| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.11 026/114] um: Fix PTRACE_POKEUSER on x86_64 | Date | Thu, 18 May 2017 12:45:36 +0200 |
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4.11-stable review patch. If anyone has any objections, please let me know.
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From: Richard Weinberger <richard@nod.at>
commit 9abc74a22d85ab29cef9896a2582a530da7e79bf upstream.
This is broken since ever but sadly nobody noticed. Recent versions of GDB set DR_CONTROL unconditionally and UML dies due to a heap corruption. It turns out that the PTRACE_POKEUSER was copy&pasted from i386 and assumes that addresses are 4 bytes long.
Fix that by using 8 as address size in the calculation.
Reported-by: jie cao <cj3054@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/um/ptrace_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/um/ptrace_64.c +++ b/arch/x86/um/ptrace_64.c @@ -125,7 +125,7 @@ int poke_user(struct task_struct *child, else if ((addr >= offsetof(struct user, u_debugreg[0])) && (addr <= offsetof(struct user, u_debugreg[7]))) { addr -= offsetof(struct user, u_debugreg[0]); - addr = addr >> 2; + addr = addr >> 3; if ((addr == 4) || (addr == 5)) return -EIO; child->thread.arch.debugregs[addr] = data;
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