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| author | Will Deacon <will.deacon@arm.com> | 2014-06-02 11:47:23 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-30 20:09:42 -0700 |
| commit | 97d4477d9ed34105490a2488ced97b16860ed4a8 (patch) | |
| tree | edd70f792c868479f16120b4de9dd55483cdaee1 /lib | |
| parent | 1a2d973242a5ce1baec9dbef62548b7095b7f5aa (diff) | |
arm64: ptrace: change fs when passing kernel pointer to regset code
commit c168870704bcde6bb63d05f7882b620dd3985a46 upstream.
Our compat PTRACE_POKEUSR implementation simply passes the user data to
regset_copy_from_user after some simple range checking. Unfortunately,
the data in question has already been copied to the kernel stack by this
point, so the subsequent access_ok check fails and the ptrace request
returns -EFAULT. This causes problems tracing fork() with older versions
of strace.
This patch briefly changes the fs to KERNEL_DS, so that the access_ok
check passes even with a kernel address.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions