This is a note to let you know that I've just added the patch titled
Revert "efi: random: refresh non-volatile random seed when RNG is initialized"
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-efi-random-refresh-non-volatile-random-seed-when-rng-is-initialized.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 69cbeb61ff9093a9155cb19a36d633033f71093a Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 21 Jun 2023 10:58:46 -0700
Subject: Revert "efi: random: refresh non-volatile random seed when RNG is initialized"
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
commit 69cbeb61ff9093a9155cb19a36d633033f71093a upstream.
This reverts commit e7b813b32a42a3a6281a4fd9ae7700a0257c1d50 (and the
subsequent fix for it: 41a15855c1ee "efi: random: fix NULL-deref when
refreshing seed").
It turns otu to cause non-deterministic boot stalls on at least a HP
6730b laptop.
Reported-and-bisected-by: Sami Korkalainen <sami.korkalainen@xxxxxxxxx>
Link: https://lore.kernel.org/all/GQUnKz2al3yke5mB2i1kp3SzNHjK8vi6KJEh7rnLrOQ24OrlljeCyeWveLW9pICEmB9Qc8PKdNt3w1t_g3-Uvxq1l8Wj67PpoMeWDoH8PKk=@proton.me/
Cc: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/efi/efi.c | 21 ---------------------
1 file changed, 21 deletions(-)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -361,24 +361,6 @@ static void __init efi_debugfs_init(void
static inline void efi_debugfs_init(void) {}
#endif
-static void refresh_nv_rng_seed(struct work_struct *work)
-{
- u8 seed[EFI_RANDOM_SEED_SIZE];
-
- get_random_bytes(seed, sizeof(seed));
- efi.set_variable(L"RandomSeed", &LINUX_EFI_RANDOM_SEED_TABLE_GUID,
- EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS |
- EFI_VARIABLE_RUNTIME_ACCESS, sizeof(seed), seed);
- memzero_explicit(seed, sizeof(seed));
-}
-static int refresh_nv_rng_seed_notification(struct notifier_block *nb, unsigned long action, void *data)
-{
- static DECLARE_WORK(work, refresh_nv_rng_seed);
- schedule_work(&work);
- return NOTIFY_DONE;
-}
-static struct notifier_block refresh_nv_rng_seed_nb = { .notifier_call = refresh_nv_rng_seed_notification };
-
/*
* We register the efi subsystem with the firmware subsystem and the
* efivars subsystem with the efi subsystem, if the system was booted with
@@ -451,9 +433,6 @@ static int __init efisubsys_init(void)
platform_device_register_simple("efi_secret", 0, NULL, 0);
#endif
- if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
- execute_with_initialized_rng(&refresh_nv_rng_seed_nb);
-
return 0;
err_remove_group:
Patches currently in stable-queue which might be from torvalds@xxxxxxxxxxxxxxxxxxxx are
queue-6.3/revert-efi-random-refresh-non-volatile-random-seed-when-rng-is-initialized.patch
