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authorPeter Zijlstra <peterz@infradead.org>2022-03-03 14:23:23 +0300
committerBorislav Petkov <bp@suse.de>2022-03-08 16:15:25 +0300
commit5adf349439d29f92467e864f728dfc23180f3ef9 (patch)
tree57fb5f317717fc95cf8738bb0bcd516010c359f2 /arch
parentffb217a13a2eaf6d5bd974fc83036a53ca69f1e2 (diff)
downloadlinux-5adf349439d29f92467e864f728dfc23180f3ef9.tar.xz
x86/module: Fix the paravirt vs alternative order
Ever since commit 4e6292114c74 ("x86/paravirt: Add new features for paravirt patching") there is an ordering dependency between patching paravirt ops and patching alternatives, the module loader still violates this. Fixes: 4e6292114c74 ("x86/paravirt: Add new features for paravirt patching") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20220303112825.068773913@infradead.org
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/module.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 95fa745e310a..96d7c27b7093 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -273,6 +273,14 @@ int module_finalize(const Elf_Ehdr *hdr,
retpolines = s;
}
+ /*
+ * See alternative_instructions() for the ordering rules between the
+ * various patching types.
+ */
+ if (para) {
+ void *pseg = (void *)para->sh_addr;
+ apply_paravirt(pseg, pseg + para->sh_size);
+ }
if (retpolines) {
void *rseg = (void *)retpolines->sh_addr;
apply_retpolines(rseg, rseg + retpolines->sh_size);
@@ -290,11 +298,6 @@ int module_finalize(const Elf_Ehdr *hdr,
tseg, tseg + text->sh_size);
}
- if (para) {
- void *pseg = (void *)para->sh_addr;
- apply_paravirt(pseg, pseg + para->sh_size);
- }
-
/* make jump label nops */
jump_label_apply_nops(me);