* [PATCH] um: Fix FD copy size in os_rcv_fd_msg()
@ 2025-09-01 0:27 Tiwei Bie
0 siblings, 0 replies; only message in thread
From: Tiwei Bie @ 2025-09-01 0:27 UTC (permalink / raw)
To: richard, anton.ivanov, johannes; +Cc: linux-um, tiwei.btw, tiwei.bie
From: Tiwei Bie <tiwei.btw@antgroup.com>
When copying FDs, the copy size should not include the control
message header (cmsghdr). Fix it.
Fixes: 5cde6096a4dd ("um: generalize os_rcv_fd")
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
---
arch/um/os-Linux/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 617886d1fb1e..21f0e50fb1df 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -535,7 +535,7 @@ ssize_t os_rcv_fd_msg(int fd, int *fds, unsigned int n_fds,
cmsg->cmsg_type != SCM_RIGHTS)
return n;
- memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len);
+ memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len - CMSG_LEN(0));
return n;
}
--
2.34.1
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2025-09-01 0:27 [PATCH] um: Fix FD copy size in os_rcv_fd_msg() Tiwei Bie
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