microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

A set of x86 fixes: 

- Use SYM_FUNC_START_WEAK in the mem* ASM functions instead of a
    combination of .weak and SYM_FUNC_START_LOCAL which makes LLVMs
    integrated assembler upset.
 
  - Correct the mitigation selection logic which prevented the related prctl
    to work correctly.
 
  - Make the UV5 hubless system work correctly by fixing up the malformed
    table entries and adding the missing ones.
 -----BEGIN PGP SIGNATURE-----
 
 iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAl+oDNYTHHRnbHhAbGlu
 dXRyb25peC5kZQAKCRCmGPVMDXSYoaN0EACPWY15k1YuAEIjiQxRBhq22J8Y6wNX
 Ui/rF2AZcAnNEJDTIyvjP6COnT9mjX/tuuluMaI6i/XY/9Xp5LpKvivkL2PXNN3X
 onW01ouIc1iYxXwQEVZvhYHsOyhkR9Z8yNG/q9I7xYAXNSZcAHwXVar4VlPBT7Ay
 iP75i8pGmb/NCc4oHNXuBp/dV/0/dCoLTndb5p5pX8oS60AAt9ZuK3IRc3ucayhI
 M4rTTEya1oY+ZNbtP4A4Jp7Qc/NGYDo6q04za+jcxZ5Gqacs+fk/PNuWgL1fZZtW
 sn1D+SMWEb55Xcsdy976b29FFU/DcOcf7TRASzyKgyPW5jg1dP6BZ6U0wpVV3KZw
 S2h5/pt48JZI7olrDsLQ0tzjALlk2CcFNrnRtOMDduHdw9wyz+Sg58lZYuvH3sXK
 5ZblWRJ3JiBNsNO0sA3kd4sp7xWQB3ey6mkYD8Vqb7zRIt8aXT9jqBxhDrP+Vqs/
 /UKv+BJfD6WxC0nQ4x6MS3g4sDvI+1SLfHSZ/UjWJ6NfYJW5/w429pFCaF73xCTd
 cqxja1dZYixn7ioFZjolMUdvuDiC5B2+5+RzEV87kaDzO9QZQyvsl7G74MSfwx6G
 DAydvuyJoxP2qVASobOBcVOzLQO7DsLzFZzJTttZcnkK2iprcz4qrsFLMxF9SxTD
 Amb8qck60dLfqA==
 =JdPk
 -----END PGP SIGNATURE-----

Merge tag 'x86-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "A set of x86 fixes:

   - Use SYM_FUNC_START_WEAK in the mem* ASM functions instead of a
     combination of .weak and SYM_FUNC_START_LOCAL which makes LLVMs
     integrated assembler upset

   - Correct the mitigation selection logic which prevented the related
     prctl to work correctly

   - Make the UV5 hubless system work correctly by fixing up the
     malformed table entries and adding the missing ones"

* tag 'x86-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/platform/uv: Recognize UV5 hubless system identifier
  x86/platform/uv: Remove spaces from OEM IDs
  x86/platform/uv: Fix missing OEM_TABLE_ID
  x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP
  x86/lib: Change .weak to SYM_FUNC_START_WEAK for arch/x86/lib/mem*_64.S
This commit is contained in:
Linus Torvalds 2020-11-08 10:09:36 -08:00
Родитель 100e38914a 801284f973
Коммит 40be821d62
5 изменённых файлов: 54 добавлений и 32 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

23
arch/x86/kernel/apic/x2apic_uv_x.c
Просмотреть файл

@ -290,6 +290,9 @@ static void __init uv_stringify(int len, char *to, char *from)
{
/* Relies on 'to' being NULL chars so result will be NULL terminated */
strncpy(to, from, len-1);
/* Trim trailing spaces */
(void)strim(to);
}
/* Find UV arch type entry in UVsystab */
@ -366,7 +369,7 @@ static int __init early_get_arch_type(void)
return ret;
}
static int __init uv_set_system_type(char *_oem_id)
static int __init uv_set_system_type(char *_oem_id, char *_oem_table_id)
{
/* Save OEM_ID passed from ACPI MADT */
uv_stringify(sizeof(oem_id), oem_id, _oem_id);
@ -386,13 +389,23 @@ static int __init uv_set_system_type(char *_oem_id)
/* (Not hubless), not a UV */
return 0;
/* Is UV hubless system */
uv_hubless_system = 0x01;
/* UV5 Hubless */
if (strncmp(uv_archtype, "NSGI5", 5) == 0)
uv_hubless_system |= 0x20;
/* UV4 Hubless: CH */
if (strncmp(uv_archtype, "NSGI4", 5) == 0)
uv_hubless_system = 0x11;
else if (strncmp(uv_archtype, "NSGI4", 5) == 0)
uv_hubless_system |= 0x10;
/* UV3 Hubless: UV300/MC990X w/o hub */
else
uv_hubless_system = 0x9;
uv_hubless_system |= 0x8;
/* Copy APIC type */
uv_stringify(sizeof(oem_table_id), oem_table_id, _oem_table_id);
pr_info("UV: OEM IDs %s/%s, SystemType %d, HUBLESS ID %x\n",
oem_id, oem_table_id, uv_system_type, uv_hubless_system);
@ -456,7 +469,7 @@ static int __init uv_acpi_madt_oem_check(char *_oem_id, char *_oem_table_id)
uv_cpu_info->p_uv_hub_info = &uv_hub_info_node0;
/* If not UV, return. */
if (likely(uv_set_system_type(_oem_id) == 0))
if (uv_set_system_type(_oem_id, _oem_table_id) == 0)
return 0;
/* Save and Decode OEM Table ID */

51
arch/x86/kernel/cpu/bugs.c
Просмотреть файл

@ -1254,6 +1254,14 @@ static int ssb_prctl_set(struct task_struct *task, unsigned long ctrl)
return 0;
}
static bool is_spec_ib_user_controlled(void)
{
return spectre_v2_user_ibpb == SPECTRE_V2_USER_PRCTL ||
spectre_v2_user_ibpb == SPECTRE_V2_USER_SECCOMP ||
spectre_v2_user_stibp == SPECTRE_V2_USER_PRCTL ||
spectre_v2_user_stibp == SPECTRE_V2_USER_SECCOMP;
}
static int ib_prctl_set(struct task_struct *task, unsigned long ctrl)
{
switch (ctrl) {
@ -1261,16 +1269,26 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl)
if (spectre_v2_user_ibpb == SPECTRE_V2_USER_NONE &&
spectre_v2_user_stibp == SPECTRE_V2_USER_NONE)
return 0;
/*
* Indirect branch speculation is always disabled in strict
* mode. It can neither be enabled if it was force-disabled
* by a previous prctl call.
* With strict mode for both IBPB and STIBP, the instruction
* code paths avoid checking this task flag and instead,
* unconditionally run the instruction. However, STIBP and IBPB
* are independent and either can be set to conditionally
* enabled regardless of the mode of the other.
*
* If either is set to conditional, allow the task flag to be
* updated, unless it was force-disabled by a previous prctl
* call. Currently, this is possible on an AMD CPU which has the
* feature X86_FEATURE_AMD_STIBP_ALWAYS_ON. In this case, if the
* kernel is booted with 'spectre_v2_user=seccomp', then
* spectre_v2_user_ibpb == SPECTRE_V2_USER_SECCOMP and
* spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED.
*/
if (spectre_v2_user_ibpb == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED ||
if (!is_spec_ib_user_controlled() ||
task_spec_ib_force_disable(task))
return -EPERM;
task_clear_spec_ib_disable(task);
task_update_spec_tif(task);
break;
@ -1283,10 +1301,10 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl)
if (spectre_v2_user_ibpb == SPECTRE_V2_USER_NONE &&
spectre_v2_user_stibp == SPECTRE_V2_USER_NONE)
return -EPERM;
if (spectre_v2_user_ibpb == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED)
if (!is_spec_ib_user_controlled())
return 0;
task_set_spec_ib_disable(task);
if (ctrl == PR_SPEC_FORCE_DISABLE)
task_set_spec_ib_force_disable(task);
@ -1351,20 +1369,17 @@ static int ib_prctl_get(struct task_struct *task)
if (spectre_v2_user_ibpb == SPECTRE_V2_USER_NONE &&
spectre_v2_user_stibp == SPECTRE_V2_USER_NONE)
return PR_SPEC_ENABLE;
else if (spectre_v2_user_ibpb == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED)
return PR_SPEC_DISABLE;
else if (spectre_v2_user_ibpb == SPECTRE_V2_USER_PRCTL ||
spectre_v2_user_ibpb == SPECTRE_V2_USER_SECCOMP ||
spectre_v2_user_stibp == SPECTRE_V2_USER_PRCTL ||
spectre_v2_user_stibp == SPECTRE_V2_USER_SECCOMP) {
else if (is_spec_ib_user_controlled()) {
if (task_spec_ib_force_disable(task))
return PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE;
if (task_spec_ib_disable(task))
return PR_SPEC_PRCTL | PR_SPEC_DISABLE;
return PR_SPEC_PRCTL | PR_SPEC_ENABLE;
} else
} else if (spectre_v2_user_ibpb == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT ||
spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED)
return PR_SPEC_DISABLE;
else
return PR_SPEC_NOT_AFFECTED;
}

4
arch/x86/lib/memcpy_64.S
Просмотреть файл

@ -16,8 +16,6 @@
* to a jmp to memcpy_erms which does the REP; MOVSB mem copy.
*/
.weak memcpy
/*
* memcpy - Copy a memory block.
*
@ -30,7 +28,7 @@
* rax original destination
*/
SYM_FUNC_START_ALIAS(__memcpy)
SYM_FUNC_START_LOCAL(memcpy)
SYM_FUNC_START_WEAK(memcpy)
ALTERNATIVE_2 "jmp memcpy_orig", "", X86_FEATURE_REP_GOOD, \
"jmp memcpy_erms", X86_FEATURE_ERMS

4
arch/x86/lib/memmove_64.S
Просмотреть файл

@ -24,9 +24,7 @@
* Output:
* rax: dest
*/
.weak memmove
SYM_FUNC_START_ALIAS(memmove)
SYM_FUNC_START_WEAK(memmove)
SYM_FUNC_START(__memmove)
mov %rdi, %rax

4
arch/x86/lib/memset_64.S
Просмотреть файл

@ -6,8 +6,6 @@
#include <asm/alternative-asm.h>
#include <asm/export.h>
.weak memset
/*
* ISO C memset - set a memory block to a byte value. This function uses fast
* string to get better performance than the original function. The code is
@ -19,7 +17,7 @@
*
* rax original destination
*/
SYM_FUNC_START_ALIAS(memset)
SYM_FUNC_START_WEAK(memset)
SYM_FUNC_START(__memset)
/*
* Some CPUs support enhanced REP MOVSB/STOSB feature. It is recommended