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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
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@ -46,6 +46,7 @@
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#include <linux/cred.h>
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#include <linux/cred.h>
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#include <linux/dax.h>
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#include <linux/dax.h>
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#include <linux/uaccess.h>
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#include <linux/uaccess.h>
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#include <linux/rseq.h>
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#include <asm/param.h>
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#include <asm/param.h>
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#include <asm/page.h>
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#include <asm/page.h>
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@ -288,6 +289,10 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
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if (bprm->have_execfd) {
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if (bprm->have_execfd) {
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NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
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NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
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}
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}
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#ifdef CONFIG_RSEQ
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NEW_AUX_ENT(AT_RSEQ_FEATURE_SIZE, offsetof(struct rseq, end));
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NEW_AUX_ENT(AT_RSEQ_ALIGN, __alignof__(struct rseq));
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#endif
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#undef NEW_AUX_ENT
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#undef NEW_AUX_ENT
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/* AT_NULL is zero; clear the rest too */
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/* AT_NULL is zero; clear the rest too */
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memset(elf_info, 0, (char *)mm->saved_auxv +
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memset(elf_info, 0, (char *)mm->saved_auxv +
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@ -30,6 +30,8 @@
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* differ from AT_PLATFORM. */
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* differ from AT_PLATFORM. */
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#define AT_RANDOM 25 /* address of 16 random bytes */
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#define AT_RANDOM 25 /* address of 16 random bytes */
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#define AT_HWCAP2 26 /* extension of AT_HWCAP */
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#define AT_HWCAP2 26 /* extension of AT_HWCAP */
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#define AT_RSEQ_FEATURE_SIZE 27 /* rseq supported feature size */
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#define AT_RSEQ_ALIGN 28 /* rseq allocation alignment */
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#define AT_EXECFN 31 /* filename of program */
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#define AT_EXECFN 31 /* filename of program */
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@ -130,6 +130,11 @@ struct rseq {
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* this thread.
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* this thread.
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*/
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*/
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__u32 flags;
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__u32 flags;
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/*
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* Flexible array member at end of structure, after last feature field.
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*/
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char end[];
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} __attribute__((aligned(4 * sizeof(__u64))));
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} __attribute__((aligned(4 * sizeof(__u64))));
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#endif /* _UAPI_LINUX_RSEQ_H */
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#endif /* _UAPI_LINUX_RSEQ_H */
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