In case linux banner can not be found in vmlinux for some reason. The fallback checking of "Linux version" failed for kernel 7.x with below error msg: WARNING: kernel version inconsistency between vmlinux and dumpfile crash: incompatible arguments: vmlinux is not SMP -- vmcore is SMP Jiri's case is OpenSUSE uses separate vmlinux.debug file, details see https://github.com/crash-utility/crash/issues/232 But update the kernel version number in kernel sanity checking code does workaround the issue. Let's fix this separately. A few improvements to the sanity checking including: - Replace hardcoded version checks (2.x through 6.x) with a unified kernel_version_str_sanity_check() function - Extend support to Linux 7.x kernels - Add proper bounds checking and null pointer validation - Ensure minor version number is numeric for stricter validation - Reduce code duplication in verify_namelist() and debug_kernel_version() Reported-by: Jiri Slaby <jirislaby(a)gmail.com&gt; Signed-off-by: Dave Young <yangrr.2009(a)tsinghua.org.cn&gt; --- [V1->V2]: refactore the code; address comments from Mukesh kernel.c | 39 +++++++++++++++++++++++++++++---------- 1 file changed, 29 insertions(+), 10 deletions(-) Index: crash/kernel.c =================================================================== --- crash.orig/kernel.c 2026-08-14 11:21:39.972971968 +0800 +++ crash/kernel.c 2026-08-14 11:21:42.371976057 +0800 @@ -29,6 +29,9 @@ #endif #include "bfd.h" +#define KERNEL_VERSION_MIN '2' +#define KERNEL_VERSION_MAX '7' /* latest linux mainline kernel major number */ + static void do_module_cmd(ulong, char *, ulong, char *, char *); static void show_module_taint(void); static char *find_module_objfile(char *, char *, char *); @@ -104,6 +107,30 @@ static int is_pvops_xen(void); static int get_linux_banner_from_vmlinux(char *, size_t); +static bool kernel_version_str_sanity_check(char *buf) +{ + int n; + char *p; + + if (!buf) + return FALSE; + + p = strstr(buf, "Linux version "); + if (!p) + return FALSE; + + n = strlen(p); + + if (n < 17) /* "Linux version " (14) + "x.y" (3) = 17 */ + return FALSE; + + if (p[14] >= KERNEL_VERSION_MIN && p[14] <= KERNEL_VERSION_MAX + && p[15] == '.' && p[16] >= '0' && p[16] <= '9') + return TRUE; + + return FALSE; +} + /* * popuplate the global kernel table (kt) with kernel version * information parsed from UTSNAME/OSRELEASE string @@ -1396,11 +1423,7 @@ found = FALSE; sprintf(buffer3, "(unknown)"); while (fgets(buffer, (BUFSIZE/2)-1, pipe)) { - if (!strstr(buffer, "Linux version 2.") && - !strstr(buffer, "Linux version 3.") && - !strstr(buffer, "Linux version 4.") && - !strstr(buffer, "Linux version 5.") && - !strstr(buffer, "Linux version 6.")) + if (!kernel_version_str_sanity_check(buffer)) continue; if (strstr(buffer, kt->proc_version)) { @@ -5987,11 +6010,7 @@ argc = 0; while (fgets(buf, BUFSIZE-1, pipe)) { - if (!strstr(buf, "Linux version 2.") && - !strstr(buf, "Linux version 3.") && - !strstr(buf, "Linux version 4.") && - !strstr(buf, "Linux version 5.") && - !strstr(buf, "Linux version 6.")) + if (!kernel_version_str_sanity_check(buf)) continue; argc = parse_line(buf, arglist);