Date: Tue, 19 May 2015 16:23:47 +0000 (UTC) From: Alan Somers <asomers@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r283115 - head/sys/kern Message-ID: <201505191623.t4JGNllP039557@svn.freebsd.org>
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Author: asomers Date: Tue May 19 16:23:47 2015 New Revision: 283115 URL: https://svnweb.freebsd.org/changeset/base/283115 Log: Properly null-terminate strings in a kernel dump header. A version string longer than 192 bytes will cause the version field of a dump header to overflow. strncpy doesn't null terminate it, so savecore will print a corrupted info file. Using strlcpy fixes the bug. Differential Revision: https://reviews.freebsd.org/D2560 Reviewed by: markj MFC after: 3 weeks Sponsored by: Spectra Logic Modified: head/sys/kern/kern_shutdown.c Modified: head/sys/kern/kern_shutdown.c ============================================================================== --- head/sys/kern/kern_shutdown.c Tue May 19 15:43:20 2015 (r283114) +++ head/sys/kern/kern_shutdown.c Tue May 19 16:23:47 2015 (r283115) @@ -873,16 +873,16 @@ mkdumpheader(struct kerneldumpheader *kd { bzero(kdh, sizeof(*kdh)); - strncpy(kdh->magic, magic, sizeof(kdh->magic)); - strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); + strlcpy(kdh->magic, magic, sizeof(kdh->magic)); + strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); kdh->version = htod32(KERNELDUMPVERSION); kdh->architectureversion = htod32(archver); kdh->dumplength = htod64(dumplen); kdh->dumptime = htod64(time_second); kdh->blocksize = htod32(blksz); - strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); - strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); + strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); + strlcpy(kdh->versionstring, version, sizeof(kdh->versionstring)); if (panicstr != NULL) - strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); + strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); kdh->parity = kerneldump_parity(kdh); }
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