[PATCH 3.10 21/77] arm64: ptrace: change fs when passing kernel pointer to regset code

From: Greg Kroah-Hartman
Date: Sat Jun 28 2014 - 15:10:01 EST


3.10-stable review patch. If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/arm64/kernel/ptrace.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -872,6 +872,7 @@ static int compat_ptrace_write_user(stru
compat_ulong_t val)
{
int ret;
+ mm_segment_t old_fs = get_fs();

if (off & 3 || off >= COMPAT_USER_SZ)
return -EIO;
@@ -879,10 +880,13 @@ static int compat_ptrace_write_user(stru
if (off >= sizeof(compat_elf_gregset_t))
return 0;

+ set_fs(KERNEL_DS);
ret = copy_regset_from_user(tsk, &user_aarch32_view,
REGSET_COMPAT_GPR, off,
sizeof(compat_ulong_t),
&val);
+ set_fs(old_fs);
+
return ret;
}



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