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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-21 17:11:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-21 17:11:07 -0800 |
| commit | 92ae63c07b8fba40f960c7286403bbdc90e46655 (patch) | |
| tree | f42faba5e0434b21fa4c0ed0dde3b1b75586004b /security | |
| parent | d643a990891abdb0fd93ff3740a6f7222fbb756c (diff) | |
| parent | 7ef4c19d245f3dc233fd4be5acea436edd1d83d8 (diff) | |
| download | lwn-92ae63c07b8fba40f960c7286403bbdc90e46655.tar.gz lwn-92ae63c07b8fba40f960c7286403bbdc90e46655.zip | |
Merge tag 'Smack-for-v5.12' of git://github.com/cschaufler/smack-next
Pull smack updates from Casey Schaufler:
"Bounds checking for writes to smackfs interfaces"
* tag 'Smack-for-v5.12' of git://github.com/cschaufler/smack-next:
smackfs: restrict bytes count in smackfs write functions
Diffstat (limited to 'security')
| -rw-r--r-- | security/smack/smackfs.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 5d44b7d258ef..22ded2c26089 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -1167,7 +1167,7 @@ static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_NETLBLADDRMIN) + if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) return -EINVAL; data = memdup_user_nul(buf, count); @@ -1427,7 +1427,7 @@ static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_NETLBLADDRMIN) + if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) return -EINVAL; data = memdup_user_nul(buf, count); @@ -1834,6 +1834,10 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + /* Enough data must be present */ + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2005,6 +2009,9 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + if (count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2092,6 +2099,9 @@ static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + if (count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2648,6 +2658,10 @@ static ssize_t smk_write_syslog(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + /* Enough data must be present */ + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2740,10 +2754,13 @@ static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, return -EPERM; /* + * No partial write. * Enough data must be present. */ if (*ppos != 0) return -EINVAL; + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; data = memdup_user_nul(buf, count); if (IS_ERR(data)) |