From: Thorsten Blum <blum@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Cc: Thorsten Blum <blum@kernel.org>,
"H. Peter Anvin" <hpa@linux.intel.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH RESEND] x86/realmode: Pad the embedded real-mode blob to a page boundary
Date: Sun, 8 Nov 2026 22:02:15 +0100 [thread overview]
Message-ID: <20261108210215.407893-3-blum@kernel.org> (raw)
setup_real_mode() copies the page-aligned size of the embedded real-mode
blob into low memory. However, real_mode_blob ends immediately before
real_mode_relocs, so the copy includes relocation data and potentially
other .init.data contents when the size of realmode.bin is not
page-aligned.
Pad real_mode_blob to a page boundary so the copy contains only the
real-mode binary and its padding.
Fixes: 084ee1c641a0 ("x86, realmode: Relocator for realmode code")
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Thorsten Blum <blum@kernel.org>
---
arch/x86/realmode/rmpiggy.S | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/realmode/rmpiggy.S b/arch/x86/realmode/rmpiggy.S
index c8fef76743f6..ce5350241238 100644
--- a/arch/x86/realmode/rmpiggy.S
+++ b/arch/x86/realmode/rmpiggy.S
@@ -12,6 +12,7 @@
SYM_DATA_START(real_mode_blob)
.incbin "arch/x86/realmode/rm/realmode.bin"
+ .balign PAGE_SIZE
SYM_DATA_END_LABEL(real_mode_blob, SYM_L_GLOBAL, real_mode_blob_end)
SYM_DATA_START(real_mode_relocs)
reply other threads:[~2026-11-08 21:02 UTC|newest]
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