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authorJason A. Donenfeld <Jason@zx2c4.com>2022-09-27 16:08:34 +0300
committerGeert Uytterhoeven <geert@linux-m68k.org>2022-09-28 23:16:44 +0300
commit7c236d93c6764dcaca7ab66d76768a044647876d (patch)
treec8b9aad19088e7e39fe84e923966454aa01bf302 /arch/m68k
parent15f9042311b0ab9c2904d50428f304a6229d6a02 (diff)
downloadlinux-7c236d93c6764dcaca7ab66d76768a044647876d.tar.xz
m68k: Process bootinfo records before saving them
The RNG seed boot record is memzeroed after processing, in order to preserve forward secrecy. By saving the bootinfo for procfs prior to that, forward secrecy is violated, since it becomes possible to recover past states. So, save the bootinfo block only after first processing them. Fixes: a1ee38ab1a75 ("m68k: virt: Use RNG seed from bootinfo block") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20220927130835.1629806-1-Jason@zx2c4.com Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/kernel/setup_mm.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 06ee394db610..78967c96ee8f 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -109,10 +109,9 @@ extern void paging_init(void);
static void __init m68k_parse_bootinfo(const struct bi_record *record)
{
+ const struct bi_record *first_record = record;
uint16_t tag;
- save_bootinfo(record);
-
while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
int unknown = 0;
const void *data = record->data;
@@ -182,6 +181,8 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record)
record = (struct bi_record *)((unsigned long)record + size);
}
+ save_bootinfo(first_record);
+
m68k_realnum_memory = m68k_num_memory;
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
if (m68k_num_memory > 1) {