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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2018-07-09 12:13:36 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-08-02 19:41:37 +0300 |
| commit | 42019fc50dfadb219f9e6ddf4c354f3837057d80 (patch) | |
| tree | 7c2173ccdbd6aec6c1bf37434df28a408f986384 /arch/arm/vfp | |
| parent | c32cd419d6650e42b9cdebb83c672ec945e6bd7e (diff) | |
| download | linux-42019fc50dfadb219f9e6ddf4c354f3837057d80.tar.xz | |
ARM: vfp: use __copy_from_user() when restoring VFP state
__get_user_error() is used as a fast accessor to make copying structure
members in the signal handling path as efficient as possible. However,
with software PAN and the recent Spectre variant 1, the efficiency is
reduced as these are no longer fast accessors.
In the case of software PAN, it has to switch the domain register around
each access, and with Spectre variant 1, it would have to repeat the
access_ok() check for each access.
Use __copy_from_user() rather than __get_user_err() for individual
members when restoring VFP state.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 4c375e11ae95..859d50ea17d3 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -597,13 +597,11 @@ int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp, } /* Sanitise and restore the current VFP state from the provided structures. */ -int vfp_restore_user_hwstate(struct user_vfp __user *ufp, - struct user_vfp_exc __user *ufp_exc) +int vfp_restore_user_hwstate(struct user_vfp *ufp, struct user_vfp_exc *ufp_exc) { struct thread_info *thread = current_thread_info(); struct vfp_hard_struct *hwstate = &thread->vfpstate.hard; unsigned long fpexc; - int err = 0; /* Disable VFP to avoid corrupting the new thread state. */ vfp_flush_hwstate(thread); @@ -612,17 +610,16 @@ int vfp_restore_user_hwstate(struct user_vfp __user *ufp, * Copy the floating point registers. There can be unused * registers see asm/hwcap.h for details. */ - err |= __copy_from_user(&hwstate->fpregs, &ufp->fpregs, - sizeof(hwstate->fpregs)); + memcpy(&hwstate->fpregs, &ufp->fpregs, sizeof(hwstate->fpregs)); /* * Copy the status and control register. */ - __get_user_error(hwstate->fpscr, &ufp->fpscr, err); + hwstate->fpscr = ufp->fpscr; /* * Sanitise and restore the exception registers. */ - __get_user_error(fpexc, &ufp_exc->fpexc, err); + fpexc = ufp_exc->fpexc; /* Ensure the VFP is enabled. */ fpexc |= FPEXC_EN; @@ -631,10 +628,10 @@ int vfp_restore_user_hwstate(struct user_vfp __user *ufp, fpexc &= ~(FPEXC_EX | FPEXC_FP2V); hwstate->fpexc = fpexc; - __get_user_error(hwstate->fpinst, &ufp_exc->fpinst, err); - __get_user_error(hwstate->fpinst2, &ufp_exc->fpinst2, err); + hwstate->fpinst = ufp_exc->fpinst; + hwstate->fpinst2 = ufp_exc->fpinst2; - return err ? -EFAULT : 0; + return 0; } /* |