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fbsd nat: Disable address space randomization when requested.

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Use procctl(2) with PROC_ASLR_CTL to disable address space
randomization in the current gdb process before forking a child
process for a new inferior when address space randomization is
disabled.

gdb/ChangeLog:

	* configure.ac: Check for <sys/procctl.h>.
	* config.in, configure: Regenerate.
	* fbsd-nat.c: Include <sys/procctl.h> if present.
	[PROC_ASLR_CTL] (maybe_disable_address_space_randomization): New.
	(fbsd_nat_target::create_inferior)
	(fbsd_nat_target::supports_disable_randomization): New.
	* fbsd-nat.h (fbsd_nat_target::create_inferior)
	(fbsd_nat_target::supports_disable_randomization): New.
This commit is contained in:
John Baldwin
2021-06-14 14:28:26 -07:00
parent c9923e71ff
commit 09db4332c6
6 changed files with 96 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

75
gdb/fbsd-nat.c
View File

@@ -29,6 +29,9 @@
#include "gdbsupport/gdb_wait.h"
#include "inf-ptrace.h"
#include <sys/types.h>
#ifdef HAVE_SYS_PROCCTL_H
#include <sys/procctl.h>
#endif
#include <sys/procfs.h>
#include <sys/ptrace.h>
#include <sys/signal.h>
@@ -1401,6 +1404,68 @@ fbsd_nat_target::supports_stopped_by_sw_breakpoint ()
}
#endif
#ifdef PROC_ASLR_CTL
class maybe_disable_address_space_randomization
{
public:
explicit maybe_disable_address_space_randomization (bool disable_randomization)
{
if (disable_randomization)
{
if (procctl (P_PID, getpid (), PROC_ASLR_STATUS, &m_aslr_ctl) == -1)
{
warning (_("Failed to fetch current address space randomization "
"status: %s"), safe_strerror (errno));
return;
}
m_aslr_ctl &= ~PROC_ASLR_ACTIVE;
if (m_aslr_ctl == PROC_ASLR_FORCE_DISABLE)
return;
int ctl = PROC_ASLR_FORCE_DISABLE;
if (procctl (P_PID, getpid (), PROC_ASLR_CTL, &ctl) == -1)
{
warning (_("Error disabling address space randomization: %s"),
safe_strerror (errno));
return;
}
m_aslr_ctl_set = true;
}
}
~maybe_disable_address_space_randomization ()
{
if (m_aslr_ctl_set)
{
if (procctl (P_PID, getpid (), PROC_ASLR_CTL, &m_aslr_ctl) == -1)
warning (_("Error restoring address space randomization: %s"),
safe_strerror (errno));
}
}
DISABLE_COPY_AND_ASSIGN (maybe_disable_address_space_randomization);
private:
bool m_aslr_ctl_set = false;
int m_aslr_ctl = 0;
};
#endif
void
fbsd_nat_target::create_inferior (const char *exec_file,
const std::string &allargs,
char **env, int from_tty)
{
#ifdef PROC_ASLR_CTL
maybe_disable_address_space_randomization restore_aslr_ctl
(disable_randomization);
#endif
inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty);
}
#ifdef TDP_RFPPWAIT
/* Target hook for follow_fork. On entry and at return inferior_ptid is
the ptid of the followed inferior. */
@@ -1526,6 +1591,16 @@ fbsd_nat_target::supports_multi_process ()
return true;
}
bool
fbsd_nat_target::supports_disable_randomization ()
{
#ifdef PROC_ASLR_CTL
return true;
#else
return false;
#endif
}
void _initialize_fbsd_nat ();
void
_initialize_fbsd_nat ()