linux-hardening - [RESEND PATCH v4 07/11] powerpc/64s: Make slb_allocate

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Message-Id: <20210506043452.9674-8-cmr@linux.ibm.com>
Date:   Wed,  5 May 2021 23:34:48 -0500
From:   "Christopher M. Riedl" <cmr@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     tglx@...utronix.de, x86@...nel.org,
        linux-hardening@...r.kernel.org, keescook@...omium.org
Subject: [RESEND PATCH v4 07/11] powerpc/64s: Make slb_allocate_user() non-static

With Book3s64 Hash translation, manually inserting a PTE requires
updating the Linux PTE, inserting a SLB entry, and inserting the hashed
page. The first is handled via the usual kernel abstractions, the second
requires slb_allocate_user() which is currently 'static', and the third
is available via hash_page_mm() already.

Make slb_allocate_user() non-static and add a prototype so the next
patch can use it during code-patching.

Signed-off-by: Christopher M. Riedl <cmr@...ux.ibm.com>

---

v4:  * New to series.
---
 arch/powerpc/include/asm/book3s/64/mmu-hash.h | 1 +
 arch/powerpc/mm/book3s64/slb.c                | 4 +---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index 3004f3323144d..189854eebba77 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -525,6 +525,7 @@ void slb_dump_contents(struct slb_entry *slb_ptr);
 extern void slb_vmalloc_update(void);
 extern void slb_set_size(u16 size);
 void preload_new_slb_context(unsigned long start, unsigned long sp);
+long slb_allocate_user(struct mm_struct *mm, unsigned long ea);
 #endif /* __ASSEMBLY__ */
 
 /*
diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c
index da0836cb855af..532eb51bc5211 100644
--- a/arch/powerpc/mm/book3s64/slb.c
+++ b/arch/powerpc/mm/book3s64/slb.c
@@ -29,8 +29,6 @@
 #include "internal.h"
 
 
-static long slb_allocate_user(struct mm_struct *mm, unsigned long ea);
-
 bool stress_slb_enabled __initdata;
 
 static int __init parse_stress_slb(char *p)
@@ -791,7 +789,7 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
 	return slb_insert_entry(ea, context, flags, ssize, true);
 }
 
-static long slb_allocate_user(struct mm_struct *mm, unsigned long ea)
+long slb_allocate_user(struct mm_struct *mm, unsigned long ea)
 {
 	unsigned long context;
 	unsigned long flags;
-- 
2.26.1