On Fri, Mar 18, 2016 at 05:21:28PM -0400, Patrick Donnelly wrote:

The ptrace(2) man page says that PTRACE_SEIZE, PTRACE_LISTEN, and
PTRACE_INTERRUPT was introduced in Linux 3.4. In fact, this was added
in 3.1:

$ git diff v3.0 v3.1 include/linux/ptrace.h | grep SEIZE
+#define PTRACE_SEIZE           0x4206
+/* flags in @data for PTRACE_SEIZE */
+#define PTRACE_SEIZE_DEVEL     0x80000000 /* temp flag for development */

Yes, PTRACE_SEIZE was introduced by commit v3.1-rc1~308^2~28, but
it had to be used along with a temporary flag PTRACE_SEIZE_DEVEL,
which was removed later by commit v3.4-rc1~109^2~20.

That is, between v3.0 and v3.4 we had a test mode of PTRACE_SEIZE API,
which was not compatible with the current PTRACE_SEIZE API introduced
in Linux 3.4.


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ldv