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libpmc: pmc_init() should avoid overflowing pmc_class_table

Browse source 
Use calloc().

Walk the class list we get from kernel, so we will not add something
the kernel does not know about.

Avoid picking headers from /usr/include.

Differential Revision:	https://reviews.freebsd.org/D36401
This commit is contained in:
Toomas Soome 2022-08-31 11:09:18 +03:00
parent 69413598d2
commit 1f5679569d
2 changed files with 88 additions and 22 deletions
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2
lib/libpmc/Makefile
View file

@ -43,7 +43,7 @@ SRCS+= libpmc_events.c
WARNS?= 3
CFLAGS+= -I${.CURDIR}
CFLAGS+= -I${.CURDIR} -I${SRCTOP}/sys
CWARNFLAGS.gcc+= -Wno-shadow -Wno-cast-align
# Silence warnings about usage of deprecated std::auto_ptr

108
lib/libpmc/libpmc.c
View file

@ -1440,15 +1440,12 @@ pmc_init(void)
memcpy(&cpu_info.pm_classes[n], &op_cpu_info.pm_classes[n],
sizeof(cpu_info.pm_classes[n]));
pmc_class_table = malloc(PMC_CLASS_TABLE_SIZE *
pmc_class_table = calloc(PMC_CLASS_TABLE_SIZE,
sizeof(struct pmc_class_descr *));
if (pmc_class_table == NULL)
return (-1);
for (n = 0; n < PMC_CLASS_TABLE_SIZE; n++)
pmc_class_table[n] = NULL;
/*
* Get soft events list.
*/
@ -1472,20 +1469,98 @@ pmc_init(void)
* Fill in the class table.
*/
n = 0;
for (unsigned i = 0; i < PMC_CLASS_TABLE_SIZE; i++) {
switch (cpu_info.pm_classes[i].pm_class) {
#if defined(__amd64__) || defined(__i386__)
case PMC_CLASS_TSC:
pmc_class_table[n++] = &tsc_class_table_descr;
break;
/* Fill soft events information. */
pmc_class_table[n++] = &soft_class_table_descr;
case PMC_CLASS_K8:
pmc_class_table[n++] = &k8_class_table_descr;
break;
#endif
case PMC_CLASS_SOFT:
pmc_class_table[n++] = &soft_class_table_descr;
break;
#if defined(__arm__)
case PMC_CLASS_ARMV7:
switch (cpu_info.pm_cputype) {
case PMC_CPU_ARMV7_CORTEX_A8:
pmc_class_table[n++] =
&cortex_a8_class_table_descr;
break;
case PMC_CPU_ARMV7_CORTEX_A9:
pmc_class_table[n++] =
&cortex_a9_class_table_descr;
break;
default:
errno = ENXIO;
return (pmc_syscall = -1);
}
break;
#endif
#if defined(__aarch64__)
pmc_class_table[n++] = &cmn600_pmu_class_table_descr;
pmc_class_table[n++] = &dmc620_pmu_cd2_class_table_descr;
pmc_class_table[n++] = &dmc620_pmu_c_class_table_descr;
case PMC_CLASS_ARMV8:
switch (cpu_info.pm_cputype) {
case PMC_CPU_ARMV8_CORTEX_A53:
pmc_class_table[n++] =
&cortex_a53_class_table_descr;
break;
case PMC_CPU_ARMV8_CORTEX_A57:
pmc_class_table[n++] =
&cortex_a57_class_table_descr;
break;
case PMC_CPU_ARMV8_CORTEX_A76:
pmc_class_table[n++] =
&cortex_a76_class_table_descr;
break;
default:
errno = ENXIO;
return (pmc_syscall = -1);
}
break;
case PMC_CLASS_DMC620_PMU_CD2:
pmc_class_table[n++] =
&dmc620_pmu_cd2_class_table_descr;
break;
case PMC_CLASS_DMC620_PMU_C:
pmc_class_table[n++] = &dmc620_pmu_c_class_table_descr;
break;
case PMC_CLASS_CMN600_PMU:
pmc_class_table[n++] = &cmn600_pmu_class_table_descr;
break;
#endif
#if defined(__amd64__) || defined(__i386__)
if (cpu_info.pm_cputype != PMC_CPU_GENERIC)
pmc_class_table[n++] = &tsc_class_table_descr;
#if defined(__powerpc__)
case PMC_CLASS_PPC7450:
pmc_class_table[n++] = &ppc7450_class_table_descr;
break;
case PMC_CLASS_PPC970:
pmc_class_table[n++] = &ppc970_class_table_descr;
break;
case PMC_CLASS_E500:
pmc_class_table[n++] = &e500_class_table_descr;
break;
#endif
default:
#if defined(DEBUG)
printf("pm_class: 0x%x\n",
cpu_info.pm_classes[i].pm_class);
#endif
break;
}
}
#define PMC_MDEP_INIT(C) pmc_mdep_event_aliases = C##_aliases
/* Configure the event name parser. */
@ -1493,7 +1568,6 @@ pmc_init(void)
#if defined(__amd64__) || defined(__i386__)
case PMC_CPU_AMD_K8:
PMC_MDEP_INIT(k8);
pmc_class_table[n] = &k8_class_table_descr;
break;
#endif
case PMC_CPU_GENERIC:
@ -1502,39 +1576,31 @@ pmc_init(void)
#if defined(__arm__)
case PMC_CPU_ARMV7_CORTEX_A8:
PMC_MDEP_INIT(cortex_a8);
pmc_class_table[n] = &cortex_a8_class_table_descr;
break;
case PMC_CPU_ARMV7_CORTEX_A9:
PMC_MDEP_INIT(cortex_a9);
pmc_class_table[n] = &cortex_a9_class_table_descr;
break;
#endif
#if defined(__aarch64__)
case PMC_CPU_ARMV8_CORTEX_A53:
PMC_MDEP_INIT(cortex_a53);
pmc_class_table[n] = &cortex_a53_class_table_descr;
break;
case PMC_CPU_ARMV8_CORTEX_A57:
PMC_MDEP_INIT(cortex_a57);
pmc_class_table[n] = &cortex_a57_class_table_descr;
break;
case PMC_CPU_ARMV8_CORTEX_A76:
PMC_MDEP_INIT(cortex_a76);
pmc_class_table[n] = &cortex_a76_class_table_descr;
break;
#endif
#if defined(__powerpc__)
case PMC_CPU_PPC_7450:
PMC_MDEP_INIT(ppc7450);
pmc_class_table[n] = &ppc7450_class_table_descr;
break;
case PMC_CPU_PPC_970:
PMC_MDEP_INIT(ppc970);
pmc_class_table[n] = &ppc970_class_table_descr;
break;
case PMC_CPU_PPC_E500:
PMC_MDEP_INIT(e500);
pmc_class_table[n] = &e500_class_table_descr;
break;
#endif
default: