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author | Florian Weimer <fweimer@redhat.com> | 2024-05-30 15:43:07 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2024-05-30 15:48:25 +0200 |
commit | 90ee0d87302810f1670a1fbcf9455b883309b1de (patch) | |
tree | d7aa1435887404eec44cda4c7d0a061cc930e29f | |
parent | f5bfd0e47c842f47979751297d3b83f34be8476c (diff) | |
download | glibc-90ee0d87302810f1670a1fbcf9455b883309b1de.zip glibc-90ee0d87302810f1670a1fbcf9455b883309b1de.tar.gz glibc-90ee0d87302810f1670a1fbcf9455b883309b1de.tar.bz2 |
x86_64: Always initialize ssp_base in the TCB if SHSTK is enabled
-rw-r--r-- | sysdeps/x86_64/dl-cet.c | 8 | ||||
-rw-r--r-- | sysdeps/x86_64/nptl/nptl_arch_thread_init.h | 29 |
2 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/x86_64/dl-cet.c b/sysdeps/x86_64/dl-cet.c index 1297c09..d218549 100644 --- a/sysdeps/x86_64/dl-cet.c +++ b/sysdeps/x86_64/dl-cet.c @@ -333,6 +333,14 @@ _dl_cet_setup_features (unsigned int cet_feature) enabled from executable, not necessarily supported by kernel. */ if (cet_feature != 0) { + void **ssp; + asm ("rdsspq %0" + : "=r" (ssp) + : "0" (0)); + if (ssp != NULL) + /* The caller is the top-most frame, hence the + 8. */ + THREAD_SETMEM (THREAD_SELF, header.ssp_base, ssp + 8); + cet_feature = dl_cet_get_cet_status (); if (cet_feature != 0) { diff --git a/sysdeps/x86_64/nptl/nptl_arch_thread_init.h b/sysdeps/x86_64/nptl/nptl_arch_thread_init.h new file mode 100644 index 0000000..64de1d5 --- /dev/null +++ b/sysdeps/x86_64/nptl/nptl_arch_thread_init.h @@ -0,0 +1,29 @@ +/* Architecture-specific thread initialization for NPTL. x86-64 version. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +static inline __always_inline void +__nptl_arch_thread_init (void) +{ +#if CET_ENABLED + void **ssp; + asm ("rdsspq %0" + : "=r" (ssp) + : "0" (0)); + THREAD_SETMEM (THREAD_SELF, header.ssp_base, ssp); +#endif +} |