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| author | Al Viro <viro@ftp.linux.org.uk> | 2007-03-12 16:17:42 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-14 15:27:48 -0700 |
| commit | c4823bce033be74c0fcfbcae2f1be0854fdc2e18 (patch) | |
| tree | a37dce7574167fc3639b70bab2626bbf8eb896e3 /kernel/auditsc.c | |
| parent | baab1087c61d4506f2c9f4cdb7da162160de16c2 (diff) | |
| download | lwn-c4823bce033be74c0fcfbcae2f1be0854fdc2e18.tar.gz lwn-c4823bce033be74c0fcfbcae2f1be0854fdc2e18.zip | |
[PATCH] fix deadlock in audit_log_task_context()
GFP_KERNEL allocations in non-blocking context; fixed by killing
an idiotic use of security_getprocattr().
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/auditsc.c')
| -rw-r--r-- | kernel/auditsc.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 359955800dd2..628c7ac590a0 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -739,28 +739,26 @@ static inline void audit_free_context(struct audit_context *context) void audit_log_task_context(struct audit_buffer *ab) { char *ctx = NULL; - ssize_t len = 0; + unsigned len; + int error; + u32 sid; + + selinux_get_task_sid(current, &sid); + if (!sid) + return; - len = security_getprocattr(current, "current", NULL, 0); - if (len < 0) { - if (len != -EINVAL) + error = selinux_sid_to_string(sid, &ctx, &len); + if (error) { + if (error != -EINVAL) goto error_path; return; } - ctx = kmalloc(len, GFP_KERNEL); - if (!ctx) - goto error_path; - - len = security_getprocattr(current, "current", ctx, len); - if (len < 0 ) - goto error_path; - audit_log_format(ab, " subj=%s", ctx); + kfree(ctx); return; error_path: - kfree(ctx); audit_panic("error in audit_log_task_context"); return; } |