Date: Tue, 23 Jan 2018 04:30:46 +0000 (UTC) From: Kristof Provost <kp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r328275 - stable/11/sys/netpfil/pf Message-ID: <201801230430.w0N4Ukku036500@repo.freebsd.org>
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Author: kp Date: Tue Jan 23 04:30:46 2018 New Revision: 328275 URL: https://svnweb.freebsd.org/changeset/base/328275 Log: MFC r327675 pf: Avoid integer overflow issues by using mallocarray() iso. malloc() pfioctl() handles several ioctl that takes variable length input, these include: - DIOCRADDTABLES - DIOCRDELTABLES - DIOCRGETTABLES - DIOCRGETTSTATS - DIOCRCLRTSTATS - DIOCRSETTFLAGS All of them take a pfioc_table struct as input from userland. One of its elements (pfrio_size) is used in a buffer length calculation. The calculation contains an integer overflow which if triggered can lead to out of bound reads and writes later on. Reported by: Ilja Van Sprundel <ivansprundel@ioactive.com> Modified: stable/11/sys/netpfil/pf/pf_ioctl.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netpfil/pf/pf_ioctl.c ============================================================================== --- stable/11/sys/netpfil/pf/pf_ioctl.c Tue Jan 23 04:01:48 2018 (r328274) +++ stable/11/sys/netpfil/pf/pf_ioctl.c Tue Jan 23 04:30:46 2018 (r328275) @@ -2524,7 +2524,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_table); - pfrts = malloc(totlen, M_TEMP, M_WAITOK); + pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table), + M_TEMP, M_WAITOK); + if (! pfrts) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfrts, totlen); if (error) { free(pfrts, M_TEMP); @@ -2548,7 +2553,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_table); - pfrts = malloc(totlen, M_TEMP, M_WAITOK); + pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table), + M_TEMP, M_WAITOK); + if (! pfrts) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfrts, totlen); if (error) { free(pfrts, M_TEMP); @@ -2572,7 +2582,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_table); - pfrts = malloc(totlen, M_TEMP, M_WAITOK); + pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table), + M_TEMP, M_WAITOK); + if (! pfrts) { + error = ENOMEM; + break; + } PF_RULES_RLOCK(); error = pfr_get_tables(&io->pfrio_table, pfrts, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); @@ -2593,7 +2608,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_tstats); - pfrtstats = malloc(totlen, M_TEMP, M_WAITOK); + pfrtstats = mallocarray(io->pfrio_size, + sizeof(struct pfr_tstats), M_TEMP, M_WAITOK); + if (! pfrtstats) { + error = ENOMEM; + break; + } PF_RULES_WLOCK(); error = pfr_get_tstats(&io->pfrio_table, pfrtstats, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); @@ -2614,7 +2634,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_table); - pfrts = malloc(totlen, M_TEMP, M_WAITOK); + pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table), + M_TEMP, M_WAITOK); + if (! pfrts) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfrts, totlen); if (error) { free(pfrts, M_TEMP); @@ -2638,7 +2663,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_table); - pfrts = malloc(totlen, M_TEMP, M_WAITOK); + pfrts = mallocarray(io->pfrio_size, sizeof(struct pfr_table), + M_TEMP, M_WAITOK); + if (! pfrts) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfrts, totlen); if (error) { free(pfrts, M_TEMP); @@ -2677,7 +2707,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2704,7 +2739,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2732,7 +2772,12 @@ DIOCCHANGEADDR_error: } count = max(io->pfrio_size, io->pfrio_size2); totlen = count * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(count, sizeof(struct pfr_addr), M_TEMP, + M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2760,7 +2805,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } PF_RULES_RLOCK(); error = pfr_get_addrs(&io->pfrio_table, pfras, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); @@ -2781,7 +2831,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_astats); - pfrastats = malloc(totlen, M_TEMP, M_WAITOK); + pfrastats = mallocarray(io->pfrio_size, + sizeof(struct pfr_astats), M_TEMP, M_WAITOK); + if (! pfrastats) { + error = ENOMEM; + break; + } PF_RULES_RLOCK(); error = pfr_get_astats(&io->pfrio_table, pfrastats, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); @@ -2802,7 +2857,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2829,7 +2889,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2856,7 +2921,12 @@ DIOCCHANGEADDR_error: break; } totlen = io->pfrio_size * sizeof(struct pfr_addr); - pfras = malloc(totlen, M_TEMP, M_WAITOK); + pfras = mallocarray(io->pfrio_size, sizeof(struct pfr_addr), + M_TEMP, M_WAITOK); + if (! pfras) { + error = ENOMEM; + break; + } error = copyin(io->pfrio_buffer, pfras, totlen); if (error) { free(pfras, M_TEMP); @@ -2898,7 +2968,12 @@ DIOCCHANGEADDR_error: break; } totlen = sizeof(struct pfioc_trans_e) * io->size; - ioes = malloc(totlen, M_TEMP, M_WAITOK); + ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e), + M_TEMP, M_WAITOK); + if (! ioes) { + error = ENOMEM; + break; + } error = copyin(io->array, ioes, totlen); if (error) { free(ioes, M_TEMP); @@ -2964,7 +3039,12 @@ DIOCCHANGEADDR_error: break; } totlen = sizeof(struct pfioc_trans_e) * io->size; - ioes = malloc(totlen, M_TEMP, M_WAITOK); + ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e), + M_TEMP, M_WAITOK); + if (! ioes) { + error = ENOMEM; + break; + } error = copyin(io->array, ioes, totlen); if (error) { free(ioes, M_TEMP); @@ -3030,7 +3110,12 @@ DIOCCHANGEADDR_error: break; } totlen = sizeof(struct pfioc_trans_e) * io->size; - ioes = malloc(totlen, M_TEMP, M_WAITOK); + ioes = mallocarray(io->size, sizeof(struct pfioc_trans_e), + M_TEMP, M_WAITOK); + if (! ioes) { + error = ENOMEM; + break; + } error = copyin(io->array, ioes, totlen); if (error) { free(ioes, M_TEMP); @@ -3231,7 +3316,12 @@ DIOCCHANGEADDR_error: } bufsiz = io->pfiio_size * sizeof(struct pfi_kif); - ifstore = malloc(bufsiz, M_TEMP, M_WAITOK); + ifstore = mallocarray(io->pfiio_size, sizeof(struct pfi_kif), + M_TEMP, M_WAITOK); + if (! ifstore) { + error = ENOMEM; + break; + } PF_RULES_RLOCK(); pfi_get_ifaces(io->pfiio_name, ifstore, &io->pfiio_size); PF_RULES_RUNLOCK();
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