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Fix mach64 driver crash

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Due to lack of iopl(3), mach64 driver crashes when ior(BUS_CNTL) is
called. Since BUS_CNTL is out of the range 0x0000-0x03ff, ioperm(0,
1024, 1) is not sufficient and the ior() causes access violation.
This patch reintroduce iopl(3) call in the function hwEnableIO().

Addresses: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1110521
Fixes: a0f738a673 ("Fixed ioperm calls in hwEnableIO")
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2052>
This commit is contained in:
Takashi Yano 2025-08-09 20:22:56 +09:00 • committed by Marge Bot
parent ed92eae84d
commit 3b39aebf98
1 changed files with 2 additions and 2 deletions
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4
hw/xfree86/os-support/linux/lnx_video.c
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@ -123,8 +123,8 @@ hwEnableIO(void)
char *buf=NULL, target[5];
FILE *fp;
if (ioperm(0, 1024, 1)) {
ErrorF("xf86EnableIO: failed to enable I/O ports 0000-03ff (%s)\n",
if (ioperm(0, 1024, 1) || iopl(3)) {
ErrorF("xf86EnableIO: failed to enable I/O ports access (%s)\n",
strerror(errno));
return FALSE;
}