diff options
| author | kib <kib@FreeBSD.org> | 2011-01-08 17:13:43 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2011-01-08 17:13:43 +0000 |
| commit | 6e23841922a5006f49524e7833864f5505466fa0 (patch) | |
| tree | 2bd624efb926ca1e72001fb3dbd4e1c9b451136e /lib/libc/gen/elf_utils.c | |
| parent | 5cec74bed917b7e7fe4e854d8ee69bbc3a117817 (diff) | |
| download | FreeBSD-src-6e23841922a5006f49524e7833864f5505466fa0.zip FreeBSD-src-6e23841922a5006f49524e7833864f5505466fa0.tar.gz | |
Implement __pthread_map_stacks_exec() callback for libc, to change the
stack protection to allow execution for single-threaded processes.
Diffstat (limited to 'lib/libc/gen/elf_utils.c')
| -rw-r--r-- | lib/libc/gen/elf_utils.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/libc/gen/elf_utils.c b/lib/libc/gen/elf_utils.c index 9ee5f41..7bd7511 100644 --- a/lib/libc/gen/elf_utils.c +++ b/lib/libc/gen/elf_utils.c @@ -26,7 +26,12 @@ * $FreeBSD$ */ +#include <sys/types.h> +#include <sys/mman.h> +#include <sys/resource.h> +#include <sys/sysctl.h> #include <link.h> +#include <stddef.h> int __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr) @@ -45,3 +50,25 @@ __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr) } return (i != phdr_info->dlpi_phnum); } + +#pragma weak __pthread_map_stacks_exec +void +__pthread_map_stacks_exec(void) +{ + int mib[2]; + struct rlimit rlim; + u_long usrstack; + size_t len; + + mib[0] = CTL_KERN; + mib[1] = KERN_USRSTACK; + len = sizeof(usrstack); + if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0) + == -1) + return; + if (getrlimit(RLIMIT_STACK, &rlim) == -1) + return; + mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur), + rlim.rlim_cur, _rtld_get_stack_prot()); +} + |
