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Staging: p9auth: a few fixes
1. The memory into which we copy 'u1@u2' needs space for u1, @, u2, and a final \0 which strcat copies in. 2. Strsep changes the value of its first argument. So use a temporary variable to pass to it, so we pass the original value to kfree! 3. Allocate an extra char to user_buf, because we need a trailing \0 since we later kstrdup it. I am about to send out an LTP testcase for this driver, but in addition the correctness of the hashing can be verified as follows: #include <stdio.h> #include <stdlib.h> #include <unistd.h> int main(int argc, char *argv[]) { char in[41], out[20]; unsigned int v; int i, ret; ret = read(STDIN_FILENO, in, 40); if (ret != 40) exit(1); in[40] = '\0'; for (i = 0; i < 20; i++) { sscanf(&in[2*i], "%02x", &v); out[i] = v; } write(STDOUT_FILENO, out, 20); } as root, to test userid 501 switching to uid 0, choosing 'random' string 'ab': echo -n "501@0" > plain openssl sha1 -hmac 'ab' plain |awk '{ print $2 '} > dgst ./unhex < dgst > dgst.u mknod /dev/caphash 504 0 mknod /dev/capuse 504 1 chmod ugo+w /dev/capuse cat dgst.u > /dev/caphash as uid 501, echo "501@0@ab" > /dev/capuse id -u # should now show 0. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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parent
3d14b51848
commit
a8ba8bffbe
1 changed files with 8 additions and 6 deletions
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@ -183,7 +183,7 @@ static ssize_t cap_write(struct file *filp, const char __user *buf,
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user_buf_running = NULL;
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hash_str = NULL;
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node_ptr = kmalloc(sizeof(struct cap_node), GFP_KERNEL);
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user_buf = kzalloc(count, GFP_KERNEL);
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user_buf = kzalloc(count+1, GFP_KERNEL);
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if (!node_ptr || !user_buf)
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goto out;
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@ -207,6 +207,7 @@ static ssize_t cap_write(struct file *filp, const char __user *buf,
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list_add(&(node_ptr->list), &(dev->head->list));
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node_ptr = NULL;
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} else {
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char *tmpu;
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if (!cap_devices[0].head ||
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list_empty(&(cap_devices[0].head->list))) {
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retval = -EINVAL;
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@ -218,10 +219,10 @@ static ssize_t cap_write(struct file *filp, const char __user *buf,
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* need to split it and hash 'user1@user2' using 'randomstring'
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* as the key.
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*/
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user_buf_running = kstrdup(user_buf, GFP_KERNEL);
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source_user = strsep(&user_buf_running, "@");
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target_user = strsep(&user_buf_running, "@");
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rand_str = strsep(&user_buf_running, "@");
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tmpu = user_buf_running = kstrdup(user_buf, GFP_KERNEL);
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source_user = strsep(&tmpu, "@");
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target_user = strsep(&tmpu, "@");
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rand_str = tmpu;
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if (!source_user || !target_user || !rand_str) {
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retval = -EINVAL;
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goto out;
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@ -229,7 +230,8 @@ static ssize_t cap_write(struct file *filp, const char __user *buf,
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/* hash the string user1@user2 with rand_str as the key */
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len = strlen(source_user) + strlen(target_user) + 1;
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hash_str = kzalloc(len, GFP_KERNEL);
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/* src, @, len, \0 */
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hash_str = kzalloc(len+1, GFP_KERNEL);
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strcat(hash_str, source_user);
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strcat(hash_str, "@");
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strcat(hash_str, target_user);
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