ldube opened a new pull request, #19854:
URL: https://github.com/apache/nuttx/pull/19854
## Summary
For kernel builds where CONFIG_ARCH_TEXT_VBASE is set to 0, allow a NULL
buffer in file_readv() to prevent ELF binary loading failures for binaries
located at address 0.
This fix was originally introduced in #18830, but was inadvertently reverted
by someone unaware that platforms with CONFIG_ARCH_TEXT_VBASE equal to 0 cannot
function at all without it. This commit restores the necessary check to prevent
regressions in zero-based text kernel configurations.
## Impact
Most platforms remain completely unaffected since only about 5 boards
utilize a text virtual base of zero.
The change is intended to be a noop for most platforms.
## Testing
Before this change the following errors are seen before a crash dump:
```
[ 0.000000] libelf_read: ERROR: Read from offset 56 failed: 14
[ 0.010000] libelf_loadfile: ERROR: Failed to read section 1: -14
[ 0.010000] libelf_load_with_addrenv: ERROR: libelf_loadfile failed: -14
[ 0.020000] elf_loadbinary: Failed to load ELF program binary: -14
[ 0.030000] exec_internal: ERROR: Failed to load program '/bin/init': -14
[ 0.030000] dump_assert_info: Current Version: NuttX 13.0.0
35354473c6-dirty Aug 14 2026 16:41:52 a
rm
[ 0.030000] dump_assert_info: Assertion failed : at file:
init/nx_bringup.c:389 task: AppBringUp pro
cess: Kernel 0x80301b71
```
The following objdump shows that the _/bin/init_ text is to loaded at 0
```
$ arm-none-eabi-objdump -h init
init: file format elf32-littlearm
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 0000abc4 00000000 00000000 00000038 2**3
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .rodata 0000336c 0000abc8 0000abc8 0000ac00 2**3
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
2 .ARM.extab 00000000 00000000 00000000 0000df6c 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .ARM.exidx 00000008 00000000 00000000 0000df6c 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
4 .data 0000026c 00000008 00000008 0000df74 2**2
CONTENTS, ALLOC, LOAD, RELOC, DATA
5 .init_array 00000000 00000274 00000274 0000e1e0 2**0
CONTENTS, ALLOC, LOAD, DATA
6 .fini_array 00000000 00000274 00000274 0000e1e0 2**0
CONTENTS, ALLOC, LOAD, DATA
7 .bss 00000540 00000274 00000274 0000e1e0 2**2
ALLOC
8 .comment 00001e2a 00000000 00000000 0000e1e0 2**0
CONTENTS, READONLY
9 .ARM.attributes 00000037 00000000 00000000 0001000a 2**0
CONTENTS, READONLY
```
After this change the nuttx image runs successfully.
NuttShell (NSH) NuttX-13.0.0
knsh> uname -a
NuttX 13.0.0 06530d6d17-dirty Aug 14 2026 22:39:25 arm beaglebone-black
knsh> ls /bin
/bin:
dd
getprime
hello
init
sh
knsh> /bin/hello
Hello, World!!
knsh>
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