From: Andrew Cooper andrew.cooper3@citrix.com
stable inclusion from linux-4.19.223 commit 94cc1e8331973ee7a2b4336f7ba67f48c2877d0a
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commit 57690554abe135fee81d6ac33cc94d75a7e224bb upstream.
Both __pkru_allows_write() and arch_set_user_pkey_access() shift PKRU_WD_BIT (a signed constant) by up to 30 bits, hitting the sign bit.
Use unsigned constants instead.
Clearly pkey 15 has not been used in combination with UBSAN yet.
Noticed by code inspection only. I can't actually provoke the compiler into generating incorrect logic as far as this shift is concerned.
[ dhansen: add stable@ tag, plus minor changelog massaging,
For anyone doing backports, these #defines were in arch/x86/include/asm/pgtable.h before 784a46618f6. ]
Fixes: 33a709b25a76 ("mm/gup, x86/mm/pkeys: Check VMAs and PTEs for protection keys") Signed-off-by: Andrew Cooper andrew.cooper3@citrix.com Signed-off-by: Dave Hansen dave.hansen@linux.intel.com Signed-off-by: Borislav Petkov bp@suse.de Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20211216000856.4480-1-andrew.cooper3@citrix.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- arch/x86/include/asm/pgtable.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index fe6f9e7f15bb..1d79485ae972 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1353,8 +1353,8 @@ static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) #endif #endif
-#define PKRU_AD_BIT 0x1 -#define PKRU_WD_BIT 0x2 +#define PKRU_AD_BIT 0x1u +#define PKRU_WD_BIT 0x2u #define PKRU_BITS_PER_PKEY 2
static inline bool __pkru_allows_read(u32 pkru, u16 pkey)