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author | trociny <trociny@FreeBSD.org> | 2011-11-27 17:05:26 +0000 |
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committer | trociny <trociny@FreeBSD.org> | 2011-11-27 17:05:26 +0000 |
commit | a95ae73e491d638c5ce6606f81e8a9ec30059dc5 (patch) | |
tree | d363d3d7bbda6c9f2a525d2baa16b1ac12722e70 /sys/kern/kern_proc.c | |
parent | c4d555a3170897e61aee7f924742bf2e4e05bffb (diff) | |
download | FreeBSD-src-a95ae73e491d638c5ce6606f81e8a9ec30059dc5.zip FreeBSD-src-a95ae73e491d638c5ce6606f81e8a9ec30059dc5.tar.gz |
Add sysctl to retrieve ps_strings structure location of another process.
Suggested by: kib
Reviewed by: kib
Diffstat (limited to 'sys/kern/kern_proc.c')
-rw-r--r-- | sys/kern/kern_proc.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c index c54908e..0edcc25 100644 --- a/sys/kern/kern_proc.c +++ b/sys/kern/kern_proc.c @@ -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"); |