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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>
This commit is contained in:
Denys Vlasenko 2012-03-23 15:02:43 -07:00 committed by Linus Torvalds
parent 5cdf389aee
commit ee00560c7d
2 changed files with 1 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/ptrace.h
View File

@ -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)

15
kernel/ptrace.c
View File

@ -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);