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build_id_find_nhdr_for_addr() fails to find the build-id if the first LOAD
segment has a virtual address other than 0x0.
For most shared libraries, the first LOAD segment has vaddr=0x0:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x00000000 0x00000000 0x2d2e26 0x2d2e26 R E 0x1000
LOAD 0x2d2e54 0x002d3e54 0x002d3e54 0x2e248 0x2f148 RW 0x1000
However, compiling the Intel Vulkan driver as 32-bit binary on Android produces
the following ELF header with vaddr=0x8000 instead:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x00008034 0x00008034 0x00100 0x00100 R 0x4
LOAD 0x000000 0x00008000 0x00008000 0x224a04 0x224a04 R E 0x1000
LOAD 0x225710 0x0022e710 0x0022e710 0x25988 0x27364 RW 0x1000
build_id_find_nhdr_callback() compares the address of dli_fbase from dladdr()
and dlpi_addr from dl_iterate_phdr(). With vaddr > 0, these point to a
different memory address, e.g.:
dli_fbase=0xd8395000 (offset 0x8000)
dlpi_addr=0xd838d000
At least on glibc and bionic (Android) dli_fbase refers to the address where
the shared object is mapped into the process space, whereas dlpi_addr is just
the base address for the vaddrs declared in the ELF header.
To compare them correctly, we need to calculate the start of the mapping
by adding the vaddr of the first LOAD segment to the base address.
Note: musl users will need the following patch.
https://git.musl-libc.org/cgit/musl/commit/?id=b3ae7beabb9f0c219bb8a8b63567a01c6530c1ac
Cc: Chad Versace <[email protected]>
Cc: <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104642
Fixes: 5c98d38 "util: Query build-id by symbol address, not library name"
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>
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Fix the build for Android Nougat.
The dladdr(3) manpage says that <dlfcn.h> is required. On Linux, the
build succeeded without it because build_id.c includes <link.h> which
includes <dlfcn.h>. On Android, we must include <dlfcn.h> directly.
Fixes: 5c98d382 "util: Query build-id by symbol address, not library name"
Reviewed-by: Matt Turner <[email protected]>
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This patch renames build_id_find_nhdr() to
build_id_find_nhdr_for_addr(), and changes it to never examine the
library name.
Tested on Fedora by confirming that build_id_get_data() returns the same
build-id as the file(1) tool. For BSD, I confirmed that the API used
(dladdr() and struct Dl_info) is documented in FreeBSD's manpages.
This solves two problems:
- We can now the query the build-id without knowing the installed library's
filename.
This matters because Android requires specific filenames for HAL
modules, such as "/vendor/lib/hw/vulkan.${board}.so". The HAL
filenames do not follow the Unix convention of "libfoo.so". In
other words, the same query code will now work on Linux and Android.
- Querying the build-id now works correctly when the process
contains multiple shared objects with the same basename.
(Admittedly, this is a highly unlikely scenario).
Cc: Jonathan Gray <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
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According to dl_iterate_phdr man page first object visited is the
main program where dlpi_name is an empty string. This fixes segfault
on Android when using build-id as identifier.
Fixes: d4fa083e11f ("util: Add utility build-id code.")
Signed-off-by: Tapani Pälli <[email protected]>
Reviewed-by: Plamena Manolova <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
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We're about to use the build-id as the starting point for another SHA1
hash in the Intel Vulkan driver, and returning a pointer is far more
convenient.
Reviewed-by: Chad Versace <[email protected]>
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Define ElfW() and NT_GNU_BUILD_ID if needed as these defines are not
present on at least OpenBSD and FreeBSD. Fixes the build on OpenBSD.
Fixes: d4fa083e11f ("util: Add utility build-id code.")
Signed-off-by: Jonathan Gray <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
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Provides the ability to read the .note.gnu.build-id section of ELF
binaries, which is inserted by the --build-id=... flag to ld.
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Chad Versace <[email protected]>
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