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selftests/x86/ldt_gdt: Add infrastructure to test set_thread_area()
commit d744dcad39
upstream.
Much of the test design could apply to set_thread_area() (i.e. GDT),
not just modify_ldt(). Add set_thread_area() to the
install_valid_mode() helper.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/02c23f8fba5547007f741dc24c3926e5284ede02.1509794321.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
d9eb267780
commit
46e6a15b40
1 changed files with 39 additions and 18 deletions
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@ -137,30 +137,51 @@ static void check_valid_segment(uint16_t index, int ldt,
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}
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}
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static bool install_valid_mode(const struct user_desc *desc, uint32_t ar,
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bool oldmode)
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static bool install_valid_mode(const struct user_desc *d, uint32_t ar,
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bool oldmode, bool ldt)
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{
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int ret = syscall(SYS_modify_ldt, oldmode ? 1 : 0x11,
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desc, sizeof(*desc));
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if (ret < -1)
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errno = -ret;
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if (ret == 0) {
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uint32_t limit = desc->limit;
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if (desc->limit_in_pages)
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limit = (limit << 12) + 4095;
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check_valid_segment(desc->entry_number, 1, ar, limit, true);
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return true;
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} else if (errno == ENOSYS) {
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printf("[OK]\tmodify_ldt returned -ENOSYS\n");
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struct user_desc desc = *d;
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int ret;
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if (!ldt) {
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#ifndef __i386__
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/* No point testing set_thread_area in a 64-bit build */
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return false;
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#endif
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if (!gdt_entry_num)
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return false;
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desc.entry_number = gdt_entry_num;
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ret = syscall(SYS_set_thread_area, &desc);
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} else {
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if (desc->seg_32bit) {
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printf("[FAIL]\tUnexpected modify_ldt failure %d\n",
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ret = syscall(SYS_modify_ldt, oldmode ? 1 : 0x11,
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&desc, sizeof(desc));
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if (ret < -1)
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errno = -ret;
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if (ret != 0 && errno == ENOSYS) {
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printf("[OK]\tmodify_ldt returned -ENOSYS\n");
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return false;
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}
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}
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if (ret == 0) {
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uint32_t limit = desc.limit;
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if (desc.limit_in_pages)
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limit = (limit << 12) + 4095;
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check_valid_segment(desc.entry_number, ldt, ar, limit, true);
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return true;
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} else {
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if (desc.seg_32bit) {
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printf("[FAIL]\tUnexpected %s failure %d\n",
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ldt ? "modify_ldt" : "set_thread_area",
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errno);
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nerrs++;
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return false;
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} else {
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printf("[OK]\tmodify_ldt rejected 16 bit segment\n");
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printf("[OK]\t%s rejected 16 bit segment\n",
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ldt ? "modify_ldt" : "set_thread_area");
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return false;
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}
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}
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@ -168,7 +189,7 @@ static bool install_valid_mode(const struct user_desc *desc, uint32_t ar,
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static bool install_valid(const struct user_desc *desc, uint32_t ar)
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{
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return install_valid_mode(desc, ar, false);
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return install_valid_mode(desc, ar, false, true);
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}
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static void install_invalid(const struct user_desc *desc, bool oldmode)
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