Alexandre Courbot d7231d8cb2 scripts: modpost: detect and report truncated buf_printf() output ...

buf_printf() uses a fixed-size stack buffer. vsnprintf() returns the
number of bytes that *would* have been written to that buffer, which can
be larger than the size of said buffer if the formatted string is too
long.

The problem is that whenever this happens buf_printf() currently passes
this length, unchecked, to buf_write(), which silently reads past the
stack buffer and copies invalid data into the output buffer.

Fix this by detecting vsnprintf() failures and truncations before
appending to the output buffer, and report a fatal error instead of
producing corrupt symbol names.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260527-nova-exports-v2-1-06de4c556d55@nvidia.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

2026-05-28 09:57:13 -07:00

..

.gitignore

…

devicetable-offsets.c

mcb: Add missing modpost build support

2025-12-27 20:48:01 +01:00

empty.c

…

file2alias.c

mcb: Add missing modpost build support

2025-12-27 20:48:01 +01:00

Makefile

Makefile: remove redundant tool coverage variables

2024-05-14 23:35:48 +09:00

mk_elfconfig.c

modpost: detect endianness on run-time

2024-09-01 20:33:32 +09:00

modpost.c

scripts: modpost: detect and report truncated buf_printf() output

2026-05-28 09:57:13 -07:00

modpost.h

modpost: Create modalias for builtin modules

2025-09-24 09:10:45 -07:00

sumversion.c

modpost: use strstarts() to clean up parse_source_files()

2025-03-15 21:16:22 +09:00

symsearch.c

modpost: replace the use of NOFAIL() with xmalloc() etc.

2024-09-01 20:34:48 +09:00