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arm64 fixes for 5.0

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- Fix handling of PSTATE.SSBS bit in sigreturn()
 
 - Fix version checking of the GIC during early boot
 
 - Fix clang builds failing due to use of NEON in the crypto code
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull late arm64 fixes from Will Deacon:
 "Three small arm64 fixes for 5.0.

  They fix a build breakage with clang introduced in 4.20, an oversight
  in our sigframe restoration relating to the SSBS bit and a boot fix
  for systems with newer revisions of our interrupt controller.

  Summary:

   - Fix handling of PSTATE.SSBS bit in sigreturn()

   - Fix version checking of the GIC during early boot

   - Fix clang builds failing due to use of NEON in the crypto code"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Relax GIC version check during early boot
  arm64/neon: Disable -Wincompatible-pointer-types when building with Clang
  arm64: fix SSBS sanitization
This commit is contained in:
Linus Torvalds 2019-02-21 09:11:36 -08:00
commit d6622d913a
3 changed files with 13 additions and 9 deletions
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4
arch/arm64/include/asm/neon-intrinsics.h
View File

@ -36,4 +36,8 @@
#include <arm_neon.h>
#endif
#ifdef CONFIG_CC_IS_CLANG
#pragma clang diagnostic ignored "-Wincompatible-pointer-types"
#endif
#endif /* __ASM_NEON_INTRINSICS_H */

3
arch/arm64/kernel/head.S
View File

@ -539,8 +539,7 @@ set_hcr:
/* GICv3 system register access */
mrs x0, id_aa64pfr0_el1
ubfx x0, x0, #24, #4
cmp x0, #1
b.ne 3f
cbz x0, 3f
mrs_s x0, SYS_ICC_SRE_EL2
orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1

15
arch/arm64/kernel/ptrace.c
View File

@ -1702,19 +1702,20 @@ void syscall_trace_exit(struct pt_regs *regs)
}
/*
* SPSR_ELx bits which are always architecturally RES0 per ARM DDI 0487C.a
* We also take into account DIT (bit 24), which is not yet documented, and
* treat PAN and UAO as RES0 bits, as they are meaningless at EL0, and may be
* allocated an EL0 meaning in future.
* SPSR_ELx bits which are always architecturally RES0 per ARM DDI 0487D.a.
* We permit userspace to set SSBS (AArch64 bit 12, AArch32 bit 23) which is
* not described in ARM DDI 0487D.a.
* We treat PAN and UAO as RES0 bits, as they are meaningless at EL0, and may
* be allocated an EL0 meaning in future.
* Userspace cannot use these until they have an architectural meaning.
* Note that this follows the SPSR_ELx format, not the AArch32 PSR format.
* We also reserve IL for the kernel; SS is handled dynamically.
*/
#define SPSR_EL1_AARCH64_RES0_BITS \
(GENMASK_ULL(63,32) | GENMASK_ULL(27, 25) | GENMASK_ULL(23, 22) | \
GENMASK_ULL(20, 10) | GENMASK_ULL(5, 5))
(GENMASK_ULL(63, 32) | GENMASK_ULL(27, 25) | GENMASK_ULL(23, 22) | \
GENMASK_ULL(20, 13) | GENMASK_ULL(11, 10) | GENMASK_ULL(5, 5))
#define SPSR_EL1_AARCH32_RES0_BITS \
(GENMASK_ULL(63,32) | GENMASK_ULL(23, 22) | GENMASK_ULL(20,20))
(GENMASK_ULL(63, 32) | GENMASK_ULL(22, 22) | GENMASK_ULL(20, 20))
static int valid_compat_regs(struct user_pt_regs *regs)
{