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Misc fixes: a kerneldoc build warning fix, add SRSO mitigation for

Browse source 
AMD-derived Hygon processors, and fix a SGX kernel crash in the
 page fault handler that can trigger when ksgxd races to reclaim
 the SECS special page, by making the SECS page unswappable.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a kerneldoc build warning fix, add SRSO mitigation for
  AMD-derived Hygon processors, and fix a SGX kernel crash in the page
  fault handler that can trigger when ksgxd races to reclaim the SECS
  special page, by making the SECS page unswappable"

* tag 'x86-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race
  x86/srso: Add SRSO mitigation for Hygon processors
  x86/kgdb: Fix a kerneldoc warning when build with W=1
This commit is contained in:
Linus Torvalds 2023-10-01 09:50:58 -07:00
parent 373ceff28e c6c2adcba5
commit ec8c298121
3 changed files with 26 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/kernel/cpu/common.c
View file

@ -1303,7 +1303,7 @@ static const struct x86_cpu_id cpu_vuln_blacklist[] __initconst = {
VULNBL_AMD(0x15, RETBLEED),
VULNBL_AMD(0x16, RETBLEED),
VULNBL_AMD(0x17, RETBLEED | SMT_RSB | SRSO),
VULNBL_HYGON(0x18, RETBLEED | SMT_RSB),
VULNBL_HYGON(0x18, RETBLEED | SMT_RSB | SRSO),
VULNBL_AMD(0x19, SRSO),
{}
};

30
arch/x86/kernel/cpu/sgx/encl.c
View file

@ -235,6 +235,21 @@ static struct sgx_epc_page *sgx_encl_eldu(struct sgx_encl_page *encl_page,
return epc_page;
}
/*
* Ensure the SECS page is not swapped out. Must be called with encl->lock
* to protect the enclave states including SECS and ensure the SECS page is
* not swapped out again while being used.
*/
static struct sgx_epc_page *sgx_encl_load_secs(struct sgx_encl *encl)
{
struct sgx_epc_page *epc_page = encl->secs.epc_page;
if (!epc_page)
epc_page = sgx_encl_eldu(&encl->secs, NULL);
return epc_page;
}
static struct sgx_encl_page *__sgx_encl_load_page(struct sgx_encl *encl,
struct sgx_encl_page *entry)
{
@ -248,11 +263,9 @@ static struct sgx_encl_page *__sgx_encl_load_page(struct sgx_encl *encl,
return entry;
}
if (!(encl->secs.epc_page)) {
epc_page = sgx_encl_eldu(&encl->secs, NULL);
if (IS_ERR(epc_page))
return ERR_CAST(epc_page);
}
epc_page = sgx_encl_load_secs(encl);
if (IS_ERR(epc_page))
return ERR_CAST(epc_page);
epc_page = sgx_encl_eldu(entry, encl->secs.epc_page);
if (IS_ERR(epc_page))
@ -339,6 +352,13 @@ static vm_fault_t sgx_encl_eaug_page(struct vm_area_struct *vma,
mutex_lock(&encl->lock);
epc_page = sgx_encl_load_secs(encl);
if (IS_ERR(epc_page)) {
if (PTR_ERR(epc_page) == -EBUSY)
vmret = VM_FAULT_NOPAGE;
goto err_out_unlock;
}
epc_page = sgx_alloc_epc_page(encl_page, false);
if (IS_ERR(epc_page)) {
if (PTR_ERR(epc_page) == -EBUSY)

1
arch/x86/kernel/kgdb.c
View file

@ -695,7 +695,6 @@ void kgdb_arch_exit(void)
}
/**
*
* kgdb_skipexception - Bail out of KGDB when we've been triggered.
* @exception: Exception vector number
* @regs: Current &struct pt_regs.