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authorDenys Vlasenko <vda.linux@googlemail.com>2012-03-23 15:02:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:41 -0700
commitee00560c7dac1dbbf048446a8489550d0a5765b7 (patch)
treee2a07e3ee58daa2a915634b18bb14d6c75c3e006
parent5cdf389aee90109e2e3d88085dea4dd5508a3be7 (diff)
ptrace: remove PTRACE_SEIZE_DEVEL bit
PTRACE_SEIZE code is tested and ready for production use, remove the code which requires special bit in data argument to make PTRACE_SEIZE work. Strace team prepares for a new release of strace, and we would like to ship the code which uses PTRACE_SEIZE, preferably after this change goes into released kernel. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Pedro Alves <palves@redhat.com> Cc: Jan Kratochvil <jan.kratochvil@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/ptrace.h5
-rw-r--r--kernel/ptrace.c15
2 files changed, 1 insertions, 19 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 30be18064df..407c678d2e3 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -51,9 +51,6 @@
#define PTRACE_INTERRUPT 0x4207
#define PTRACE_LISTEN 0x4208
-/* flags in @data for PTRACE_SEIZE */
-#define PTRACE_SEIZE_DEVEL 0x80000000 /* temp flag for development */
-
/* Wait extended result codes for the above trace options. */
#define PTRACE_EVENT_FORK 1
#define PTRACE_EVENT_VFORK 2
@@ -64,7 +61,7 @@
/* Extended result codes which enabled by means other than options. */
#define PTRACE_EVENT_STOP 128
-/* options set using PTRACE_SETOPTIONS */
+/* Options set using PTRACE_SETOPTIONS or using PTRACE_SEIZE @data param */
#define PTRACE_O_TRACESYSGOOD 1
#define PTRACE_O_TRACEFORK (1 << PTRACE_EVENT_FORK)
#define PTRACE_O_TRACEVFORK (1 << PTRACE_EVENT_VFORK)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4661c5bc07e..ee8d49b9c30 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -237,25 +237,10 @@ static int ptrace_attach(struct task_struct *task, long request,
bool seize = (request == PTRACE_SEIZE);
int retval;
- /*
- * SEIZE will enable new ptrace behaviors which will be implemented
- * gradually. SEIZE_DEVEL bit is used to prevent applications
- * expecting full SEIZE behaviors trapping on kernel commits which
- * are still in the process of implementing them.
- *
- * Only test programs for new ptrace behaviors being implemented
- * should set SEIZE_DEVEL. If unset, SEIZE will fail with -EIO.
- *
- * Once SEIZE behaviors are completely implemented, this flag
- * will be removed.
- */
retval = -EIO;
if (seize) {
if (addr != 0)
goto out;
- if (!(flags & PTRACE_SEIZE_DEVEL))
- goto out;
- flags &= ~(unsigned long)PTRACE_SEIZE_DEVEL;
if (flags & ~(unsigned long)PTRACE_O_MASK)
goto out;
flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);