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devarch: restrict i/o port access to 64K, disallow msr 32-bit wrap arround (thanks aiju)

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This commit is contained in:
cinap_lenrek 2018-09-09 01:41:35 +02:00
parent 4f2cdcf74b
commit ba7b07d51a
1 changed files with 9 additions and 2 deletions
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11
sys/src/9/pc/devarch.c
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@ -309,8 +309,11 @@ iounused(int start, int end)
}
static void
checkport(int start, int end)
checkport(uint start, uint end)
{
if(end < start || end > 0x10000)
error(Ebadarg);
/* standard vga regs are OK */
if(start >= 0x2b0 && end <= 0x2df+1)
return;
@ -356,12 +359,12 @@ archread(Chan *c, void *a, long n, vlong offset)
{
char buf[32], *p;
uint port, end;
int i;
ushort *sp;
ulong *lp;
vlong *vp;
IOMap *m;
Rdwrfn *fn;
int i;
port = offset;
end = port+n;
@ -394,6 +397,8 @@ archread(Chan *c, void *a, long n, vlong offset)
case Qmsr:
if(n & 7)
error(Ebadarg);
if((uint)n/8 > -port)
error(Ebadarg);
end = port+(n/8);
for(vp = a; port < end; port++)
if(rdmsr(port, vp++) < 0)
@ -465,6 +470,8 @@ archwrite(Chan *c, void *a, long n, vlong offset)
case Qmsr:
if(n & 7)
error(Ebadarg);
if((uint)n/8 > -port)
error(Ebadarg);
end = port+(n/8);
for(vp = a; port < end; port++)
if(wrmsr(port, *vp++) < 0)