Revision f2d7b53c0153f2daa8bc8f1ff29b5a1e03a36458 authored by Alexander Potapenko on 02 November 2022, 10:15:00 UTC, committed by Alexander Potapenko on 02 November 2022, 10:55:06 UTC
There is a case in exc_invalid_op handler that is executed outside the irqentry_enter()/irqentry_exit() region when an UD2 instruction is used to encode a call to __warn(). In that case the `struct pt_regs` passed to the interrupt handler is never unpoisoned by KMSAN (this is normally done in irqentry_enter()), which leads to false positives inside handle_bug(). Use kmsan_unpoison_entry_regs() to explicitly unpoison those registers before using them. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org Signed-off-by: Alexander Potapenko <glider@google.com>
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memregion.c
// SPDX-License-Identifier: GPL-2.0-only
/* identifiers for device / performance-differentiated memory regions */
#include <linux/idr.h>
#include <linux/types.h>
#include <linux/memregion.h>
static DEFINE_IDA(memregion_ids);
int memregion_alloc(gfp_t gfp)
{
return ida_alloc(&memregion_ids, gfp);
}
EXPORT_SYMBOL(memregion_alloc);
void memregion_free(int id)
{
ida_free(&memregion_ids, id);
}
EXPORT_SYMBOL(memregion_free);
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