public inbox for glibc-cvs@sourceware.org help / color / mirror / Atom feed
From: Samuel Thibault <sthibaul@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] hurd: Avoid overzealous shared objects constraints Date: Fri, 31 Dec 2021 17:23:05 +0000 (GMT) [thread overview] Message-ID: <20211231172305.596933858D39@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8c0727af63198661c0ae3641a9d66609021754a7 commit 8c0727af63198661c0ae3641a9d66609021754a7 Author: Samuel Thibault <samuel.thibault@ens-lyon.org> Date: Fri Dec 31 18:17:40 2021 +0100 hurd: Avoid overzealous shared objects constraints 407765e9f24f ("hurd: Fix ELF_MACHINE_USER_ADDRESS_MASK value") switched ELF_MACHINE_USER_ADDRESS_MASK from 0xf8000000UL to 0xf0000000UL to let libraries etc. get loaded at 0x08000000. But ELF_MACHINE_USER_ADDRESS_MASK is actually only meaningful for the main program anyway, so keep it at 0xf8000000UL to prevent the program loader from putting ld.so beyond 0x08000000. And conversely, drop the use of ELF_MACHINE_USER_ADDRESS_MASK for shared objects, which don't need any constraints since the program will have already be loaded by then. Diff: --- sysdeps/i386/dl-machine.h | 2 +- sysdeps/mach/hurd/dl-sysdep.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h index 2f0dbc27a9..b5a5dd0983 100644 --- a/sysdeps/i386/dl-machine.h +++ b/sysdeps/i386/dl-machine.h @@ -117,7 +117,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], /* Mask identifying addresses reserved for the user program, where the dynamic linker should not map anything. */ -#define ELF_MACHINE_USER_ADDRESS_MASK 0xf0000000UL +#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL /* Initial entry point code for the dynamic linker. The C function `_dl_start' is the real entry point; diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c index 968a58f668..b1a151abc1 100644 --- a/sysdeps/mach/hurd/dl-sysdep.c +++ b/sysdeps/mach/hurd/dl-sysdep.c @@ -476,7 +476,7 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) mapaddr = (vm_address_t) addr; err = __vm_map (__mach_task_self (), - &mapaddr, (vm_size_t) len, ELF_MACHINE_USER_ADDRESS_MASK, + &mapaddr, (vm_size_t) len, 0, !(flags & MAP_FIXED), memobj_rd, (vm_offset_t) offset, @@ -491,7 +491,7 @@ __mmap (void *addr, size_t len, int prot, int flags, int fd, off_t offset) if (! err) err = __vm_map (__mach_task_self (), &mapaddr, (vm_size_t) len, - ELF_MACHINE_USER_ADDRESS_MASK, + 0, !(flags & MAP_FIXED), memobj_rd, (vm_offset_t) offset, flags & (MAP_COPY|MAP_PRIVATE),
reply other threads:[~2021-12-31 17:23 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20211231172305.596933858D39@sourceware.org \ --to=sthibaul@sourceware.org \ --cc=glibc-cvs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).