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Yikes! Originally, i intended to apply the patch from PR # 1322,

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but Bill has beaten me on this. ;-)

However, he missed the part to compute the kernelsize in kilobytes,
so the minfree consideration was now overcautious.  (I've also
changed the return type of dump_size() to void since int was useless.)

Being here, the fact that `vmcore' was written world-readable was just
a plain security hole: everybody who was able to crash a kernel could
later read any confidential information out of it at his will.  Create
it with umask 077 instead.
This commit is contained in:
Joerg Wunsch 1996-10-13 20:55:45 +00:00
parent e29754402a
commit 927e7941a3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18916
1 changed files with 6 additions and 5 deletions
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11
sbin/savecore/savecore.c
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@ -119,7 +119,7 @@ int Create __P((char *, int));
int dump_exists __P((void));
char *find_dev __P((dev_t, int));
int get_crashtime __P((void));
int get_dumpsize __P((void));
void get_dumpsize __P((void));
void kmem_setup __P((void));
void log __P((int, char *, ...));
void Lseek __P((int, off_t, int));
@ -332,6 +332,7 @@ save_core()
register FILE *fp;
register int bounds, ifd, nr, nw, ofd;
char *rawp, path[MAXPATHLEN];
mode_t oumask;
/*
* Get the current number and update the bounds file. Do the update
@ -356,6 +357,7 @@ err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno));
}
/* Create the core file. */
oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
(void)snprintf(path, sizeof(path), "%s/vmcore.%d%s",
dirname, bounds, compress ? ".Z" : "");
if (compress) {
@ -365,6 +367,7 @@ err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno));
}
} else
ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
(void)umask(oumask);
/* Open the raw device. */
rawp = rawname(ddname);
@ -526,15 +529,13 @@ get_crashtime()
return (1);
}
int
void
get_dumpsize()
{
/* Read the dump size. */
Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET);
(void)Read(dumpfd, &dumpsize, sizeof(dumpsize));
dumpsize *= getpagesize();
return(1);
}
int
@ -552,7 +553,7 @@ check_space()
syslog(LOG_ERR, "%s: %m", tkernel);
exit(1);
}
kernelsize = st.st_blocks * S_BLKSIZE;
kernelsize = (st.st_blocks * S_BLKSIZE) / 1024;
if (statfs(dirname, &fsbuf) < 0) {
syslog(LOG_ERR, "%s: %m", dirname);