http://bugs.freedesktop.org/show_bug.cgi?id=17191
Summary: libdrm has sign-extension bug in drmIoctl
Product: DRI
Version: XOrg CVS
Platform: x86-64 (AMD64)
OS/Version: FreeBSD
Status: NEW
Severity: normal
Priority: medium
Component: libdrm
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
Created an attachment (id=18361)
--> (http://bugs.freedesktop.org/attachment.cgi?id=18361)
Patch to libdrm to fix the problem on FreeBSD/amd64
FreeBSD amd64 reports a sign-extension on the ioctl calls which pass through
drmIoctl in xf86drm.c. The problem is that the request is typed as "int" (a
signed, 32-bit type), while the ioctl system call expects this to be an
"unsigned long" (an unsigned, 64-bit type). As it first performs the signed
conversion, then the field extension, any ioctl's with the high-bit set will
have all high 32-bits set in the ioctl passed to the driver. The drm driver is
only looking for unsigned long ioctl requests, so none of these high ioctls
will succeed. This eventually leads to a hang in the X-server on my system.
For instance: ioctl request 0xc0001432 becomes 0xffffffffc0001432, but the drm
driver is looking for 0x00000000c0001432, so the subsequent ioctls never
succeed.
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