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authorWill Deacon <will.deacon@arm.com>2014-06-02 11:47:23 +0100
committerMark Brown <broonie@linaro.org>2014-07-23 00:02:44 +0100
commitc94bbb52ec7e667b597cc528a44382f859921b29 (patch)
treedc63e61c4604f1589dfcdbb315aee91537ce00dd /include
parent455c6fdbd219161bd09b1165f11699d6d73de11c (diff)
arm64: ptrace: change fs when passing kernel pointer to regset codev3.14/topic/arm64-ptrace
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> Cc: <stable@vger.kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> (cherry picked from commit c168870704bcde6bb63d05f7882b620dd3985a46) Signed-off-by: Mark Brown <broonie@linaro.org>
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