From: Tom Lendacky thomas.lendacky@amd.com
[ Upstream commit 5dee19b6b2b194216919b99a1f5af2949a754016 ]
When calculating an end address based on an unsigned int number of pages, any value greater than or equal to 0x100000 that is shift PAGE_SHIFT bits results in a 0 value, resulting in an invalid end address. Change the number of pages variable in various routines from an unsigned int to an unsigned long to calculate the end address correctly.
Fixes: 5e5ccff60a29 ("x86/sev: Add helper for validating pages in early enc attribute changes") Fixes: dc3f3d2474b8 ("x86/mm: Validate memory when changing the C-bit") Signed-off-by: Tom Lendacky thomas.lendacky@amd.com Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Link: https://lore.kernel.org/r/6a6e4eea0e1414402bac747744984fa4e9c01bb6.168606308... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/include/asm/sev.h | 16 ++++++++-------- arch/x86/kernel/sev.c | 14 +++++++------- 2 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 13dc2a9d23c1e..7ca5c9ec8b52e 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -192,12 +192,12 @@ struct snp_guest_request_ioctl;
void setup_ghcb(void); void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, - unsigned int npages); + unsigned long npages); void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, - unsigned int npages); + unsigned long npages); void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op); -void snp_set_memory_shared(unsigned long vaddr, unsigned int npages); -void snp_set_memory_private(unsigned long vaddr, unsigned int npages); +void snp_set_memory_shared(unsigned long vaddr, unsigned long npages); +void snp_set_memory_private(unsigned long vaddr, unsigned long npages); void snp_set_wakeup_secondary_cpu(void); bool snp_init(struct boot_params *bp); void __init __noreturn snp_abort(void); @@ -212,12 +212,12 @@ static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; } static inline void setup_ghcb(void) { } static inline void __init -early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned int npages) { } +early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } static inline void __init -early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned int npages) { } +early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { } static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { } -static inline void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) { } -static inline void snp_set_memory_private(unsigned long vaddr, unsigned int npages) { } +static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { } +static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { } static inline void snp_set_wakeup_secondary_cpu(void) { } static inline bool snp_init(struct boot_params *bp) { return false; } static inline void snp_abort(void) { } diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index b031244d6d2df..108bbae59c35a 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -645,7 +645,7 @@ static u64 __init get_jump_table_addr(void) return ret; }
-static void pvalidate_pages(unsigned long vaddr, unsigned int npages, bool validate) +static void pvalidate_pages(unsigned long vaddr, unsigned long npages, bool validate) { unsigned long vaddr_end; int rc; @@ -662,7 +662,7 @@ static void pvalidate_pages(unsigned long vaddr, unsigned int npages, bool valid } }
-static void __init early_set_pages_state(unsigned long paddr, unsigned int npages, enum psc_op op) +static void __init early_set_pages_state(unsigned long paddr, unsigned long npages, enum psc_op op) { unsigned long paddr_end; u64 val; @@ -701,7 +701,7 @@ static void __init early_set_pages_state(unsigned long paddr, unsigned int npage }
void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, - unsigned int npages) + unsigned long npages) { /* * This can be invoked in early boot while running identity mapped, so @@ -723,7 +723,7 @@ void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long padd }
void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, - unsigned int npages) + unsigned long npages) { /* * This can be invoked in early boot while running identity mapped, so @@ -879,7 +879,7 @@ static void __set_pages_state(struct snp_psc_desc *data, unsigned long vaddr, sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_PSC); }
-static void set_pages_state(unsigned long vaddr, unsigned int npages, int op) +static void set_pages_state(unsigned long vaddr, unsigned long npages, int op) { unsigned long vaddr_end, next_vaddr; struct snp_psc_desc *desc; @@ -904,7 +904,7 @@ static void set_pages_state(unsigned long vaddr, unsigned int npages, int op) kfree(desc); }
-void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) +void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) return; @@ -914,7 +914,7 @@ void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) set_pages_state(vaddr, npages, SNP_PAGE_STATE_SHARED); }
-void snp_set_memory_private(unsigned long vaddr, unsigned int npages) +void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) return;