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evm: fix writing <securityfs>/evm overflow

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[ Upstream commit 49219d9b8785ba712575c40e48ce0f7461254626 ]

EVM_SETUP_COMPLETE is defined as 0x80000000, which is larger than INT_MAX.
The "-fno-strict-overflow" compiler option properly prevents signaling
EVM that the EVM policy setup is complete.  Define and read an unsigned
int.

Fixes: f00d797507 ("EVM: Allow userspace to signal an RSA key has been loaded")
Signed-off-by: Mimi Zohar <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Mimi Zohar 2021-04-26 18:13:45 -04:00 • committed by Greg Kroah-Hartman
commit 4020615bd7
1 changed files with 3 additions and 2 deletions
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5
security/integrity/evm/evm_secfs.c
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@ -68,12 +68,13 @@ static ssize_t evm_read_key(struct file *filp, char __user *buf,
static ssize_t evm_write_key(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
int i, ret;
unsigned int i;
int ret;
if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_SETUP_COMPLETE))
return -EPERM;
ret = kstrtoint_from_user(buf, count, 0, &i);
ret = kstrtouint_from_user(buf, count, 0, &i);
if (ret)
return ret;