Path passed to ffs_mount() is garbage?
Simon 'corecode' Schubert
corecode at fs.ei.tum.de
Thu Mar 22 04:30:51 PDT 2007
Matthew Dillon wrote:
:So I take my first foray into the dragonfly kernel and do this to
:ffs_mount() in /usr/src/sys/vfs/ufs/ffs_vfsops.c: I merely add a
: kprintf("ffs_mount to %s\n",((path == NULL) ? "(NULL)" : path));
:as the very first line of code (past the declarations of course).
:When I test this by starting up my vkernel, if path is non-null, it
:points to garbage data.
:I'm probably being naive here, what am I missing?
path is passed from userland. Its a userland pointer. It shouldn't
be garbage, but you probably need to do a copyin() into a kernel
buffer instead of printing it directly. Actually, I'm a little at
a loss because on the PC architecture the pointer should still be
printable (if a bit dangerous due to being a userland address).
yah, but not for vkernels... the vmspace is different :/ makes it also a bitch to debug
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