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Subject[PATCH] audit: do a quick exit when syscall number is invalid
Date
From: Yang Yang <yang.yang29@zte.com.cn>

Userspace may use syscall with invalid syscall number by calling
syscall(syscall_num,..). For example we found openSSH may use
syscall with syscall number is -1 in some case. When that happens
we better do a quick handle no need to gohead.

Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Reported-by: Zeal Robot <zealci@zte.com.cn>
---
kernel/auditsc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index ea2ee1181921..806cd57d7f20 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2077,7 +2077,8 @@ void __audit_syscall_exit(int success, long return_code)
struct audit_context *context = audit_context();

if (!context || context->dummy ||
- context->context != AUDIT_CTX_SYSCALL)
+ context->context != AUDIT_CTX_SYSCALL ||
+ unlikely(context->major < 0 || context->major > NR_syscalls))
goto out;

/* this may generate CONFIG_CHANGE records */
--
2.25.1
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