diff options
| author | Thomas Munro | 2022-01-10 10:54:11 +0000 |
|---|---|---|
| committer | Thomas Munro | 2022-01-10 11:04:33 +0000 |
| commit | f3e78069db7f7a753ebfe1010b810e47e0d2aa9a (patch) | |
| tree | 87b4da09ae69dfbcbd47d65c206cfd0a2fe88335 /src/common/exec.c | |
| parent | ee419607381dd9a8031f2bc226c742a3289b7f33 (diff) | |
Make EXEC_BACKEND more convenient on Linux and FreeBSD.
Try to disable ASLR when building in EXEC_BACKEND mode, to avoid random
memory mapping failures while testing. For developer use only, no
effect on regular builds.
Suggested-by: Andres Freund <andres@anarazel.de>
Tested-by: Bossart, Nathan <bossartn@amazon.com>
Discussion: https://postgr.es/m/20210806032944.m4tz7j2w47mant26%40alap3.anarazel.de
Diffstat (limited to 'src/common/exec.c')
| -rw-r--r-- | src/common/exec.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/common/exec.c b/src/common/exec.c index 9428b7393c2..95ef13c322d 100644 --- a/src/common/exec.c +++ b/src/common/exec.c @@ -25,6 +25,14 @@ #include <sys/wait.h> #include <unistd.h> +#ifdef EXEC_BACKEND +#if defined(HAVE_SYS_PERSONALITY_H) +#include <sys/personality.h> +#elif defined(HAVE_SYS_PROCCTL_H) +#include <sys/procctl.h> +#endif +#endif + /* * Hacky solution to allow expressing both frontend and backend error reports * in one macro call. First argument of log_error is an errcode() call of @@ -470,6 +478,31 @@ set_pglocale_pgservice(const char *argv0, const char *app) } } +#ifdef EXEC_BACKEND +/* + * For the benefit of PostgreSQL developers testing EXEC_BACKEND on Unix + * systems (code paths normally exercised only on Windows), provide a way to + * disable address space layout randomization, if we know how on this platform. + * Otherwise, backends may fail to attach to shared memory at the fixed address + * chosen by the postmaster. (See also the macOS-specific hack in + * sysv_shmem.c.) + */ +int +pg_disable_aslr(void) +{ +#if defined(HAVE_SYS_PERSONALITY_H) + return personality(ADDR_NO_RANDOMIZE); +#elif defined(HAVE_SYS_PROCCTL_H) && defined(PROC_ASLR_FORCE_DISABLE) + int data = PROC_ASLR_FORCE_DISABLE; + + return procctl(P_PID, 0, PROC_ASLR_CTL, &data); +#else + errno = ENOSYS; + return -1; +#endif +} +#endif + #ifdef WIN32 /* |