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| author | Andrew Donnellan <ajd@linux.ibm.com> | 2019-12-10 00:22:21 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-12-16 23:19:44 +1100 |
| commit | 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7 (patch) | |
| tree | bdc47c5f24399173d911615fb312fd0be8fa4a53 /Documentation/arm64/acpi_object_usage.rst | |
| parent | e352f576d345e5bf1fb62c8559851448a6c1d9cd (diff) | |
| download | linux-61e3acd8c693a14fc69b824cb5b08d02cb90a6e7.tar.bz2 | |
powerpc: Fix __clear_user() with KUAP enabled
The KUAP implementation adds calls in clear_user() to enable and
disable access to userspace memory. However, it doesn't add these to
__clear_user(), which is used in the ptrace regset code.
As there's only one direct user of __clear_user() (the regset code),
and the time taken to set the AMR for KUAP purposes is going to
dominate the cost of a quick access_ok(), there's not much point
having a separate path.
Rename __clear_user() to __arch_clear_user(), and make __clear_user()
just call clear_user().
Reported-by: syzbot+f25ecf4b2982d8c7a640@syzkaller-ppc64.appspotmail.com
Reported-by: Daniel Axtens <dja@axtens.net>
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Fixes: de78a9c42a79 ("powerpc: Add a framework for Kernel Userspace Access Protection")
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
[mpe: Use __arch_clear_user() for the asm version like arm64 & nds32]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191209132221.15328-1-ajd@linux.ibm.com
Diffstat (limited to 'Documentation/arm64/acpi_object_usage.rst')
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