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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2022-09-27 15:08:35 +0200 |
|---|---|---|
| committer |   Geert Uytterhoeven <geert@linux-m68k.org> | 2022-09-28 22:16:44 +0200 |
| commit | dc63a086daee92c63e392e4e7cd7ed61f3693026 (patch) | |
| tree | 587dc01cb12c5e104a71f321bbb8f573892d323e /arch/m68k/kernel/setup_mm.c | |
| parent | m68k: Process bootinfo records before saving them (diff) | |
| download | linux-dev-dc63a086daee92c63e392e4e7cd7ed61f3693026.tar.xz linux-dev-dc63a086daee92c63e392e4e7cd7ed61f3693026.zip | |
m68k: Rework BI_VIRT_RNG_SEED as BI_RNG_SEED
This is useful on !virt platforms for kexec, so change things from
BI_VIRT_RNG_SEED to be BI_RNG_SEED, and simply remove BI_VIRT_RNG_SEED
because it only ever lasted one release, and nothing is broken by not
having it. At the same time, keep a comment noting that it's been
removed, so that ID isn't reused. In addition, we previously documented
2-byte alignment, but 4-byte alignment is actually necessary, so update
that comment.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
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/20220927130835.1629806-2-Jason@zx2c4.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel/setup_mm.c')
| -rw-r--r-- | arch/m68k/kernel/setup_mm.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c index 78967c96ee8f..3a2bb2e8fdad 100644 --- a/arch/m68k/kernel/setup_mm.c +++ b/arch/m68k/kernel/setup_mm.c @@ -25,6 +25,7 @@ #include <linux/module.h> #include <linux/nvram.h> #include <linux/initrd.h> +#include <linux/random.h> #include <asm/bootinfo.h> #include <asm/byteorder.h> @@ -151,6 +152,17 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record) sizeof(m68k_command_line)); break; + case BI_RNG_SEED: { + u16 len = be16_to_cpup(data); + add_bootloader_randomness(data + 2, len); + /* + * Zero the data to preserve forward secrecy, and zero the + * length to prevent kexec from using it. + */ + memzero_explicit((void *)data, len + 2); + break; + } + default: if (MACH_IS_AMIGA) unknown = amiga_parse_bootinfo(record); |