[Crash-utility] [PATCH] Support module memory layout change on linux 6.18 by kernel commit b4760ff ("module: deprecate usage of *_gpl sections in module loader")[1]. Without the patch, crash cannot start a session with an error message like this:

From: yangshiguang <yangshiguang(a)xiaomi.com&gt; crash: invalid structure member offset: module_num_gpl_syms FILE: kernel.c LINE: 3834 FUNCTION: module_init() [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?... Signed-off-by: yangshiguang <yangshiguang(a)xiaomi.com&gt; --- kernel.c | 5 +++-- symbols.c | 18 ++++++++++++++---- 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/kernel.c b/kernel.c index 8781d6a..786eb73 100644 --- a/kernel.c +++ b/kernel.c @@ -3830,8 +3830,9 @@ module_init(void) nsyms = UINT(modbuf + OFFSET(module_nsyms)); break; case KMOD_V2: - nsyms = UINT(modbuf + OFFSET(module_num_syms)) + - UINT(modbuf + OFFSET(module_num_gpl_syms)); + nsyms = UINT(modbuf + OFFSET(module_num_syms)); + if (VALID_MEMBER(module_num_gpl_syms)) + nsyms += UINT(modbuf + OFFSET(module_num_gpl_syms)); break; } diff --git a/symbols.c b/symbols.c index e6865ca..189fe3e 100644 --- a/symbols.c +++ b/symbols.c @@ -1976,9 +1976,14 @@ store_module_symbols_6_4(ulong total, int mods_installed) "module buffer", FAULT_ON_ERROR); syms = ULONG(modbuf + OFFSET(module_syms)); - gpl_syms = ULONG(modbuf + OFFSET(module_gpl_syms)); nsyms = UINT(modbuf + OFFSET(module_num_syms)); - ngplsyms = UINT(modbuf + OFFSET(module_num_gpl_syms)); + if (VALID_MEMBER(module_gpl_syms) && VALID_MEMBER(module_num_gpl_syms)) { + gpl_syms = ULONG(modbuf + OFFSET(module_gpl_syms)); + ngplsyms = UINT(modbuf + OFFSET(module_num_gpl_syms)); + } else { + gpl_syms = 0; + ngplsyms = 0; + } nksyms = UINT(modbuf + OFFSET(module_num_symtab)); @@ -2336,9 +2341,14 @@ store_module_symbols_v2(ulong total, int mods_installed) "module buffer", FAULT_ON_ERROR); syms = ULONG(modbuf + OFFSET(module_syms)); - gpl_syms = ULONG(modbuf + OFFSET(module_gpl_syms)); nsyms = UINT(modbuf + OFFSET(module_num_syms)); - ngplsyms = UINT(modbuf + OFFSET(module_num_gpl_syms)); + if (VALID_MEMBER(module_gpl_syms) && VALID_MEMBER(module_num_gpl_syms)) { + gpl_syms = ULONG(modbuf + OFFSET(module_gpl_syms)); + ngplsyms = UINT(modbuf + OFFSET(module_num_gpl_syms)); + } else { + gpl_syms = 0; + ngplsyms = 0; + } if (THIS_KERNEL_VERSION >= LINUX(2,6,27)) { nksyms = UINT(modbuf + OFFSET(module_num_symtab)); -- 2.43.0