Check that an image header matches the currently running kernel, and return
either a string describing the problem, or NULL.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/io.c | 39 +++++++++++++++++++++++++++++++++++++++
1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/kernel/power/io.c b/kernel/power/io.c
index d7c48e0..8c9c284 100644
--- a/kernel/power/io.c
+++ b/kernel/power/io.c
@@ -676,3 +676,42 @@ write_image_header_abort_no_cleanup:
return -1;
}
+/* sanity_check()
+ *
+ * Description: Perform a few checks, seeking to ensure that the kernel being
+ * booted matches the one suspended. They need to match so we can
+ * be _sure_ things will work. It is not absolutely impossible for
+ * resuming from a different kernel to work, just not assured.
+ * Arguments: Struct suspend_header. The header which was saved at suspend
+ * time.
+ */
+static char *sanity_check(struct suspend_header *sh)
+{
+ if (sh->version_code != LINUX_VERSION_CODE)
+ return "Incorrect kernel version.";
+
+ if (sh->num_physpages != num_physpages)
+ return "Incorrect memory size.";
+
+ if (strncmp(sh->machine, system_utsname.machine, 65))
+ return "Incorrect machine type.";
+
+ if (strncmp(sh->version, system_utsname.version, 65))
+ return "Right kernel version but wrong build number.";
+
+ if (sh->page_size != PAGE_SIZE)
+ return "Incorrect PAGE_SIZE.";
+
+ if (!test_suspend_state(SUSPEND_IGNORE_ROOTFS)) {
+ const struct super_block *sb;
+ list_for_each_entry(sb, &super_blocks, s_list) {
+ if ((!(sb->s_flags & MS_RDONLY)) &&
+ (sb->s_type->fs_flags & FS_REQUIRES_DEV))
+ return "Device backed fs has been mounted "
+ "rw prior to resume.";
+ }
+ }
+
+ return 0;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
