[Stable-8.2.9 26/45] x86/loader: only patch linux kernels

[Michael Tokarev]

If the binary loaded via -kernel is *not* a linux kernel (in which
case protocol == 0), do not patch the linux kernel header fields.

It's (a) pointless and (b) might break binaries by random patching
and (c) changes the binary hash which in turn breaks secure boot
verification.

Background: OVMF happily loads and runs not only linux kernels but
any efi binary via direct kernel boot.

Note: Breaking the secure boot verification is a problem for linux
kernels too, but fixed that is left for another day ...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20240905141211.1253307-3-kraxel@redhat.com>
(cherry picked from commit 57e2cc9abf5da38f600354fe920ff20e719607b4)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: it is in hw/i386/x86.c not hw/i386/x86-common.c in 8.2.x)

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 2b6291ad8d..672de72762 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -1105,7 +1105,7 @@ void x86_load_linux(X86MachineState *x86ms,
      * kernel on the other side of the fw_cfg interface matches the hash of the
      * file the user passed in.
      */
-    if (!sev_enabled()) {
+    if (!sev_enabled() && protocol > 0) {
         memcpy(setup, header, MIN(sizeof(header), setup_size));
     }
 
-- 
2.39.5