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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2023-09-25 21:31:35 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-19 09:12:45 +0300 |
| commit | d3c0dfcfc95796701e82719722fd997ec5256013 (patch) | |
| tree | 86b23ccd5a075378f167af49c62d0bb570e2b0bc | |
| parent | 4c8dd6c9872d4e89fd2b3a6fc92fd6cc9cdce347 (diff) | |
| download | linux-d3c0dfcfc95796701e82719722fd997ec5256013.tar.xz | |
powerpc: Implement and use pgprot_nx()
ioremap_page_range() calls pgprot_nx() vmap() and vmap_pfn()
clear execute permission by calling pgprot_nx().
When pgprot_nx() is not defined it falls back to a nop.
Implement it for powerpc then use it in early_ioremap_range().
Then the call to pte_exprotect() can be removed from ioremap_prot().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/5993a7a097e989af1c97fc4a6c011fefc67dbe6e.1695659959.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/include/asm/pgtable.h | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/ioremap.c | 5 |
2 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 966e7c5119f6..2bfb7dd3b49e 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -71,6 +71,12 @@ static inline pgprot_t pte_pgprot(pte_t pte) return __pgprot(pte_flags); } +static inline pgprot_t pgprot_nx(pgprot_t prot) +{ + return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot)))); +} +#define pgprot_nx pgprot_nx + #ifndef pmd_page_vaddr static inline const void *pmd_page_vaddr(pmd_t pmd) { diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c index 705e8e8ffde4..d5159f205380 100644 --- a/arch/powerpc/mm/ioremap.c +++ b/arch/powerpc/mm/ioremap.c @@ -50,8 +50,7 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long flags) if (pte_write(pte)) pte = pte_mkdirty(pte); - /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ - pte = pte_exprotect(pte); + /* we don't want to let _PAGE_USER leak out */ pte = pte_mkprivileged(pte); if (iowa_is_active()) @@ -66,7 +65,7 @@ int early_ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long i; for (i = 0; i < size; i += PAGE_SIZE) { - int err = map_kernel_page(ea + i, pa + i, prot); + int err = map_kernel_page(ea + i, pa + i, pgprot_nx(prot)); if (WARN_ON_ONCE(err)) /* Should clean up */ return err; |