Linux-EFI Archive on lore.kernel.org
 help / color / Atom feed
From: Hans de Goede <hdegoede@redhat.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
	Peter Huewe <peterhuewe@gmx.de>,
	x86@kernel.org, linux-efi@vger.kernel.org,
	linux-integrity@vger.kernel.org,
	Matthew Garrett <mjg59@google.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Subject: [PATCH 5.3 regression fix] efi-stub: Fix get_efi_config_table on mixed-mode setups
Date: Wed,  7 Aug 2019 23:59:03 +0200
Message-ID: <20190807215903.24990-1-hdegoede@redhat.com> (raw)

Fix get_efi_config_table using the wrong structs when booting a
64 bit kernel on 32 bit firmware.

Cc: Matthew Garrett <mjg59@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Fixes: 82d736ac56d7 ("Abstract out support for locating an EFI config table")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 .../firmware/efi/libstub/efi-stub-helper.c    | 38 +++++++++++++------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 1db780c0f07b..3caae7f2cf56 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -927,17 +927,33 @@ efi_status_t efi_exit_boot_services(efi_system_table_t *sys_table_arg,
 	return status;
 }
 
+#define GET_EFI_CONFIG_TABLE(bits)					\
+static void *get_efi_config_table##bits(efi_system_table_t *_sys_table,	\
+					efi_guid_t guid)		\
+{									\
+	efi_system_table_##bits##_t *sys_table;				\
+	efi_config_table_##bits##_t *tables;				\
+	int i;								\
+									\
+	sys_table = (typeof(sys_table))_sys_table;			\
+	tables = (typeof(tables))(unsigned long)sys_table->tables;	\
+									\
+	for (i = 0; i < sys_table->nr_tables; i++) {			\
+		if (efi_guidcmp(tables[i].guid, guid) != 0)		\
+			continue;					\
+									\
+		return (void *)(unsigned long)tables[i].table;		\
+	}								\
+									\
+	return NULL;							\
+}
+GET_EFI_CONFIG_TABLE(32)
+GET_EFI_CONFIG_TABLE(64)
+
 void *get_efi_config_table(efi_system_table_t *sys_table, efi_guid_t guid)
 {
-	efi_config_table_t *tables = (efi_config_table_t *)sys_table->tables;
-	int i;
-
-	for (i = 0; i < sys_table->nr_tables; i++) {
-		if (efi_guidcmp(tables[i].guid, guid) != 0)
-			continue;
-
-		return (void *)tables[i].table;
-	}
-
-	return NULL;
+	if (efi_is_64bit())
+		return get_efi_config_table64(sys_table, guid);
+	else
+		return get_efi_config_table32(sys_table, guid);
 }
-- 
2.22.0


             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07 21:59 Hans de Goede [this message]
2019-08-07 23:03 ` Matthew Garrett
2019-08-08  7:34   ` Ard Biesheuvel
2019-08-08 15:11 ` Jarkko Sakkinen

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190807215903.24990-1-hdegoede@redhat.com \
    --to=hdegoede@redhat.com \
    --cc=ard.biesheuvel@linaro.org \
    --cc=jarkko.sakkinen@linux.intel.com \
    --cc=linux-efi@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=mjg59@google.com \
    --cc=peterhuewe@gmx.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-EFI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-efi/0 linux-efi/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-efi linux-efi/ https://lore.kernel.org/linux-efi \
		linux-efi@vger.kernel.org
	public-inbox-index linux-efi

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-efi


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git