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x86/fred: Correct speculative safety in fred_extint()

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array_index_nospec() is no use if the result gets spilled to the stack, as
it makes the believed safe-under-speculation value subject to memory
predictions.

For all practical purposes, this means array_index_nospec() must be used in
the expression that accesses the array.

As the code currently stands, it's the wrong side of irqentry_enter(), and
'index' is put into %ebp across the function call.

Remove the index variable and reposition array_index_nospec(), so it's
calculated immediately before the array access.

Fixes: 14619d912b ("x86/fred: FRED entry/exit and dispatch code")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260106131504.679932-1-andrew.cooper3@citrix.com
This commit is contained in:
Andrew Cooper 2026-01-06 13:15:04 +00:00 • committed by Peter Zijlstra
parent 6de23f81a5
commit aa280a08e7
1 changed files with 2 additions and 3 deletions
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5
arch/x86/entry/entry_fred.c
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@ -160,8 +160,6 @@ void __init fred_complete_exception_setup(void)
static noinstr void fred_extint(struct pt_regs *regs)
{
unsigned int vector = regs->fred_ss.vector;
unsigned int index = array_index_nospec(vector - FIRST_SYSTEM_VECTOR,
NR_SYSTEM_VECTORS);
if (WARN_ON_ONCE(vector < FIRST_EXTERNAL_VECTOR))
return;
@ -170,7 +168,8 @@ static noinstr void fred_extint(struct pt_regs *regs)
irqentry_state_t state = irqentry_enter(regs);
instrumentation_begin();
sysvec_table[index](regs);
sysvec_table[array_index_nospec(vector - FIRST_SYSTEM_VECTOR,
NR_SYSTEM_VECTORS)](regs);
instrumentation_end();
irqentry_exit(regs, state);
} else {