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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2023-09-25 21:31:36 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-19 09:12:46 +0300 |
| commit | c7263f156395d1f2a2142375a75b7b040686a07a (patch) | |
| tree | 40bdaa55b2bd059df777f60e37b6884d7f6ea653 /arch/powerpc/mm | |
| parent | d3c0dfcfc95796701e82719722fd997ec5256013 (diff) | |
| download | linux-c7263f156395d1f2a2142375a75b7b040686a07a.tar.xz | |
powerpc: Fail ioremap() instead of silently ignoring flags when PAGE_USER is set
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
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/ioremap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c index d5159f205380..7823c38f09de 100644 --- a/arch/powerpc/mm/ioremap.c +++ b/arch/powerpc/mm/ioremap.c @@ -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); |