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[PATCH 1/5] EFI: avoid OOB config file reads
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 24 Mar 2026 17:36:22 +0100
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- Cc: Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
- Delivery-date: Tue, 24 Mar 2026 16:36:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
The message emitted by pre_parse() pretty clearly states the intention.
Make sure we actually do so.
Fixes: bf6501a62e80 ("x86-64: EFI boot code")
Reported-by: Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -907,8 +907,13 @@ static void __init pre_parse(const struc
start = 0;
}
if ( file->size && end[-1] )
+ {
PrintStr(L"No newline at end of config file,"
" last line will be ignored.\r\n");
+
+ for ( UINTN pos = file->size; pos-- && *--end; )
+ *end = 0;
+ }
}
static void __init init_secure_boot_mode(void)
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