diff options
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index 2e0b60c..e551e68 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -41,13 +41,14 @@ #include <sys/imgact.h> #include <sys/imgact_elf.h> #include <sys/wait.h> +#include <sys/malloc.h> #include <sys/proc.h> #include <sys/pioctl.h> -#include <sys/malloc.h> #include <sys/namei.h> #include <sys/sysent.h> #include <sys/shm.h> #include <sys/sysctl.h> +#include <sys/user.h> #include <sys/vnode.h> #include <vm/vm.h> @@ -250,6 +251,27 @@ interpret: p->p_fd = tmp; } + /* + * For security and other reasons, signal handlers cannot + * be shared after an exec. The new proces gets a copy of the old + * handlers. In execsigs(), the new process wll have its signals + * reset. + */ + if (p->p_procsig->ps_refcnt > 1) { + struct procsig *newprocsig; + + MALLOC(newprocsig, struct procsig *, sizeof(struct procsig), + M_SUBPROC, M_WAITOK); + bcopy(p->p_procsig, newprocsig, sizeof(*newprocsig)); + p->p_procsig->ps_refcnt--; + p->p_procsig = newprocsig; + p->p_procsig->ps_refcnt = 1; + if (p->p_sigacts == &p->p_addr->u_sigacts) + panic("shared procsig but private sigacts?\n"); + + p->p_addr->u_sigacts = *p->p_sigacts; + p->p_sigacts = &p->p_addr->u_sigacts; + } /* Stop profiling */ stopprofclock(p); |
