AuxXxilium/linux_dsm_epyc7002
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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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
This commit is contained in:
Linus Torvalds 2015-04-03 10:42:32 -07:00
commit 567cfea99a
5 changed files with 35 additions and 20 deletions
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5
MAINTAINERS
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@ -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*

16
arch/x86/kernel/entry_64.S
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@ -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 */

2
arch/x86/kernel/kgdb.c
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@ -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) },

10
arch/x86/kernel/reboot.c
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@ -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,

22
drivers/firmware/dmi_scan.c
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@ -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);