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| author |   Will Deacon <will.deacon@arm.com> | 2014-06-02 11:47:23 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2014-06-18 12:40:57 +0100 |
| commit | c168870704bcde6bb63d05f7882b620dd3985a46 (patch) | |
| tree | 174f2ba42679903c0178f1a684adcad893e18b4e /arch/arm64/include/uapi/asm/posix_types.h | |
| parent | arm64: Limit the CMA buffer to 32-bit if ZONE_DMA (diff) | |
| download | linux-dev-c168870704bcde6bb63d05f7882b620dd3985a46.tar.xz linux-dev-c168870704bcde6bb63d05f7882b620dd3985a46.zip | |
arm64: ptrace: change fs when passing kernel pointer to regset code
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>
Diffstat (limited to 'arch/arm64/include/uapi/asm/posix_types.h')
0 files changed, 0 insertions, 0 deletions