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authorLinus Torvalds <torvalds@linux-foundation.org>2023-06-21 20:58:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-06-21 20:58:46 +0300
commit69cbeb61ff9093a9155cb19a36d633033f71093a (patch)
tree1b8fb4ba6e7488dbafc6a70a01ef34fd3e94408d /drivers/firmware
parent2214170caabbff673935eb046a7edf4621213931 (diff)
downloadlinux-69cbeb61ff9093a9155cb19a36d633033f71093a.tar.xz
Revert "efi: random: refresh non-volatile random seed when RNG is initialized"
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@proton.me> Link: https://lore.kernel.org/all/GQUnKz2al3yke5mB2i1kp3SzNHjK8vi6KJEh7rnLrOQ24OrlljeCyeWveLW9pICEmB9Qc8PKdNt3w1t_g3-Uvxq1l8Wj67PpoMeWDoH8PKk=@proton.me/ Cc: Jason A. Donenfeld <Jason@zx2c4.com> Cc: Bagas Sanjaya <bagasdotme@gmail.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/efi/efi.c21
1 files changed, 0 insertions, 21 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index abeff7dc0b58..34b9e7876538 100644
--- 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: