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riscv/mm: manufacture shadow stack ptes

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This patch implements the creation of a shadow stack pte on
riscv. Creating shadow stack PTE on riscv means clearing RWX and then
setting W=1.

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Tested-by: Andreas Korb <andreas.korb@aisec.fraunhofer.de> # QEMU, custom CVA6
Tested-by: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Link: https://patch.msgid.link/20251112-v5_user_cfi_series-v23-7-b55691eacf4f@rivosinc.com
[pjw@kernel.org: cleaned up patch description]
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Deepak Gupta 2026-01-25 21:09:53 -07:00 committed by Paul Walmsley
parent 6c7559f22b
commit f56ffb8ada
1 changed files with 10 additions and 0 deletions
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10
arch/riscv/include/asm/pgtable.h
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@ -456,6 +456,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte)
return __pte(pte_val(pte) | _PAGE_WRITE);
}
static inline pte_t pte_mkwrite_shstk(pte_t pte)
{
return __pte((pte_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE);
}
/* static inline pte_t pte_mkexec(pte_t pte) */
static inline pte_t pte_mkdirty(pte_t pte)
@ -839,6 +844,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd)));
}
static inline pmd_t pmd_mkwrite_shstk(pmd_t pte)
{
return __pmd((pmd_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE);
}
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
return pte_pmd(pte_wrprotect(pmd_pte(pmd)));