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Abstract out the construction of proc path generation more.

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Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Kees Cook <kees.cook@canonical.com>
This commit is contained in:
John Johansen 2011-07-21 11:09:22 -07:00
parent 2c110ed3d5
commit 3f59259dec
1 changed files with 14 additions and 7 deletions
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21
libraries/libapparmor/src/kernel_interface.c
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@ -46,10 +46,18 @@ static inline pid_t aa_gettid(void)
#endif
}
static int setprocattr(const char *path, const char *buf, int len)
static char *procattr_path(pid_t pid, const char *attr)
{
char *path = NULL;
if (asprintf(&path, "/proc/%d/attr/%s", pid, attr) > 0)
return path;
return NULL;
}
static int setprocattr(const char *attr, const char *buf, int len)
{
int rc = -1;
int fd, ret, ctlerr = 0;
int fd, ret;
char *ctl = NULL;
pid_t tid = aa_gettid();
@ -58,10 +66,9 @@ static int setprocattr(const char *path, const char *buf, int len)
goto out;
}
ctlerr = asprintf(&ctl, path, tid);
if (ctlerr < 0) {
ctl = procattr_path(tid, attr);
if (!ctl)
goto out;
}
fd = open(ctl, O_WRONLY);
if (fd == -1) {
@ -113,7 +120,7 @@ int aa_change_hat(const char *subprofile, unsigned long token)
goto out;
}
rc = setprocattr("/proc/%d/attr/current", buf, len);
rc = setprocattr("current", buf, len);
out:
if (buf) {
/* clear local copy of magic token before freeing */
@ -144,7 +151,7 @@ int aa_change_profile(const char *profile)
if (len < 0)
return -1;
rc = setprocattr("/proc/%d/attr/current", buf, len);
rc = setprocattr("current", buf, len);
free(buf);
return rc;