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This is a rewrite of the commit for the pre-64-bit time_t version of
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the msgctl handling. Similar to semctl we want the RHEL8 handling of
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the unknown commands to be the same as upstream.
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commit be9b0b9a012780a403a266c90878efffb9a5f3ca
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Tue Sep 29 14:45:09 2020 -0300
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sysvipc: Return EINVAL for invalid msgctl commands
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It avoids regressions on possible future commands that might require
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additional libc support. The downside is new commands added by newer
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kernels will need further glibc support.
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Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).
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diff --git a/sysdeps/unix/sysv/linux/msgctl.c b/sysdeps/unix/sysv/linux/msgctl.c
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index 7280cba31a8815a2..6a2c79d188b875b9 100644
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--- a/sysdeps/unix/sysv/linux/msgctl.c
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+++ b/sysdeps/unix/sysv/linux/msgctl.c
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@@ -29,6 +29,20 @@
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int
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__new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
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{
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+ switch (cmd)
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+ {
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+ case IPC_RMID:
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+ case IPC_SET:
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+ case IPC_STAT:
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+ case MSG_STAT:
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+ case MSG_STAT_ANY:
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+ case IPC_INFO:
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+ case MSG_INFO:
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+ break;
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+ default:
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
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return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
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#else
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diff --git a/sysvipc/test-sysvipc.h b/sysvipc/test-sysvipc.h
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index ed0057b7871e505c..133fb71c6113a2b5 100644
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--- a/sysvipc/test-sysvipc.h
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+++ b/sysvipc/test-sysvipc.h
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@@ -134,4 +134,29 @@ first_shm_invalid_cmd (void)
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return invalid;
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}
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+/* Return the first invalid command SysV IPC command for message queue. */
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+static inline int
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+first_msg_invalid_cmd (void)
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+{
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+ const int msg_cmds[] = {
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+ MSG_STAT,
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+ MSG_INFO,
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+#ifdef MSG_STAT_ANY
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+ MSG_STAT_ANY,
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+#endif
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+ };
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+
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+ int invalid = first_common_invalid_cmd ();
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+ for (int i = 0; i < array_length (msg_cmds); i++)
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+ {
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+ if (invalid == msg_cmds[i])
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+ {
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+ invalid++;
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+ i = 0;
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+ }
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+ }
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+
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+ return invalid;
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+}
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+
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#endif /* _TEST_SYSV_H */
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diff --git a/sysvipc/test-sysvmsg.c b/sysvipc/test-sysvmsg.c
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index 1e0471807cd26da1..74a907ad39ee114e 100644
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--- a/sysvipc/test-sysvmsg.c
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+++ b/sysvipc/test-sysvmsg.c
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@@ -24,6 +24,8 @@
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#include <sys/ipc.h>
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#include <sys/msg.h>
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+#include <test-sysvipc.h>
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+
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#include <support/support.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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@@ -86,6 +88,9 @@ do_test (void)
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FAIL_EXIT1 ("msgget failed (errno=%d)", errno);
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}
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+ TEST_COMPARE (msgctl (msqid, first_msg_invalid_cmd (), NULL), -1);
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+ TEST_COMPARE (errno, EINVAL);
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+
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/* Get message queue kernel information and do some sanity checks. */
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struct msqid_ds msginfo;
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if (msgctl (msqid, IPC_STAT, &msginfo) == -1)
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