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Fully initialize the required TSS fields so that the io permission

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bitmap is set correctly.

Patch from:	peter
Security:	FreeBSD-SA-05:03.amd64
This commit is contained in:
Colin Percival 2005-04-06 01:05:51 +00:00
parent a0d17f7e98
commit d0b183c937
3 changed files with 4 additions and 1 deletions
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3
sys/amd64/amd64/machdep.c
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@ -1251,6 +1251,9 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
/* doublefault stack space, runs on ist1 */
common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
/* Set the IO permission bitmap (empty due to tss seg limit) */
common_tss[0].tss_iobase = sizeof(struct amd64tss);
gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
ltr(gsel_tss);

1
sys/amd64/amd64/mp_machdep.c
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@ -379,6 +379,7 @@ init_secondary(void)
/* Init tss */
common_tss[cpu] = common_tss[0];
common_tss[cpu].tss_rsp0 = 0; /* not used until after switch */
common_tss[cpu].tss_iobase = sizeof(struct amd64tss);
gdt_segs[GPROC0_SEL].ssd_base = (long) &common_tss[cpu];
ssdtosyssd(&gdt_segs[GPROC0_SEL],

1
sys/amd64/include/tss.h
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@ -50,7 +50,6 @@ struct amd64tss {
u_int64_t tss_rsp2 __packed; /* kernel stack pointer ring 2 */
u_int32_t tss_rsvd1;
u_int32_t tss_rsvd2;
u_int32_t tss_rsvd3;
u_int64_t tss_ist1 __packed; /* Interrupt stack table 1 */
u_int64_t tss_ist2 __packed; /* Interrupt stack table 2 */
u_int64_t tss_ist3 __packed; /* Interrupt stack table 3 */