * @cmdline_ptr - ptr to the cmdline buffer
+ * @cmdline_len - len of the buffer.
+ *
+ * This generates a buffer in the format Kerenelfilename::cmdline
+ *
+ * On success return 0.
+ * On failure return -EINVAL.
+ */
+int kexec_cmdline_prepend_img_name(char **outbuf, int kernel_fd,
+ const char *cmdline_ptr,
+ unsigned long cmdline_len)
+{
+ int ret = -EINVAL;
+ struct fd f = {};
+ int size = 0;
+ char *buf = NULL;
+ char delimiter[] = "::";
+
+ if (!outbuf || !cmdline_ptr)
+ goto out;
+
+ f = fdget(kernel_fd);
+ if (!f.file)
+ goto out;
+
+ size = (f.file->f_path.dentry->d_name.len + cmdline_len - 1+
+ ARRAY_SIZE(delimiter)) - 1;
+
+ buf = kzalloc(size, GFP_KERNEL);
+ if (!buf)
+ goto out;
+
+ memcpy(buf, f.file->f_path.dentry->d_name.name,
+ f.file->f_path.dentry->d_name.len);
+ memcpy(buf + f.file->f_path.dentry->d_name.len,
+ delimiter, ARRAY_SIZE(delimiter) - 1);
+ memcpy(buf + f.file->f_path.dentry->d_name.len +
+ ARRAY_SIZE(delimiter) - 1,
+ cmdline_ptr, cmdline_len - 1);
+
+ *outbuf = buf;
+ ret = size;
+
+ pr_debug("kexec cmdline buff: %s\n", buf);
+
+out:
+ if (f.file)
+ fdput(f);
+
+ return ret;
+}
@@ -126,6 +126,8 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
int ret = 0;
void *ldata;
loff_t size;
+ char *buff_to_measure = NULL;
+ int buff_to_measure_size = 0;
ret = kernel_read_file_from_fd(kernel_fd, &image->kernel_buf,
&size, INT_MAX, READING_KEXEC_IMAGE);
@@ -183,8 +185,13 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
goto out;
}
- ima_buffer_check(image->cmdline_buf, cmdline_len - 1,
- "kexec_cmdline");
+ /* IMA measures the cmdline args passed to the next kernel*/
+ buff_to_measure_size = kexec_cmdline_prepend_img_name(&buff_to_measure,
+ kernel_fd, image->cmdline_buf, image->cmdline_buf_len);
+
+ ima_buffer_check(buff_to_measure, buff_to_measure_size,
+ "kexec_cmdline");
+
}
/* Call arch image load handlers */
@@ -200,6 +207,9 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
/* In case of error, free up all allocated memory in this function */
if (ret)
kimage_file_post_load_cleanup(image);
+
+ kfree(buff_to_measure);
+
return ret;
}
@@ -11,6 +11,9 @@ int kimage_load_segment(struct kimage *image, struct kexec_segment *segment);
void kimage_terminate(struct kimage *image);
int kimage_is_destination_range(struct kimage *image,
unsigned long start, unsigned long end);
+int kexec_cmdline_prepend_img_name(char **outbuf, int kernel_fd,
+ const char *cmdline_ptr,
+ unsigned long cmdline_len);
extern struct mutex kexec_mutex;