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x86/compel/fault-inject: bound xsave features set

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Since
e2e8be37 ("x86/compel/fault-inject: Add a fault-injection for corrupting extended regset")
we doing fault-injection test for C/R of threads register set by filling tasks
xsave structures with the garbage. But there are some features for which that's not
safe. It leads to failures like described in #1635

In this particular case we meet the problem with PKRU feature, the problem
that after corrupting pkru registers we may restrict access to some vma areas,
so, after that process with the parasite injected get's segfault and crashes.

Let's manually specify which features is save to fill with the garbage by
keeping proper XFEATURE_MASK_FAULTINJ mask value.

Fixes: e2e8be37 ("x86/compel/fault-inject: Add a fault-injection for corrupting extended regset")

https://github.com/checkpoint-restore/criu/issues/1635

Signed-off-by: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
This commit is contained in:
Alexander Mikhalitsyn 2021-12-13 15:19:50 +03:00 committed by Andrei Vagin
parent 6186bfa0c7
commit fc1eb01ff3
2 changed files with 6 additions and 0 deletions
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5
compel/arch/x86/src/lib/include/uapi/asm/fpu.h
View File

@ -80,6 +80,11 @@ enum xfeature {
(XFEATURE_MASK_FP | XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_OPMASK | XFEATURE_MASK_ZMM_Hi256 | \
XFEATURE_MASK_Hi16_ZMM | XFEATURE_MASK_PKRU | XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR)
/* xsave structure features which is safe to fill with garbage (see validate_random_xstate()) */
#define XFEATURE_MASK_FAULTINJ \
(XFEATURE_MASK_FP | XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_OPMASK | XFEATURE_MASK_ZMM_Hi256 | \
XFEATURE_MASK_Hi16_ZMM)
struct fpx_sw_bytes {
uint32_t magic1;
uint32_t extended_size;

1
compel/arch/x86/src/lib/infect.c
View File

@ -254,6 +254,7 @@ static void validate_random_xstate(struct xsave_struct *xsave)
/* No unknown or supervisor features may be set */
hdr->xstate_bv &= XFEATURE_MASK_USER;
hdr->xstate_bv &= ~XFEATURE_MASK_SUPERVISOR;
hdr->xstate_bv &= XFEATURE_MASK_FAULTINJ;
for (i = 0; i < XFEATURE_MAX; i++) {
if (!compel_fpu_has_feature(i))