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ptrace: Prevent kernel-infoleak in ptrace_get_syscall_info()

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ptrace_get_syscall_info() is potentially copying uninitialized stack
memory to userspace, since the compiler may leave a 3-byte hole near the
beginning of `info`. Fix it by adding a padding field to `struct
ptrace_syscall_info`.

Fixes: 201766a20e ("ptrace: add PTRACE_GET_SYSCALL_INFO request")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200801152044.230416-1-yepeilin.cs@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Peilin Ye 2020-08-01 11:20:44 -04:00 committed by Christian Brauner
parent 9123e3a74e
commit 0032ce0f85
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GPG key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 1 deletions
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3
include/uapi/linux/ptrace.h
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@ -81,7 +81,8 @@ struct seccomp_metadata {
struct ptrace_syscall_info {
__u8 op; /* PTRACE_SYSCALL_INFO_* */
__u32 arch __attribute__((__aligned__(sizeof(__u32))));
__u8 pad[3];
__u32 arch;
__u64 instruction_pointer;
__u64 stack_pointer;
union {