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Fix the AT_EXECFD functionality.

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If the mapped object is linked at specific address, we must obey it.
If AT_EXECFD is not used, only in-kernel ELF image activator needed to
keep the mapping address, since only binaries are linked at the fixed
address, and binaries are mapped by kernel in this case.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
X-Differential revision:	https://reviews.freebsd.org/D10701
This commit is contained in:
Konstantin Belousov 2017-05-15 18:47:25 +00:00
parent 3f1466a535
commit 9104191924
1 changed files with 2 additions and 0 deletions
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2
libexec/rtld-elf/map_object.c
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@ -193,6 +193,8 @@ map_object(int fd, const char *path, const struct stat *sb)
base_flags = MAP_PRIVATE | MAP_ANON | MAP_NOCORE;
if (npagesizes > 1 && round_page(segs[0]->p_filesz) >= pagesizes[1])
base_flags |= MAP_ALIGNED_SUPER;
if (base_vaddr != 0)
base_flags |= MAP_FIXED | MAP_EXCL;
mapbase = mmap(base_addr, mapsize, PROT_NONE, base_flags, -1, 0);
if (mapbase == (caddr_t) -1) {