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x86: Mark the trapframe as initialized in ipi_bitmap_handler()

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Otherwise KASAN may generate false positives if the trapframe was
written into a poisoned region of the stack.

Reported by:	pho
Reported by:	syzbot+ee60455cd58e6eed20c9@syzkaller.appspotmail.com
Reported by:	syzbot+be5f9df26426ace3a00c@syzkaller.appspotmail.com
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-07-09 20:38:18 -04:00
parent 5d243d41b1
commit 36226163fa
1 changed files with 3 additions and 0 deletions
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3
sys/x86/x86/mp_x86.c
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@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/asan.h>
#include <sys/bus.h>
#include <sys/cons.h> /* cngetc() */
#include <sys/cpuset.h>
@ -1279,6 +1280,8 @@ ipi_bitmap_handler(struct trapframe frame)
int cpu = PCPU_GET(cpuid);
u_int ipi_bitmap;
kasan_mark(&frame, sizeof(frame), sizeof(frame), 0);
td = curthread;
ipi_bitmap = atomic_readandclear_int(&cpuid_to_pcpu[cpu]->
pc_ipi_bitmap);