Don't share sig handlers after an exec
Reviewed by: Alfred Perlstein
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parent
9b956e9897
commit
333ea48563
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=79480
@ -41,13 +41,14 @@
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/wait.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/sysent.h>
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#include <sys/shm.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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@ -250,6 +251,27 @@ execve(p, uap)
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p->p_fd = tmp;
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}
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/*
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* For security and other reasons, signal handlers cannot
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* be shared after an exec. The new proces gets a copy of the old
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* handlers. In execsigs(), the new process wll have its signals
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* reset.
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*/
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if (p->p_procsig->ps_refcnt > 1) {
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struct procsig *newprocsig;
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MALLOC(newprocsig, struct procsig *, sizeof(struct procsig),
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M_SUBPROC, M_WAITOK);
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bcopy(p->p_procsig, newprocsig, sizeof(*newprocsig));
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p->p_procsig->ps_refcnt--;
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p->p_procsig = newprocsig;
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p->p_procsig->ps_refcnt = 1;
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if (p->p_sigacts == &p->p_addr->u_sigacts)
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panic("shared procsig but private sigacts?\n");
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p->p_addr->u_sigacts = *p->p_sigacts;
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p->p_sigacts = &p->p_addr->u_sigacts;
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}
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/* Stop profiling */
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stopprofclock(p);
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