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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-04-03 07:20:53 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-01 12:37:15 +1000 |
| commit | 4fe5cda9f89d0aea8e915b7c96ae34bda4e12e51 (patch) | |
| tree | e727d7a8db04f52ecb7d9f0ca6e372520867d26d /arch/powerpc/include/asm/book3s/32 | |
| parent | 1f59cc3482c645c956a06e1b587e49df8d42ebab (diff) | |
| download | linux-stable-4fe5cda9f89d0aea8e915b7c96ae34bda4e12e51.tar.gz linux-stable-4fe5cda9f89d0aea8e915b7c96ae34bda4e12e51.tar.bz2 linux-stable-4fe5cda9f89d0aea8e915b7c96ae34bda4e12e51.zip | |
powerpc/uaccess: Implement user_read_access_begin and user_write_access_begin
Add support for selective read or write user access with
user_read_access_begin/end and user_write_access_begin/end.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6c83af0f0809ef2a955c39ac622767f6cbede035.1585898438.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm/book3s/32')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/32/kup.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h index 3c0ba22dc360..1617e73bee30 100644 --- a/arch/powerpc/include/asm/book3s/32/kup.h +++ b/arch/powerpc/include/asm/book3s/32/kup.h @@ -108,7 +108,7 @@ static __always_inline void allow_user_access(void __user *to, const void __user u32 addr, end; BUILD_BUG_ON(!__builtin_constant_p(dir)); - BUILD_BUG_ON(dir == KUAP_CURRENT); + BUILD_BUG_ON(dir & ~KUAP_READ_WRITE); if (!(dir & KUAP_WRITE)) return; @@ -131,7 +131,7 @@ static __always_inline void prevent_user_access(void __user *to, const void __us BUILD_BUG_ON(!__builtin_constant_p(dir)); - if (dir == KUAP_CURRENT) { + if (dir & KUAP_CURRENT_WRITE) { u32 kuap = current->thread.kuap; if (unlikely(!kuap)) |