[DTrace-devel] [PATCH 1/3] pid: ensure pid offset probes perform lookup with adjusted address

[Nick Alcock]

On 9 Feb 2026, Kris Van Hees via DTrace-devel stated:

> For PIE executables and libraries, pid offset probes need to have the
> address adjusted based on the actual segment load address.
>
> Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>

Looks good (in particular it's good that we're actually recording that
this is PIE rather than relying on a usually-right guess), modulo one
tiny nit:

> ---
>  include/sys/sol_procfs.h | 3 ++-
>  libdtrace/dt_pid.c       | 3 +++
>  libproc/Psymtab.c        | 7 +++++--
>  3 files changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/include/sys/sol_procfs.h b/include/sys/sol_procfs.h
> index d195a108..950ab31a 100644
> --- a/include/sys/sol_procfs.h
> +++ b/include/sys/sol_procfs.h
> @@ -1,6 +1,6 @@
>  /*
>   * Oracle Linux DTrace.
> - * Copyright (c) 2006, 2022, Oracle and/or its affiliates. All rights reserved.
> + * Copyright (c) 2006, 2026, Oracle and/or its affiliates. All rights reserved.
>   * Licensed under the Universal Permissive License v 1.0 as shown at
>   * http://oss.oracle.com/licenses/upl.
>   */
> @@ -50,6 +50,7 @@ typedef struct prmap {
>  
>  
>  /* Protection and attribute flags */
> +#define MA_PIC		0x08	/* position independent code */
>  #define	MA_READ		0x04	/* readable by the traced process */

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-- 
NULL && (void)