[PATCH] Smack: Fix memory leak in smack_inode_getsecctx
From: casey@schaufler-ca.com (Casey Schaufler)
Date: 2018-06-04 21:01:37
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On 6/1/2018 10:45 AM, Casey Schaufler wrote:
Fix memory leak in smack_inode_getsecctx The implementation of smack_inode_getsecctx() made incorrect assumptions about how Smack presents a security context. Smack does not need to allocate memory to support security contexts, so "releasing" a Smack context is a no-op. The code made an unnecessary copy and returned that as a context, which was never freed. The revised implementation returns the context correctly. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Tejun, does this pass your tests?
quoted hunk ↗ jump to hunk
--- security/smack/smack_lsm.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-)diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 0b414836bebd..5e3beae334a8 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c@@ -1545,9 +1545,9 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer, */ static void smack_inode_getsecid(struct inode *inode, u32 *secid) { - struct inode_smack *isp = inode->i_security; + struct smack_known *skp = smk_of_inode(inode); - *secid = isp->smk_inode->smk_secid; + *secid = skp->smk_secid; } /*@@ -4538,12 +4538,10 @@ static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) { - int len = 0; - len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); + struct smack_known *skp = smk_of_inode(inode); - if (len < 0) - return len; - *ctxlen = len; + *ctx = skp->smk_known; + *ctxlen = strlen(skp->smk_known); return 0; } --To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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