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Groups > linux.kernel > #1325271
| From | tip-bot for Ard Biesheuvel <tipbot@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [tip:efi/core] efi: Add nonblocking option to efi_query_variable_store() |
| Date | 2016-02-03 12:40 +0100 |
| Message-ID | <qY3WY-1lI-91@gated-at.bofh.it> (permalink) |
| References | <qXuZc-112-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Commit-ID: ca0e30dcaa53a3fcb2dfdf74252d30bc40603eea
Gitweb: http://git.kernel.org/tip/ca0e30dcaa53a3fcb2dfdf74252d30bc40603eea
Author: Ard Biesheuvel <ard.biesheuvel@linaro.org>
AuthorDate: Mon, 1 Feb 2016 22:06:58 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 3 Feb 2016 11:31:04 +0100
efi: Add nonblocking option to efi_query_variable_store()
The function efi_query_variable_store() may be invoked by
efivar_entry_set_nonblocking(), which itself takes care to only
call a non-blocking version of the SetVariable() runtime
wrapper. However, efi_query_variable_store() may call the
SetVariable() wrapper directly, as well as the wrapper for
QueryVariableInfo(), both of which could deadlock in the same
way we are trying to prevent by calling
efivar_entry_set_nonblocking() in the first place.
So instead, modify efi_query_variable_store() to use the
non-blocking variants of QueryVariableInfo() (and give up rather
than free up space if the available space is below
EFI_MIN_RESERVE) if invoked with the 'nonblocking' argument set
to true.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1454364428-494-5-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/platform/efi/quirks.c | 33 ++++++++++++++++++++++++++++++++-
drivers/firmware/efi/vars.c | 16 ++++++++++++++--
include/linux/efi.h | 12 +++++++++---
3 files changed, 55 insertions(+), 6 deletions(-)
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 4535046..2326bf5 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -57,13 +57,41 @@ void efi_delete_dummy_variable(void)
}
/*
+ * In the nonblocking case we do not attempt to perform garbage
+ * collection if we do not have enough free space. Rather, we do the
+ * bare minimum check and give up immediately if the available space
+ * is below EFI_MIN_RESERVE.
+ *
+ * This function is intended to be small and simple because it is
+ * invoked from crash handler paths.
+ */
+static efi_status_t
+query_variable_store_nonblocking(u32 attributes, unsigned long size)
+{
+ efi_status_t status;
+ u64 storage_size, remaining_size, max_size;
+
+ status = efi.query_variable_info_nonblocking(attributes, &storage_size,
+ &remaining_size,
+ &max_size);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ if (remaining_size - size < EFI_MIN_RESERVE)
+ return EFI_OUT_OF_RESOURCES;
+
+ return EFI_SUCCESS;
+}
+
+/*
* Some firmware implementations refuse to boot if there's insufficient space
* in the variable store. Ensure that we never use more than a safe limit.
*
* Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
* store.
*/
-efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
+efi_status_t efi_query_variable_store(u32 attributes, unsigned long size,
+ bool nonblocking)
{
efi_status_t status;
u64 storage_size, remaining_size, max_size;
@@ -71,6 +99,9 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
return 0;
+ if (nonblocking)
+ return query_variable_store_nonblocking(attributes, size);
+
status = efi.query_variable_info(attributes, &storage_size,
&remaining_size, &max_size);
if (status != EFI_SUCCESS)
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index 70a0fb1..d2a4962 100644
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -234,7 +234,18 @@ check_var_size(u32 attributes, unsigned long size)
if (!fops->query_variable_store)
return EFI_UNSUPPORTED;
- return fops->query_variable_store(attributes, size);
+ return fops->query_variable_store(attributes, size, false);
+}
+
+static efi_status_t
+check_var_size_nonblocking(u32 attributes, unsigned long size)
+{
+ const struct efivar_operations *fops = __efivars->ops;
+
+ if (!fops->query_variable_store)
+ return EFI_UNSUPPORTED;
+
+ return fops->query_variable_store(attributes, size, true);
}
static int efi_status_to_err(efi_status_t status)
@@ -615,7 +626,8 @@ efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor,
if (!spin_trylock_irqsave(&__efivars->lock, flags))
return -EBUSY;
- status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
+ status = check_var_size_nonblocking(attributes,
+ size + ucs2_strsize(name, 1024));
if (status != EFI_SUCCESS) {
spin_unlock_irqrestore(&__efivars->lock, flags);
return -ENOSPC;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index ad1e177..09f1559 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -525,7 +525,9 @@ typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules,
unsigned long count,
u64 *max_size,
int *reset_type);
-typedef efi_status_t efi_query_variable_store_t(u32 attributes, unsigned long size);
+typedef efi_status_t efi_query_variable_store_t(u32 attributes,
+ unsigned long size,
+ bool nonblocking);
void efi_native_runtime_setup(void);
@@ -881,13 +883,17 @@ extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if pos
#ifdef CONFIG_X86
extern void efi_late_init(void);
extern void efi_free_boot_services(void);
-extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size);
+extern efi_status_t efi_query_variable_store(u32 attributes,
+ unsigned long size,
+ bool nonblocking);
extern void efi_find_mirror(void);
#else
static inline void efi_late_init(void) {}
static inline void efi_free_boot_services(void) {}
-static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
+static inline efi_status_t efi_query_variable_store(u32 attributes,
+ unsigned long size,
+ bool nonblocking)
{
return EFI_SUCCESS;
}
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[GIT PULL 00/14] EFI changes for v4.6 Matt Fleming <matt@codeblueprint.co.uk> - 2016-02-01 23:20 +0100
[PATCH 02/14] efi: Remove redundant efi_set_variable_nonblocking prototype Matt Fleming <matt@codeblueprint.co.uk> - 2016-02-01 23:20 +0100
[tip:efi/core] efi: Remove redundant efi_set_variable_nonblocking () prototype tip-bot for Ard Biesheuvel <tipbot@zytor.com> - 2016-02-03 12:40 +0100
[PATCH 05/14] efi: runtime-wrappers: Remove out of date comment regarding in_nmi() Matt Fleming <matt@codeblueprint.co.uk> - 2016-02-01 23:20 +0100
[tip:efi/core] efi/runtime-wrappers: Remove out of date comment regarding in_nmi() tip-bot for Ard Biesheuvel <tipbot@zytor.com> - 2016-02-03 12:40 +0100
[PATCH 04/14] efi: Add nonblocking option to efi_query_variable_store() Matt Fleming <matt@codeblueprint.co.uk> - 2016-02-01 23:20 +0100
[tip:efi/core] efi: Add nonblocking option to efi_query_variable_store() tip-bot for Ard Biesheuvel <tipbot@zytor.com> - 2016-02-03 12:40 +0100
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