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Add sysctl to retrieve ps_strings structure location of another process.

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Suggested by:	kib
Reviewed by:	kib
This commit is contained in:
trociny 2011-11-27 17:05:26 +00:00
parent c4d555a317
commit a95ae73e49
1 changed files with 57 additions and 0 deletions
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57
sys/kern/kern_proc.c
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@ -2434,6 +2434,59 @@ sysctl_kern_proc_rlimit(SYSCTL_HANDLER_ARGS)
return (error);
}
/*
* This sysctl allows a process to retrieve ps_strings structure location of
* another process.
*/
static int
sysctl_kern_proc_ps_strings(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct proc *p;
vm_offset_t ps_strings;
int error;
#ifdef COMPAT_FREEBSD32
uint32_t ps_strings32;
#endif
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (p == NULL)
return (ESRCH);
if (p->p_flag & P_WEXIT) {
PROC_UNLOCK(p);
return (ESRCH);
}
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
if ((p->p_flag & P_SYSTEM) != 0) {
PROC_UNLOCK(p);
return (0);
}
#ifdef COMPAT_FREEBSD32
if ((req->flags & SCTL_MASK32) != 0) {
/*
* We return 0 if the 32 bit emulation request is for a 64 bit
* process.
*/
ps_strings32 = SV_PROC_FLAG(p, SV_ILP32) != 0 ?
PTROUT(p->p_sysent->sv_psstrings) : 0;
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, &ps_strings32, sizeof(ps_strings32));
return (error);
}
#endif
ps_strings = p->p_sysent->sv_psstrings;
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, &ps_strings, sizeof(ps_strings));
return (error);
}
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
@ -2532,3 +2585,7 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC_GROUPS, groups, CTLFLAG_RD |
static SYSCTL_NODE(_kern_proc, KERN_PROC_RLIMIT, rlimit, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_rlimit, "Process resource limits");
static SYSCTL_NODE(_kern_proc, KERN_PROC_PS_STRINGS, ps_strings,
CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE,
sysctl_kern_proc_ps_strings, "Process ps_strings location");