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Allow /dev/null as path for the "/dev/mem" file, and assume that people

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know what they're doing if they do that.  This will allow ps to use
the kvm_proc.c bits without having access to /dev/mem.

Fix kvm_proc.c to not need /dev/mem for access to argv/envp
This commit is contained in:
Poul-Henning Kamp 1998-06-30 21:29:44 +00:00
parent 8cb5266728
commit 35e6b695d6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=37316
2 changed files with 37 additions and 29 deletions
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24
lib/libkvm/kvm.c
View file

@ -212,18 +212,22 @@ _kvm_open(kd, uf, mf, sf, flag, errout)
* make it work for either /dev/mem or /dev/kmem -- in either
* case you're working with a live kernel.)
*/
if (strcmp(mf, _PATH_MEM) != 0) { /* XXX */
if (strcmp(mf, _PATH_DEVNULL) == 0) {
kd->vmfd = open(_PATH_DEVNULL, O_RDONLY);
kd->swfd = open(_PATH_DEVNULL, O_RDONLY);
} else if (strcmp(mf, _PATH_MEM) != 0) {
_kvm_err(kd, kd->program,
"%s: not physical memory device", mf);
goto failed;
}
if ((kd->vmfd = open(_PATH_KMEM, flag)) < 0) {
_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
goto failed;
}
if ((kd->swfd = open(sf, flag, 0)) < 0) {
_kvm_syserr(kd, kd->program, "%s", sf);
goto failed;
} else {
if ((kd->vmfd = open(_PATH_KMEM, flag)) < 0) {
_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
goto failed;
}
if ((kd->swfd = open(sf, flag, 0)) < 0) {
_kvm_syserr(kd, kd->program, "%s", sf);
goto failed;
}
}
/*
* Open kvm nlist database. We go ahead and do this
@ -241,7 +245,7 @@ _kvm_open(kd, uf, mf, sf, flag, errout)
} else {
/*
* This is a crash dump.
* Initalize the virtual address translation machinery,
* Initialize the virtual address translation machinery,
* but first setup the namelist fd.
*/
if ((kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {

42
lib/libkvm/kvm_proc.c
View file

@ -591,17 +591,21 @@ proc_verify(kd, kernp, p)
u_long kernp;
const struct proc *p;
{
struct proc kernproc;
struct kinfo_proc kp;
int mib[4], st, len;
/*
* Just read in the whole proc. It's not that big relative
* to the cost of the read system call.
*/
if (kvm_read(kd, kernp, (char *)&kernproc, sizeof(kernproc)) !=
sizeof(kernproc))
return (0);
return (p->p_pid == kernproc.p_pid &&
(kernproc.p_stat != SZOMB || p->p_stat == SZOMB));
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = p->p_pid;
len = sizeof kp;
st = sysctl(mib, 4, &kp, &len, NULL, 0);
if (st < 0)
return(0);
return (p->p_pid == kp.kp_proc.p_pid &&
(kp.kp_proc.p_stat != SZOMB || p->p_stat == SZOMB));
}
static char **
@ -615,17 +619,17 @@ kvm_doargv(kd, kp, nchr, info)
register char **ap;
u_long addr;
int cnt;
struct ps_strings arginfo, *ps_strings;
int mib[2];
static struct ps_strings arginfo, *ps_strings;
size_t len;
int i;
ps_strings = NULL;
mib[0] = CTL_KERN;
mib[1] = KERN_PS_STRINGS;
len = sizeof(ps_strings);
if (sysctl(mib, 2, &ps_strings, &len, NULL, 0) < 0 ||
ps_strings == NULL)
ps_strings = PS_STRINGS;
if (ps_strings == NULL) {
len = sizeof ps_strings;
i = sysctlbyname("kern.ps_strings",
&ps_strings, &len, 0, 0);
if (i < 0 || ps_strings == NULL)
ps_strings = PS_STRINGS;
}
/*
* Pointers are stored at the top of the user stack.