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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2021-05-05 16:49:41 +0200
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2021-05-06 14:51:08 +0200
commit5172ef4a58bda5be18dcdbbe0abd2c6bb4f08743 (patch)
tree23671f963e60d668b937b65cbd32f6efa2bd7fc0
parent964a13d17be3426ecf539a5155e2cb8b4c16fb31 (diff)
downloadsystemd-5172ef4a58bda5be18dcdbbe0abd2c6bb4f08743.tar.gz
sd-device: do no allocate strings of unknown length on the stack
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33881. Not only we would duplicate unknown input on the stack, we would do it over and over. So let's first check that the input has reasonable length, but also allocate just one fixed size buffer. (cherry picked from commit e17c95af8e450caacde692875b30675cea75211f)
-rw-r--r--src/libsystemd/sd-device/sd-device.c54
-rw-r--r--test/fuzz/fuzz-journald-kmsg/oss-fuzz-338814
2 files changed, 31 insertions, 27 deletions
diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index 1b73005fc2..bb4d453cee 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -245,29 +245,31 @@ _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum)
}
_public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) {
- char *name, *syspath;
- size_t len = 0;
+ char syspath[PATH_MAX], *name;
assert_return(ret, -EINVAL);
assert_return(subsystem, -EINVAL);
assert_return(sysname, -EINVAL);
+ assert_return(strlen(sysname) < PATH_MAX - strlen("/sys/bus/"), -ENAMETOOLONG);
if (streq(subsystem, "subsystem")) {
- syspath = strjoina("/sys/subsystem/", sysname);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/subsystem/%s", sysname) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/bus/", sysname);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/bus/%s", sysname) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/class/", sysname);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/class/%s", sysname) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
+
} else if (streq(subsystem, "module")) {
- syspath = strjoina("/sys/module/", sysname);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/module/%s", sysname) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
+
} else if (streq(subsystem, "drivers")) {
char subsys[PATH_MAX];
char *driver;
@@ -278,39 +280,37 @@ _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *s
driver[0] = '\0';
driver++;
- syspath = strjoina("/sys/subsystem/", subsys, "/drivers/", driver);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/subsystem/%s/drivers/%s", subsys, driver) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/bus/%s/drivers/%s", subsys, driver) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
}
}
/* translate sysname back to sysfs filename */
name = strdupa(sysname);
- while (name[len] != '\0') {
- if (name[len] == '/')
- name[len] = '!';
- len++;
- }
+ for (size_t i = 0; name[i]; i++)
+ if (name[i] == '/')
+ name[i] = '!';
- syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/subsystem/%s/devices/%s", subsystem, name) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/bus/", subsystem, "/devices/", name);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/bus/%s/devices/%s", subsystem, name) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/class/", subsystem, "/", name);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/class/%s/%s", subsystem, name) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
- syspath = strjoina("/sys/firmware/", subsystem, "/", sysname);
- if (access(syspath, F_OK) >= 0)
+ if (snprintf_ok(syspath, sizeof syspath, "/sys/firmware/%s/%s", subsystem, sysname) &&
+ access(syspath, F_OK) >= 0)
return sd_device_new_from_syspath(ret, syspath);
return -ENODEV;
diff --git a/test/fuzz/fuzz-journald-kmsg/oss-fuzz-33881 b/test/fuzz/fuzz-journald-kmsg/oss-fuzz-33881
new file mode 100644
index 0000000000..ad4f3f0574
--- /dev/null
+++ b/test/fuzz/fuzz-journald-kmsg/oss-fuzz-33881
@@ -0,0 +1,4 @@
+8,0,1;2,0,7;
+ DEVICE=+subsystem:tty/t000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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