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Commit 567cfea9 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a SYSRET single-stepping fix, a dmi-scan robustization
  fix, a reboot quirk and a kgdb fixlet"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  kgdb/x86: Fix reporting of 'si' in kgdb on x86_64
  x86/asm/entry/64: Disable opportunistic SYSRET if regs->flags has TF set
  x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk
  MAINTAINERS: Change the x86 microcode loader maintainer
  firmware: dmi_scan: Prevent dmi_num integer overflow
parents ec2e76b4 f59df35f

MAINTAINERS

+2 −3
Original line number Diff line number Diff line
@@ -637,8 +637,7 @@ F: drivers/gpu/drm/radeon/radeon_kfd.h 
F:      include/uapi/linux/kfd_ioctl.h



AMD MICROCODE UPDATE SUPPORT

M:	Andreas Herrmann <herrmann.der.user@googlemail.com>

L:	amd64-microcode@amd64.org

M:	Borislav Petkov <bp@alien8.de>

S:	Maintained

F:	arch/x86/kernel/cpu/microcode/amd*
@@ -5095,7 +5094,7 @@ S: Supported 
F:	drivers/platform/x86/intel_menlow.c



INTEL IA32 MICROCODE UPDATE SUPPORT

M:	Tigran Aivazian <tigran@aivazian.fsnet.co.uk>

M:	Borislav Petkov <bp@alien8.de>

S:	Maintained

F:	arch/x86/kernel/cpu/microcode/core*

F:	arch/x86/kernel/cpu/microcode/intel*

arch/x86/kernel/entry_64.S

+15 −1
Original line number Diff line number Diff line
@@ -799,7 +799,21 @@ retint_swapgs: /* return to user-space */ 
	cmpq %r11,(EFLAGS-ARGOFFSET)(%rsp)	/* R11 == RFLAGS */

	jne opportunistic_sysret_failed



	testq $X86_EFLAGS_RF,%r11		/* sysret can't restore RF */

	/*

	 * SYSRET can't restore RF.  SYSRET can restore TF, but unlike IRET,

	 * restoring TF results in a trap from userspace immediately after

	 * SYSRET.  This would cause an infinite loop whenever #DB happens

	 * with register state that satisfies the opportunistic SYSRET

	 * conditions.  For example, single-stepping this user code:

	 *

	 *           movq $stuck_here,%rcx

	 *           pushfq

	 *           popq %r11

	 *   stuck_here:

	 *

	 * would never get past 'stuck_here'.

	 */

	testq $(X86_EFLAGS_RF|X86_EFLAGS_TF), %r11

	jnz opportunistic_sysret_failed



	/* nothing to check for RSP */

arch/x86/kernel/kgdb.c

+1 −1
Original line number Diff line number Diff line
@@ -72,7 +72,7 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = 
	{ "bx", 8, offsetof(struct pt_regs, bx) },

	{ "cx", 8, offsetof(struct pt_regs, cx) },

	{ "dx", 8, offsetof(struct pt_regs, dx) },

	{ "si", 8, offsetof(struct pt_regs, dx) },

	{ "si", 8, offsetof(struct pt_regs, si) },

	{ "di", 8, offsetof(struct pt_regs, di) },

	{ "bp", 8, offsetof(struct pt_regs, bp) },

	{ "sp", 8, offsetof(struct pt_regs, sp) },

arch/x86/kernel/reboot.c

+10 −0
Original line number Diff line number Diff line
@@ -183,6 +183,16 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = { 
		},

	},



	/* ASRock */

	{	/* Handle problems with rebooting on ASRock Q1900DC-ITX */

		.callback = set_pci_reboot,

		.ident = "ASRock Q1900DC-ITX",

		.matches = {

			DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),

			DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),

		},

	},



	/* ASUS */

	{	/* Handle problems with rebooting on ASUS P4S800 */

		.callback = set_bios_reboot,

drivers/firmware/dmi_scan.c

+7 −15
Original line number Diff line number Diff line
@@ -86,10 +86,13 @@ static void dmi_table(u8 *buf, u32 len, int num, 
	int i = 0;



	/*

	 *	Stop when we see all the items the table claimed to have

	 *	OR we run off the end of the table (also happens)

	 * Stop when we have seen all the items the table claimed to have

	 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker OR we run

	 * off the end of the table (should never happen but sometimes does

	 * on bogus implementations.)

	 */

	while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {

	while ((!num || i < num) &&

	       (data - buf + sizeof(struct dmi_header)) <= len) {

		const struct dmi_header *dm = (const struct dmi_header *)data;



		/*
@@ -529,21 +532,10 @@ static int __init dmi_smbios3_present(const u8 *buf) 
	if (memcmp(buf, "_SM3_", 5) == 0 &&

	    buf[6] < 32 && dmi_checksum(buf, buf[6])) {

		dmi_ver = get_unaligned_be16(buf + 7);

		dmi_num = 0;			/* No longer specified */

		dmi_len = get_unaligned_le32(buf + 12);

		dmi_base = get_unaligned_le64(buf + 16);



		/*

		 * The 64-bit SMBIOS 3.0 entry point no longer has a field

		 * containing the number of structures present in the table.

		 * Instead, it defines the table size as a maximum size, and

		 * relies on the end-of-table structure type (#127) to be used

		 * to signal the end of the table.

		 * So let's define dmi_num as an upper bound as well: each

		 * structure has a 4 byte header, so dmi_len / 4 is an upper

		 * bound for the number of structures in the table.

		 */

		dmi_num = dmi_len / 4;



		if (dmi_walk_early(dmi_decode) == 0) {

			pr_info("SMBIOS %d.%d present.\n",

				dmi_ver >> 8, dmi_ver & 0xFF);