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x86/static-call: provide a way to do very early static-call updates

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commit 0ef8047b737d7480a5d4c46d956e97c190f13050 upstream.

Add static_call_update_early() for updating static-call targets in
very early boot.

This will be needed for support of Xen guest type specific hypercall
functions.

This is part of XSA-466 / CVE-2024-53241.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Co-developed-by: Peter Zijlstra <peterz@infradead.org>
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juergen Gross
2024-11-29 16:15:54 +01:00
committed by Greg Kroah-Hartman
parent c6eef36436
commit fa0f23a60e
6 changed files with 56 additions and 16 deletions
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kernel/static_call_inline.c
+1 -1
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@@ -15,7 +15,7 @@ extern struct static_call_site __start_static_call_sites[],
extern struct static_call_tramp_key __start_static_call_tramp_key[],
__stop_static_call_tramp_key[];
static int static_call_initialized;
int static_call_initialized;
/*
* Must be called before early_initcall() to be effective.