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441c147179
udev_device.c: fix TOCTOU race condition (illiliti/libudev-zero#57) illiliti/libudev-zero@a2cc51bb14 Avoidable OOM on small systems (illiliti/libudev-zero#62) illiliti/libudev-zero@5eca08d71d Fixes incorrect detection of touchpads (illiliti/libudev-zero#66) illiliti/libudev-zero@bbeb7ad51c Signed-off-by: Daniel Golle <daniel@makrotopia.org>
60 lines
1.5 KiB
Diff
60 lines
1.5 KiB
Diff
From a2cc51bb142c16eac5598237d2edb46f095607be Mon Sep 17 00:00:00 2001
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From: Mingjie Shen <mjshen137@gmail.com>
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Date: Tue, 5 Dec 2023 03:41:24 -0500
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Subject: [PATCH] udev_device.c: fix TOCTOU race condition (#57)
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Separately checking the state of a file before operating on it may allow
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an attacker to modify the file between the two operations.
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Reference: CWE-367.
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---
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udev_device.c | 18 ++++++++++--------
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1 file changed, 10 insertions(+), 8 deletions(-)
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--- a/udev_device.c
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+++ b/udev_device.c
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@@ -267,16 +267,17 @@ const char *udev_device_get_sysattr_valu
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snprintf(path, sizeof(path), "%s/%s", udev_device_get_syspath(udev_device), sysattr);
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- if (lstat(path, &st) != 0 || !S_ISREG(st.st_mode)) {
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- return NULL;
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- }
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-
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file = fopen(path, "r");
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if (!file) {
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return NULL;
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}
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+ if (fstat(fileno(file), &st) != 0 || !S_ISREG(st.st_mode)) {
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+ fclose(file);
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+ return NULL;
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+ }
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+
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// TODO dynamic allocation of data
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len = fread(data, 1, sizeof(data) - 1, file);
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@@ -309,16 +310,17 @@ int udev_device_set_sysattr_value(struct
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snprintf(path, sizeof(path), "%s/%s", udev_device_get_syspath(udev_device), sysattr);
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- if (lstat(path, &st) != 0 || !S_ISREG(st.st_mode)) {
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- return -1;
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- }
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-
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file = fopen(path, "w");
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if (!file) {
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return -1;
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}
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+ if (fstat(fileno(file), &st) != 0 || !S_ISREG(st.st_mode)) {
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+ fclose(file);
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+ return -1;
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+ }
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+
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len = strlen(value);
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if (fwrite(value, 1, len, file) != len) {
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