Messages in this thread |  | | From | Systemkennung Linux <> | Subject | Re: "Exception at ..." with 2.1.9 and 2.1.10 kernels | Date | Mon, 18 Nov 1996 00:53:36 +0100 (MET) |
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> Sorry, I'm still not buying that. Getname comes from linux/fs/namei.c. In > the code, it says that it is copying from user-space to kernel-space for > "efficiency." Exactly how is this a user problem? User code doesn't know > about kernel space.
But the kernel knows about userspace.
> I still say something's goofy.
Goofy lusercode. For example look into sys_open, the open(2) syscall and look what would happen if you pass bad parameters, for example a NULL pointer: the kernel passes this pointer to getname().
Or even easier, write a program that passes a NULL pointer to open(2)/read(2)/write(2) etc. What happens? You get one of these nice messages.
Btw, some days ago someone posted a long and quite good article about this topic which describes in detail how the new way to access user space works.
Ralf
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