Hi Andy,
On Tue, Jul 21, 2015 at 12:59:31PM -0700, Andy Lutomirski wrote:
> This tests general modify_ldt behavior (only writes, so far) as
> well as synchronous updates via IPI. It fails on old kernels.
>
> I called this ldt_gdt because I'll add set_thread_area tests to
> it at some point.
Quick feedback : at two places you have this :
> + } else if (errno == ENOSYS) {
> + printf("[OK]\tmodify_ldt is returned -ENOSYS\n");
=> s/is //
Please add stdlib.h to avoid this warning I'm getting on 32-bit :
ldt_gdt.c:286:4: warning: incompatible implicit declaration of built-in
function 'exit' [enabled by default]
And I had to remove xmmintrinsic as suggested by Boris as well.
FWIW here's what I'm getting here on 4.1.2 without CONFIG_X86_16BIT
(where nmi_espfix failed), the output is the same for a 32- and a 64-bit
process :
[OK] LDT entry 0 has AR 0x0040FA00 and limit 0x0000000A
[OK] LDT entry 0 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07A00 and limit 0x0000AFFF
[OK] modify_ldt rejected 16 bit segment
[OK] LDT entry 2 has AR 0x00D07200 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07000 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07400 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00507600 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507E00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507C00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507A00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[RUN] Test fork
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[OK] LDT entry 1 is invalid
[OK] Child succeeded
[OK] modify_ldt failure 22
[OK] modify_ldt rejected 16 bit segment
[OK] modify_ldt rejected 16 bit segment
[OK] modify_ldt rejected 16 bit segment
[OK] modify_ldt rejected 16 bit segment
[OK] modify_ldt rejected 16 bit segment
[OK] modify_ldt rejected 16 bit segment
[OK] LDT entry 0 is invalid
[OK] LDT entry 0 has AR 0x0040F200 and limit 0x00000000
[OK] LDT entry 0 is invalid
[RUN] Cross-CPU LDT invalidation
[FAIL] 5 of 5 iterations failed
Thanks,
Willy
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