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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2022-11-22 21:39:04 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-12-27 12:52:10 +0100 |
| commit | 317c8194e6aeb8b3b573ad139fc2a0635856498e (patch) | |
| tree | 487894b9890601c50b9a966a3708c2922ae78ba8 /fs/binfmt_elf.c | |
| parent | selftests/rseq: Fix: Fail thread registration when CONFIG_RSEQ=n (diff) | |
| download | linux-317c8194e6aeb8b3b573ad139fc2a0635856498e.tar.xz linux-317c8194e6aeb8b3b573ad139fc2a0635856498e.zip | |
rseq: Introduce feature size and alignment ELF auxiliary vector entries
Export the rseq feature size supported by the kernel as well as the
required allocation alignment for the rseq per-thread area to user-space
through ELF auxiliary vector entries.
This is part of the extensible rseq ABI.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-3-mathieu.desnoyers@efficios.com
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index de63572a9404..0ba86f0b1477 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -46,6 +46,7 @@ #include <linux/cred.h> #include <linux/dax.h> #include <linux/uaccess.h> +#include <linux/rseq.h> #include <asm/param.h> #include <asm/page.h> @@ -288,6 +289,10 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec, if (bprm->have_execfd) { NEW_AUX_ENT(AT_EXECFD, bprm->execfd); } +#ifdef CONFIG_RSEQ + NEW_AUX_ENT(AT_RSEQ_FEATURE_SIZE, offsetof(struct rseq, end)); + NEW_AUX_ENT(AT_RSEQ_ALIGN, __alignof__(struct rseq)); +#endif #undef NEW_AUX_ENT /* AT_NULL is zero; clear the rest too */ memset(elf_info, 0, (char *)mm->saved_auxv + |