Author: markj
Date: Mon Jan 21 18:07:02 2019
New Revision: 343265
URL: https://svnweb.freebsd.org/changeset/base/343265
Log:
hwpmc: Plug memory disclosures from PMC_OP_{GETPMCINFO,GETCPUINFO}.
admbugs: 765
Reported by: Vlad Tsyrklevich <v...@tsyrklevich.net>
MFC after: 1 day
Security: Kernel memory disclosure
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/dev/hwpmc/hwpmc_mod.c
Modified: head/sys/dev/hwpmc/hwpmc_mod.c
==============================================================================
--- head/sys/dev/hwpmc/hwpmc_mod.c Mon Jan 21 17:58:06 2019
(r343264)
+++ head/sys/dev/hwpmc/hwpmc_mod.c Mon Jan 21 18:07:02 2019
(r343265)
@@ -3512,6 +3512,7 @@ pmc_syscall_handler(struct thread *td, void *syscall_a
struct pmc_classdep *pcd;
int cl;
+ memset(&gci, 0, sizeof(gci));
gci.pm_cputype = md->pmd_cputype;
gci.pm_ncpu = pmc_cpu_max();
gci.pm_npmc = md->pmd_npmc;
@@ -3661,7 +3662,7 @@ pmc_syscall_handler(struct thread *td, void *syscall_a
npmc = md->pmd_npmc;
pmcinfo_size = npmc * sizeof(struct pmc_info);
- pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK);
+ pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK | M_ZERO);
p = pmcinfo;
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