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powerpc: Fail ioremap() instead of silently ignoring flags when PAGE_USER is set

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Calling ioremap() with _PAGE_USER (or _PAGE_PRIVILEDGE unset)
is wrong. Loudly fail the call to ioremap() instead of blindly
clearing the flags.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/b6dd5485ad00d2aafd2bb9b7c2c4eac3ebf2cdaf.1695659959.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2023-09-25 20:31:36 +02:00
committed by Michael Ellerman
parent d3c0dfcfc9
commit c7263f1563
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/mm/ioremap.c
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@@ -51,7 +51,8 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long flags)
pte = pte_mkdirty(pte);
/* we don't want to let _PAGE_USER leak out */
pte = pte_mkprivileged(pte);
if (WARN_ON(pte_user(pte)))
return NULL;
if (iowa_is_active())
return iowa_ioremap(addr, size, pte_pgprot(pte), caller);