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Fix insecure user-space pointer dereferences in sys_waitpid.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-01-19 18:16:19 +01:00
parent 08df67eef2
commit 08c11ee45c
1 changed files with 9 additions and 10 deletions
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19
sortix/process.cpp
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@ -413,7 +413,7 @@ void Process::NotifyNewZombies()
kthread_cond_broadcast(&zombiecond);
}
pid_t Process::Wait(pid_t thepid, int* status, int options)
pid_t Process::Wait(pid_t thepid, int* user_status, int options)
{
// TODO: Process groups are not supported yet.
if ( thepid < -1 || thepid == 0 ) { errno = ENOSYS; return -1; }
@ -474,13 +474,9 @@ pid_t Process::Wait(pid_t thepid, int* status, int options)
child_execute_clock.Advance(zombie->child_execute_clock.current_time);
child_system_clock.Advance(zombie->child_system_clock.current_time);
int exitstatus = zombie->exitstatus;
if ( exitstatus < 0 )
exitstatus = W_EXITCODE(128 + SIGKILL, SIGKILL);
// TODO: Validate that status is a valid user-space int!
if ( status )
*status = exitstatus;
int status = zombie->exitstatus;
if ( status < 0 )
status = W_EXITCODE(128 + SIGKILL, SIGKILL);
kthread_mutex_lock(&zombie->groupparentlock);
bool in_limbo = zombie->groupfirst || (zombie->grouplimbo = true);
@ -490,12 +486,15 @@ pid_t Process::Wait(pid_t thepid, int* status, int options)
if ( !in_limbo )
delete zombie;
if ( user_status && !CopyToUser(user_status, &status, sizeof(status)) )
return -1;
return thepid;
}
static pid_t sys_waitpid(pid_t pid, int* status, int options)
static pid_t sys_waitpid(pid_t pid, int* user_status, int options)
{
return CurrentProcess()->Wait(pid, status, options);
return CurrentProcess()->Wait(pid, user_status, options);
}
void Process::Exit(int status)