diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-06-18 16:18:24 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-06-22 10:51:23 +0200 |
| commit | 9301982c424a003c0095bf157154a85bf5322bd0 (patch) | |
| tree | f96f40f5010ecdb6218364ddaff74f24b2f0852e /arch | |
| parent | 13311e74253fe64329390df80bed3f07314ddd61 (diff) | |
x86/fpu: Preserve supervisor states in sanitize_restored_user_xstate()
sanitize_restored_user_xstate() preserves the supervisor states only
when the fx_only argument is zero, which allows unprivileged user space
to put supervisor states back into init state.
Preserve them unconditionally.
[ bp: Fix a typo or two in the text. ]
Fixes: 5d6b6a6f9b5c ("x86/fpu/xstate: Update sanitize_restored_xstate() for supervisor xstates")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210618143444.438635017@linutronix.de
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/fpu/signal.c | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index ec3ae3054792..b7b92cdf3add 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -221,28 +221,18 @@ sanitize_restored_user_xstate(union fpregs_state *state, if (use_xsave()) { /* - * Note: we don't need to zero the reserved bits in the - * xstate_header here because we either didn't copy them at all, - * or we checked earlier that they aren't set. + * Clear all feature bits which are not set in + * user_xfeatures and clear all extended features + * for fx_only mode. */ + u64 mask = fx_only ? XFEATURE_MASK_FPSSE : user_xfeatures; /* - * 'user_xfeatures' might have bits clear which are - * set in header->xfeatures. This represents features that - * were in init state prior to a signal delivery, and need - * to be reset back to the init state. Clear any user - * feature bits which are set in the kernel buffer to get - * them back to the init state. - * - * Supervisor state is unchanged by input from userspace. - * Ensure supervisor state bits stay set and supervisor - * state is not modified. + * Supervisor state has to be preserved. The sigframe + * restore can only modify user features, i.e. @mask + * cannot contain them. */ - if (fx_only) - header->xfeatures = XFEATURE_MASK_FPSSE; - else - header->xfeatures &= user_xfeatures | - xfeatures_mask_supervisor(); + header->xfeatures &= mask | xfeatures_mask_supervisor(); } if (use_fxsr()) { |