7e7241f620
Upstream commit: 808a84a8b81468b517a4d721fdc62069cb8c211f
- Fix underallocation of abort_msg_s struct (CVE-2025-0395)
- x86/string: Fixup alignment of main loop in str{n}cmp-evex [BZ #32212]
- x86: Improve large memset perf with non-temporal stores [RHEL-29312]
- x86: Avoid integer truncation with large cache sizes (bug 32470)
- math: Exclude internal math symbols for tests [BZ #32414]
- malloc: add indirection for malloc(-like) functions in tests [BZ #32366]
- Pass -nostdlib -nostartfiles together with -r [BZ #31753]
- nptl: initialize cpu_id_start prior to rseq registration
- nptl: initialize rseq area prior to registration
30 lines
1.3 KiB
Diff
30 lines
1.3 KiB
Diff
commit 350db2839387659e1500a54d276e401c9c6b2dee
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Author: Michael Jeanson <mjeanson@efficios.com>
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Date: Wed Nov 20 14:15:42 2024 -0500
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nptl: initialize cpu_id_start prior to rseq registration
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When adding explicit initialization of rseq fields prior to
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registration, I glossed over the fact that 'cpu_id_start' is also
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documented as initialized by user-space.
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While current kernels don't validate the content of this field on
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registration, future ones could.
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Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
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Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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(cherry picked from commit d9f40387d3305d97e30a8cf8724218c42a63680a)
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diff --git a/sysdeps/unix/sysv/linux/rseq-internal.h b/sysdeps/unix/sysv/linux/rseq-internal.h
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index 37a8f630b6519ff0..ef3eab1fefd4d90d 100644
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--- a/sysdeps/unix/sysv/linux/rseq-internal.h
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+++ b/sysdeps/unix/sysv/linux/rseq-internal.h
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@@ -56,6 +56,7 @@ rseq_register_current_thread (struct pthread *self, bool do_rseq)
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registration, there is no guarantee that struct pthread is
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cleared on all architectures. */
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THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_UNINITIALIZED);
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+ THREAD_SETMEM (self, rseq_area.cpu_id_start, 0);
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THREAD_SETMEM (self, rseq_area.rseq_cs, 0);
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THREAD_SETMEM (self, rseq_area.flags, 0);
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