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Reimplement linux_arch_prctl() as a wrapper around sysarch(2).

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This also adds support for LINUX_ARCH_SET_GS.

Reviewed by:	dchagin
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D9372
This commit is contained in:
Edward Tomasz Napierala 2017-02-20 16:13:40 +00:00
parent 82a4538f31
commit 5a49cd0099
1 changed files with 22 additions and 15 deletions
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37
sys/amd64/linux/linux_machdep.c
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@ -88,6 +88,7 @@ __FBSDID("$FreeBSD$");
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_emul.h>
#include <x86/include/sysarch.h>
int
linux_execve(struct thread *td, struct linux_execve_args *args)
@ -226,28 +227,34 @@ int
linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args)
{
int error;
struct pcb *pcb;
struct sysarch_args bsd_args;
LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr);
error = ENOTSUP;
pcb = td->td_pcb;
switch (args->code) {
case LINUX_ARCH_GET_GS:
error = copyout(&pcb->pcb_gsbase, (unsigned long *)args->addr,
sizeof(args->addr));
break;
case LINUX_ARCH_SET_GS:
if (args->addr >= VM_MAXUSER_ADDRESS)
return(EPERM);
break;
case LINUX_ARCH_GET_FS:
error = copyout(&pcb->pcb_fsbase, (unsigned long *)args->addr,
sizeof(args->addr));
bsd_args.op = AMD64_SET_GSBASE;
bsd_args.parms = (void *)args->addr;
error = sysarch(td, &bsd_args);
if (error == EINVAL)
error = EPERM;
break;
case LINUX_ARCH_SET_FS:
error = linux_set_cloned_tls(td, (void *)args->addr);
bsd_args.op = AMD64_SET_FSBASE;
bsd_args.parms = (void *)args->addr;
error = sysarch(td, &bsd_args);
if (error == EINVAL)
error = EPERM;
break;
case LINUX_ARCH_GET_FS:
bsd_args.op = AMD64_GET_FSBASE;
bsd_args.parms = (void *)args->addr;
error = sysarch(td, &bsd_args);
break;
case LINUX_ARCH_GET_GS:
bsd_args.op = AMD64_GET_GSBASE;
bsd_args.parms = (void *)args->addr;
error = sysarch(td, &bsd_args);
break;
default:
error = EINVAL;