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authorDave Martin <Dave.Martin@arm.com>2017-03-27 14:10:57 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-31 08:31:46 (GMT)
commit21c95eca627bf63fa56dc19f5fb5fb2a770dadc0 (patch)
treed83d5e2a515fa0cc510ed0a8ee80a0a7799d448a
parent2d6532ceb45bffcc05036f93a0590ffa82c7794f (diff)
downloadlinux-21c95eca627bf63fa56dc19f5fb5fb2a770dadc0.tar.xz
metag/ptrace: Reject partial NT_METAG_RPIPE writes
commit 7195ee3120d878259e8d94a5d9f808116f34d5ea upstream. It's not clear what behaviour is sensible when doing partial write of NT_METAG_RPIPE, so just don't bother. This patch assumes that userspace will never rely on a partial SETREGSET in this case, since it's not clear what should happen anyway. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Acked-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/metag/kernel/ptrace.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/metag/kernel/ptrace.c b/arch/metag/kernel/ptrace.c
index 2e4dfc1..5e2dc7d 100644
--- a/arch/metag/kernel/ptrace.c
+++ b/arch/metag/kernel/ptrace.c
@@ -253,6 +253,8 @@ int metag_rp_state_copyin(struct pt_regs *regs,
unsigned long long *ptr;
int ret, i;
+ if (count < 4*13)
+ return -EINVAL;
/* Read the entire pipeline before making any changes */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&rp, 0, 4*13);