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-rw-r--r--kernel/ptrace.c31
1 files changed, 21 insertions, 10 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 9acd07a6f5bb..4661c5bc07e5 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -231,6 +231,7 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
}
static int ptrace_attach(struct task_struct *task, long request,
+ unsigned long addr,
unsigned long flags)
{
bool seize = (request == PTRACE_SEIZE);
@@ -238,19 +239,29 @@ static int ptrace_attach(struct task_struct *task, long request,
/*
* SEIZE will enable new ptrace behaviors which will be implemented
- * gradually. SEIZE_DEVEL is used to prevent applications
+ * gradually. SEIZE_DEVEL bit is used to prevent applications
* expecting full SEIZE behaviors trapping on kernel commits which
* are still in the process of implementing them.
*
* Only test programs for new ptrace behaviors being implemented
* should set SEIZE_DEVEL. If unset, SEIZE will fail with -EIO.
*
- * Once SEIZE behaviors are completely implemented, this flag and
- * the following test will be removed.
+ * Once SEIZE behaviors are completely implemented, this flag
+ * will be removed.
*/
retval = -EIO;
- if (seize && !(flags & PTRACE_SEIZE_DEVEL))
- goto out;
+ if (seize) {
+ if (addr != 0)
+ goto out;
+ if (!(flags & PTRACE_SEIZE_DEVEL))
+ goto out;
+ flags &= ~(unsigned long)PTRACE_SEIZE_DEVEL;
+ if (flags & ~(unsigned long)PTRACE_O_MASK)
+ goto out;
+ flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);
+ } else {
+ flags = PT_PTRACED;
+ }
audit_ptrace(task);
@@ -282,11 +293,11 @@ static int ptrace_attach(struct task_struct *task, long request,
if (task->ptrace)
goto unlock_tasklist;
- task->ptrace = PT_PTRACED;
if (seize)
- task->ptrace |= PT_SEIZED;
+ flags |= PT_SEIZED;
if (ns_capable(task_user_ns(task), CAP_SYS_PTRACE))
- task->ptrace |= PT_PTRACE_CAP;
+ flags |= PT_PTRACE_CAP;
+ task->ptrace = flags;
__ptrace_link(task, current);
@@ -879,7 +890,7 @@ SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
}
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
- ret = ptrace_attach(child, request, data);
+ ret = ptrace_attach(child, request, addr, data);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.
@@ -1022,7 +1033,7 @@ asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
}
if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
- ret = ptrace_attach(child, request, data);
+ ret = ptrace_attach(child, request, addr, data);
/*
* Some architectures need to do book-keeping after
* a ptrace attach.