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linux/arch/x86/include/uapi/asm
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Andy Lutomirski e990e54996 x86/tls: Don't validate lm in set_thread_area() after all 
commit 3fb2f4237b upstream.

It turns out that there's a lurking ABI issue.  GCC, when
compiling this in a 32-bit program:

struct user_desc desc = {
	.entry_number    = idx,
	.base_addr       = base,
	.limit           = 0xfffff,
	.seg_32bit       = 1,
	.contents        = 0, /* Data, grow-up */
	.read_exec_only  = 0,
	.limit_in_pages  = 1,
	.seg_not_present = 0,
	.useable         = 0,
};

will leave .lm uninitialized.  This means that anything in the
kernel that reads user_desc.lm for 32-bit tasks is unreliable.

Revert the .lm check in set_thread_area().  The value never did
anything in the first place.

Fixes: 0e58af4e1d ("x86/tls: Disallow unusual TLS segments")
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/d7875b60e28c512f6a6fc0baf5714d58e7eaadbb.1418856405.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-01-08 10:00:49 -08:00
..
Kbuild UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
a.out.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
auxvec.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
bitsperlong.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
boot.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
bootparam.h x86: Add xloadflags bit for EFI runtime support on kexec 2013-12-29 13:09:06 +00:00
byteorder.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
debugreg.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
e820.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
errno.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
fcntl.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
hw_breakpoint.h create non-empty arch/x86/include/uapi/asm/ files 2012-12-17 17:15:11 -08:00
hyperv.h add support for Hyper-V reference time counter 2014-01-17 10:22:08 +01:00
ioctl.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
ioctls.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
ipcbuf.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
ist.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
kvm.h kvm: Add KVM_GET_EMULATED_CPUID 2013-10-30 18:54:39 +01:00
kvm_para.h kvm uapi: Add KICK_CPU and PV_UNHALT definition to uapi 2013-08-26 12:46:01 +03:00
ldt.h x86/tls: Don't validate lm in set_thread_area() after all 2015-01-08 10:00:49 -08:00
mce.h x86, MCE: Retract most UAPI exports 2013-01-09 14:49:02 +01:00
mman.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
msgbuf.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
msr-index.h First round of KVM updates for 3.14; PPC parts will come next week. 2014-01-22 21:40:43 -08:00
msr.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
mtrr.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
param.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
perf_regs.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
poll.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
posix_types.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
posix_types_32.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
posix_types_64.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
posix_types_x32.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
prctl.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
processor-flags.h x86, processor-flags: Fix the datatypes and add bit number defines 2013-06-25 16:26:06 -07:00
ptrace-abi.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
ptrace.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
resource.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
sembuf.h x86, uapi, x32: Use __kernel_ulong_t in x86 struct semid64_ds 2014-01-20 14:45:13 -08:00
setup.h create non-empty arch/x86/include/uapi/asm/ files 2012-12-17 17:15:11 -08:00
shmbuf.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
sigcontext.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
sigcontext32.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
siginfo.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
signal.h consolidate kernel-side struct sigaction declarations 2013-02-03 15:09:22 -05:00
socket.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
sockios.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
stat.h x86, x32: Use __kernel_long_t/__kernel_ulong_t in x86-64 stat.h 2013-12-20 16:04:35 -08:00
statfs.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
svm.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
swab.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
termbits.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
termios.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
types.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
ucontext.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
unistd.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
vm86.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
vmx.h kvm: vmx: handle invvpid vm exit gracefully 2014-11-14 08:59:55 -08:00
vsyscall.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00