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- Fix the vDSO exception handling return path to disable interrupts

Browse Source 
again.
 
 - A fix for the CE collector to return the proper return values to its
 callers which are used to convey what the collector has done with the
 error address.
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Merge tag 'x86_urgent_for_v5.12-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Fix the vDSO exception handling return path to disable interrupts
   again.

 - A fix for the CE collector to return the proper return values to its
   callers which are used to convey what the collector has done with the
   error address.

* tag 'x86_urgent_for_v5.12-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/traps: Correct exc_general_protection() and math_error() return paths
  RAS/CEC: Correct ce_add_elem()'s returned values
This commit is contained in:
Linus Torvalds 2021-04-11 11:42:18 -07:00
commit 06f838e02d
2 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/traps.c
View File

@ -556,7 +556,7 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
tsk->thread.trap_nr = X86_TRAP_GP;
if (fixup_vdso_exception(regs, X86_TRAP_GP, error_code, 0))
return;
goto exit;
show_signal(tsk, SIGSEGV, "", desc, regs, error_code);
force_sig(SIGSEGV);
@ -1057,7 +1057,7 @@ static void math_error(struct pt_regs *regs, int trapnr)
goto exit;
if (fixup_vdso_exception(regs, trapnr, 0, 0))
return;
goto exit;
force_sig_fault(SIGFPE, si_code,
(void __user *)uprobe_get_trap_addr(regs));

15
drivers/ras/cec.c
View File

@ -309,11 +309,20 @@ static bool sanity_check(struct ce_array *ca)
return ret;
}
/**
* cec_add_elem - Add an element to the CEC array.
* @pfn: page frame number to insert
*
* Return values:
* - <0: on error
* - 0: on success
* - >0: when the inserted pfn was offlined
*/
static int cec_add_elem(u64 pfn)
{
struct ce_array *ca = &ce_arr;
int count, err, ret = 0;
unsigned int to = 0;
int count, ret = 0;
/*
* We can be called very early on the identify_cpu() path where we are
@ -330,8 +339,8 @@ static int cec_add_elem(u64 pfn)
if (ca->n == MAX_ELEMS)
WARN_ON(!del_lru_elem_unlocked(ca));
ret = find_elem(ca, pfn, &to);
if (ret < 0) {
err = find_elem(ca, pfn, &to);
if (err < 0) {
/*
* Shift range [to-end] to make room for one more element.
*/