diff options
| author | Michael Paquier | 2023-02-08 04:09:49 +0000 |
|---|---|---|
| committer | Michael Paquier | 2023-02-08 04:09:49 +0000 |
| commit | 1e4fda6da918f734dd6dab67b3ddcaba4c2fecb2 (patch) | |
| tree | 676e861d3a3e41ead044d1401345a00242dc8777 /src/common/exec.c | |
| parent | 20aba55fae83cd0b6f7511365d172da8cd7e0135 (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.
This has been originally applied as of f3e7806 for v15~, but
recently-added buildfarm member gokiburi tests this configuration on
older branches as well, causing it to fail randomly as ASLR would be
enabled.
Suggested-by: Andres Freund <andres@anarazel.de>
Tested-by: Bossart, Nathan <bossartn@amazon.com>
Discussion: https://postgr.es/m/20210806032944.m4tz7j2w47mant26%40alap3.anarazel.de
Backpatch-through: 12
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 8f1147b68a0..7f0142fb475 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 + /* Inhibit mingw CRT's auto-globbing of command line arguments */ #if defined(WIN32) && !defined(_MSC_VER) extern int _CRT_glob = 0; /* 0 turns off globbing; 1 turns it on */ @@ -492,6 +500,31 @@ 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 /* |