Date: Fri, 30 Sep 2022 02:04:09 GMT
From: Konstantin Belousov <kib@FreeBSD.org>
To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org
Subject: git: 05c462f16a61 - stable/13 - Add AT_USRSTACK{BASE, LIM} AT vectors, and ELF_BSDF_VMNOOVERCOMMIT flag
Message-ID: <202209300204.28U249VA099110@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=05c462f16a61ee46730d9d979ea958ff49f67af3 commit 05c462f16a61ee46730d9d979ea958ff49f67af3 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2022-09-12 19:32:02 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2022-09-30 00:29:09 +0000 Add AT_USRSTACK{BASE, LIM} AT vectors, and ELF_BSDF_VMNOOVERCOMMIT flag (cherry picked from commit ff41239f587f2c2850c10639bd0ab8b5422b33fa) --- sys/kern/imgact_elf.c | 17 ++++++++++++++--- sys/sys/elf_common.h | 5 ++++- 2 files changed, 18 insertions(+), 4 deletions(-) diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c index 34cfef0d7cd9..3308a27953a8 100644 --- a/sys/kern/imgact_elf.c +++ b/sys/kern/imgact_elf.c @@ -1439,11 +1439,15 @@ __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base) { Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; Elf_Auxinfo *argarray, *pos; - int error; + struct vmspace *vmspace; + rlim_t stacksz; + int error, bsdflags, oc; argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, M_WAITOK | M_ZERO); + vmspace = imgp->proc->p_vmspace; + if (args->execfd != -1) AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); @@ -1478,8 +1482,12 @@ __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base) AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); if (imgp->sysent->sv_hwcap2 != NULL) AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); - AUXARGS_ENTRY(pos, AT_BSDFLAGS, __elfN(sigfastblock) ? - ELF_BSDF_SIGFASTBLK : 0); + bsdflags = 0; + bsdflags |= __elfN(sigfastblock) ? ELF_BSDF_SIGFASTBLK : 0; + oc = atomic_load_int(&vm_overcommit); + bsdflags |= (oc & (SWAP_RESERVE_FORCE_ON | SWAP_RESERVE_RLIMIT_ON)) != + 0 ? ELF_BSDF_VMNOOVERCOMMIT : 0; + AUXARGS_ENTRY(pos, AT_BSDFLAGS, bsdflags); AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc); AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv); AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc); @@ -1489,6 +1497,9 @@ __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base) AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base); if (imgp->sysent->sv_vdso_base != 0 && __elfN(vdso) != 0) AUXARGS_ENTRY(pos, AT_KPRELOAD, imgp->sysent->sv_vdso_base); + AUXARGS_ENTRY(pos, AT_USRSTACKBASE, round_page(vmspace->vm_stacktop)); + stacksz = imgp->proc->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur; + AUXARGS_ENTRY(pos, AT_USRSTACKLIM, stacksz); AUXARGS_ENTRY(pos, AT_NULL, 0); free(imgp->auxargs, M_TEMP); diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h index 5b7a290fd761..884b8bb18d4f 100644 --- a/sys/sys/elf_common.h +++ b/sys/sys/elf_common.h @@ -985,8 +985,10 @@ typedef struct { #define AT_PS_STRINGS 32 /* struct ps_strings */ #define AT_FXRNG 33 /* Pointer to root RNG seed version. */ #define AT_KPRELOAD 34 /* Base of vdso, preloaded by rtld */ +#define AT_USRSTACKBASE 35 /* Top of user stack */ +#define AT_USRSTACKLIM 36 /* Grow limit of user stack */ -#define AT_COUNT 35 /* Count of defined aux entry types. */ +#define AT_COUNT 37 /* Count of defined aux entry types. */ /* * Relocation types. @@ -1504,5 +1506,6 @@ typedef struct { #define R_X86_64_REX_GOTPCRELX 42 #define ELF_BSDF_SIGFASTBLK 0x0001 /* Kernel supports fast sigblock */ +#define ELF_BSDF_VMNOOVERCOMMIT 0x0002 #endif /* !_SYS_ELF_COMMON_H_ */
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