diff options
| author | Dave Martin <Dave.Martin@arm.com> | 2017-01-18 16:25:22 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-26 08:24:41 +0100 |
| commit | 5c5839be08423b8a76d40beb59165e7993b4d455 (patch) | |
| tree | c03d716a38b4e7edee926c41f2d6cfff3c0f2aee /arch | |
| parent | a4aafb8c4204c3a672b3340ae66e731148a30cd1 (diff) | |
arm64/ptrace: Preserve previous registers for short regset write - 3
commit a672401c00f82e4e19704aff361d9bad18003714 upstream.
Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.
Fixes: 5d220ff9420f ("arm64: Better native ptrace support for compat tasks")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-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 'arch')
| -rw-r--r-- | arch/arm64/kernel/ptrace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 59f562bba319..143f770247c2 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -949,7 +949,7 @@ static int compat_tls_set(struct task_struct *target, const void __user *ubuf) { int ret; - compat_ulong_t tls; + compat_ulong_t tls = target->thread.tp_value; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1); if (ret) |