MFH @ r323558.

Handle relocations for newer non-PIC MIPS ABI.

Newer binutils supports extensions to the MIPS ABI for non-PIC code
that is used when compiling O32 binaries with clang 5 (but not used
for N64 oddly e

Handle relocations for newer non-PIC MIPS ABI.

Newer binutils supports extensions to the MIPS ABI for non-PIC code
that is used when compiling O32 binaries with clang 5 (but not used
for N64 oddly enough). These extensions require support for
R_MIPS_COPY relocations as well as a second PLT GOT using
R_MIPS_JUMP_SLOT relocations.

For R_MIPS_COPY, use the same approach as on other architectures where
fixups are deferred to the MD do_copy_relocations.

The additional PLT GOT for jump slots is located in a .got.plt section
which is identified by a DT_MIPS_PLTGOT dynamic entry. This GOT also
requires fixups for the first two GOT entries just as the normal GOT.
However, the entry point for this second GOT uses a different calling
convention. Rather than passing an offset into the GOT, it passes an
offset into the .rel.plt section. This requires a second entry point
(_rtld_pltbind_start) which calls the normal _rtld_bind() rather than
_mips_rtld_bind(). This also means providing a real version of
reloc_jmpslot() which is used by _rtld_bind().

In addition, add real implementions of reloc_plt() and
reloc_jmpslots() which walk .rel.plt handling R_MIPS_JUMP_SLOT
relocations.

Reviewed by: kib
Sponsored by: DARPA / AFRL
Differential Revision: https://reviews.freebsd.org/D12326

show more ...

MFhead@r323343

Read max_stack_flags from correct object.

'obj' is not initialized here.

Reviewed by: kib
MFC after: 1 week
Sponsored by: DARPA / AFRL

MFhead@r322451

Merge ^/head r321383 through r322397.

o Replace __riscv__ with __riscv
o Replace __riscv64 with (__riscv && __riscv_xlen == 64)

This is required to support new GCC 7.1 compiler.
This is compatible with current GCC 6.1 compiler.

RISC-V

o Replace __riscv__ with __riscv
o Replace __riscv64 with (__riscv && __riscv_xlen == 64)

This is required to support new GCC 7.1 compiler.
This is compatible with current GCC 6.1 compiler.

RISC-V is extensible ISA and the idea here is to have built-in define
per each extension, so together with __riscv we will have some subset
of these as well (depending on -march string passed to compiler):

__riscv_compressed
__riscv_atomic
__riscv_mul
__riscv_div
__riscv_muldiv
__riscv_fdiv
__riscv_fsqrt
__riscv_float_abi_soft
__riscv_float_abi_single
__riscv_float_abi_double
__riscv_cmodel_medlow
__riscv_cmodel_medany
__riscv_cmodel_pic
__riscv_xlen

Reviewed by: ngie
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D11901

show more ...

MFhead@r321829

MFhead@r321755

Allow to specify targets by absolute paths in libmap.conf.

Submitted by: Tatu Kilappa <tatu.kilappa@iki.fi>
PR: 221032
MFC after: 2 weeks

MFhead@r320180

Merge ^/head r319973 through 321382.

Merge ^/head r320573 through r320970.

In open_binary_fd: when using buffer size for strl* and snprintf,
always use >= instead of > to avoid truncation.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D11474
MFC after

In open_binary_fd: when using buffer size for strl* and snprintf,
always use >= instead of > to avoid truncation.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D11474
MFC after: 3 days

show more ...

When reporting undefined symbol, note the version, if specified.

Use the standard syntax of name@version, I do not expect a confusion
due to unlikely possibility of the name containing the '@' chara

When reporting undefined symbol, note the version, if specified.

Use the standard syntax of name@version, I do not expect a confusion
due to unlikely possibility of the name containing the '@' character.

Requested by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

show more ...

Merge ^/head r318658 through r318963.

For ld.so direct execution mode, implement -p option: search for the
binary in $PATH.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D10790

Merge ^/head r318380 through r318559.

Update my copyright, note The FreeBSD Foundation involvement.
While tweaking copyright block, switch to use __FBSDID for tag.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

Fix style [1], add static keyword before static function definition.

Noted by: bapt [1]
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

Allow rtld direct-exec to take a file descriptor.

When executing rtld directly, allow a file descriptor to be explicitly
specified rather than opened from the given path. This, together with the
LD_

Allow rtld direct-exec to take a file descriptor.

When executing rtld directly, allow a file descriptor to be explicitly
specified rather than opened from the given path. This, together with the
LD_LIBRARY_PATH_FDS environment variable, allows dynamically-linked
applications to be executed from within capability mode.

Also add some rudimentary argument parsing (without pulling in getopt or
the like) to accept this file descriptor, a help (-h) option and a basic
usage string.

Reviewed by: kib
Sponsored by: NSERC, RDC
Differential Revision: https://reviews.freebsd.org/D10751

show more ...

Merge ^/head r317971 through r318379.

Pretend that there is some security when executing in direct mode.

Do not allow direct exec if we the process is suid. Try to follow Unix
permission checks for DACs, ignore ACLs.

Reviewed by: emast

Pretend that there is some security when executing in direct mode.

Do not allow direct exec if we the process is suid. Try to follow Unix
permission checks for DACs, ignore ACLs.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D10750

show more ...

Rename rtld's parse_libdir to parse_integer.

This is a more accurate name, as the integer doesn't have to be a library
directory descriptor. It is also a prerequisite for more argument parsing
comin

Rename rtld's parse_libdir to parse_integer.

This is a more accurate name, as the integer doesn't have to be a library
directory descriptor. It is also a prerequisite for more argument parsing
coming in the near future (e.g., parsing explicit binary descriptors).

Reviewed by: kib
MFC after: 2 weeks
Sponsored by: NSERC

show more ...

Make ld-elf.so.1 directly executable.

Check if passed phdr is actually phdr of the interpreter itself, and
decide that this is the case of direct execution. In this case, the
binary to activate is

Make ld-elf.so.1 directly executable.

Check if passed phdr is actually phdr of the interpreter itself, and
decide that this is the case of direct execution. In this case, the
binary to activate is specified in the argv[1]. After opening it,
shift down on-stack structure with argv, env and aux vectors to
emulate execution of the binary and not of the interpreter.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D10701

show more ...