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authorAndy Lutomirski <luto@kernel.org>2015-07-30 23:31:34 +0200
committerIngo Molnar <mingo@kernel.org>2015-07-31 13:30:45 +0200
commita5b9e5a2f14f25a8dae987494d50ad3aac7366b6 (patch)
tree40b3ab61f67d5c4df17e25dea053f3a9aeb6934d /kernel/sys_ni.c
parentselftests/x86, x86/ldt: Add a selftest for modify_ldt() (diff)
downloadlinux-a5b9e5a2f14f25a8dae987494d50ad3aac7366b6.tar.xz
linux-a5b9e5a2f14f25a8dae987494d50ad3aac7366b6.zip
x86/ldt: Make modify_ldt() optional
The modify_ldt syscall exposes a large attack surface and is unnecessary for modern userspace. Make it optional. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jan Beulich <jbeulich@suse.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: security@kernel.org <security@kernel.org> Cc: xen-devel <xen-devel@lists.xen.org> Link: http://lkml.kernel.org/r/a605166a771c343fd64802dece77a903507333bd.1438291540.git.luto@kernel.org [ Made MATH_EMULATION dependent on MODIFY_LDT_SYSCALL. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sys_ni.c')
-rw-r--r--kernel/sys_ni.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 7995ef5868d8..ca7d84f438f1 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -140,6 +140,7 @@ cond_syscall(sys_sgetmask);
cond_syscall(sys_ssetmask);
cond_syscall(sys_vm86old);
cond_syscall(sys_vm86);
+cond_syscall(sys_modify_ldt);
cond_syscall(sys_ipc);
cond_syscall(compat_sys_ipc);
cond_syscall(compat_sys_sysctl);