Integrated: 8366092: [GCC static analyzer] UnixOperatingSystem.c warning: use of uninitialized value 'systemTicks'

[Matthias Baesken]

On Wed, 27 Aug 2025 14:23:35 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> When using gcc static analyzer (-fanalyzer) with gcc 13.2 the following issue is reported :
> 
> /jdk/src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c: In function 'get_jvmticks':
> /jdk/src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c:208:24: warning: use of uninitialized value 'systemTicks' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
>   208 | pticks->usedKernel = systemTicks;
> 
> 
> vsscanf usually/normally reads the systemTicks info from /proc file system. see
> https://github.com/openjdk/jdk/blob/45726a1f8b8f76586037867a32b82f8ab9b96937/src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c#L163
> but we never check that the *exact* number of params is read with vsscanf :
> n = vsscanf(tmp, fmt, args);
> So potentially we could get a non complete info without systemTicks and the call would still succeed.

This pull request has now been integrated.

Changeset: a6e2a329
Author:    Matthias Baesken <mbaesken at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a6e2a329a07c71582ac696809fb5349c6a0b681c
Stats:     2 lines in 1 file changed: 0 ins; 0 del; 2 mod

8366092: [GCC static analyzer] UnixOperatingSystem.c warning: use of uninitialized value 'systemTicks'

Reviewed-by: kevinw, asteiner

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PR: https://git.openjdk.org/jdk/pull/26962