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MFC:

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New sysctl: "hw.snd.compat_linux_mmap" to allow PROT_EXEC page
mapping, due to recent changes in linux compatibility layer which
require it. All linux applications that using sound + mmap() (mostly games)
require this to be enabled. Disabled by default.
This commit is contained in:
ariff 2007-07-08 14:01:11 +00:00
parent 70891f8aea
commit 47c22847e2
1 changed files with 13 additions and 1 deletions
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14
sys/dev/sound/pcm/dsp.c
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@ -31,6 +31,10 @@
SND_DECLARE_FILE("$FreeBSD$");
static int dsp_mmap_allow_prot_exec = 0;
SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
&dsp_mmap_allow_prot_exec, 0, "linux mmap compatibility");
#define OLDPCM_IOCTL
static d_open_t dsp_open;
@ -1080,7 +1084,15 @@ dsp_mmap(struct cdev *i_dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
{
struct pcm_channel *wrch = NULL, *rdch = NULL, *c;
if (nprot & PROT_EXEC)
/*
* Reject PROT_EXEC by default. It just doesn't makes sense.
* Unfortunately, we have to give up this one due to linux_mmap
* changes.
*
* http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
*
*/
if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec == 0)
return -1;
getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);