Date: Fri, 3 Aug 2018 14:08:39 +0000 (UTC) From: Alan Somers <asomers@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r337244 - in stable/10: contrib/netbsd-tests/lib/libc/sys lib/libc/sys Message-ID: <201808031408.w73E8dEW064866@repo.freebsd.org>
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Author: asomers Date: Fri Aug 3 14:08:39 2018 New Revision: 337244 URL: https://svnweb.freebsd.org/changeset/base/337244 Log: MFC r328266: mlock(2): correct documentation for error conditions. The man page is years out of date regarding errors. Our implementation _does_ allow unaligned addresses, and it _does_not_ check for negative lengths, because the length is unsigned. It checks for overflow instead. Update the tests accordingly. Reviewed by: bcr Differential Revision: https://reviews.freebsd.org/D13826 Modified: stable/10/contrib/netbsd-tests/lib/libc/sys/t_mlock.c stable/10/lib/libc/sys/mlock.2 Directory Properties: stable/10/ (props changed) Modified: stable/10/contrib/netbsd-tests/lib/libc/sys/t_mlock.c ============================================================================== --- stable/10/contrib/netbsd-tests/lib/libc/sys/t_mlock.c Fri Aug 3 14:06:08 2018 (r337243) +++ stable/10/contrib/netbsd-tests/lib/libc/sys/t_mlock.c Fri Aug 3 14:08:39 2018 (r337244) @@ -131,33 +131,38 @@ ATF_TC_BODY(mlock_err, tc) ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1); errno = 0; - ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1); - - errno = 0; ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1); errno = 0; ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1); +#ifdef __FreeBSD__ + /* Wrap around should return EINVAL */ errno = 0; + ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1); + errno = 0; + ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1); +#else + errno = 0; + ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1); + errno = 0; ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)-1, page) == -1); +#endif - buf = malloc(page); + buf = malloc(page); /* Get a valid address */ ATF_REQUIRE(buf != NULL); - - /* - * unlocking memory that is not locked is an error... - */ - +#ifdef __FreeBSD__ errno = 0; - ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1); - - /* - * These are permitted to fail (EINVAL) but do not on NetBSD - */ - ATF_REQUIRE(mlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0); - ATF_REQUIRE(munlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0); - + /* Wrap around should return EINVAL */ + ATF_REQUIRE_ERRNO(EINVAL, mlock(buf, -page) == -1); + errno = 0; + ATF_REQUIRE_ERRNO(EINVAL, munlock(buf, -page) == -1); +#else + errno = 0; + ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, -page) == -1); + errno = 0; + ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, -page) == -1); +#endif (void)free(buf); /* @@ -355,6 +360,80 @@ ATF_TC_CLEANUP(mlock_nested, tc) } #endif +#ifdef __FreeBSD__ +ATF_TC_WITH_CLEANUP(mlock_unaligned); +#else +ATF_TC(mlock_unaligned); +#endif +ATF_TC_HEAD(mlock_unaligned, tc) +{ + atf_tc_set_md_var(tc, "descr", + "Test that mlock(2) can lock page-unaligned memory"); +#ifdef __FreeBSD__ + atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects"); + atf_tc_set_md_var(tc, "require.user", "root"); +#endif +} + +ATF_TC_BODY(mlock_unaligned, tc) +{ + void *buf, *addr; + +#ifdef __FreeBSD__ + /* Set max_wired really really high to avoid EAGAIN */ + set_vm_max_wired(INT_MAX); +#endif + + buf = malloc(page); + ATF_REQUIRE(buf != NULL); + + if ((uintptr_t)buf & ((uintptr_t)page - 1)) + addr = buf; + else + addr = (void *)(((uintptr_t)buf) + page/3); + + ATF_REQUIRE_EQ(mlock(addr, page/5), 0); + ATF_REQUIRE_EQ(munlock(addr, page/5), 0); + + (void)free(buf); +} + +#ifdef __FreeBSD__ +ATF_TC_CLEANUP(mlock_unaligned, tc) +{ + + restore_vm_max_wired(); +} +#endif + +ATF_TC(munlock_unlocked); +ATF_TC_HEAD(munlock_unlocked, tc) +{ + atf_tc_set_md_var(tc, "descr", +#ifdef __FreeBSD__ + "munlock(2) accepts unlocked memory"); +#else + "munlock(2) of unlocked memory is an error"); +#endif + atf_tc_set_md_var(tc, "require.user", "root"); +} + +ATF_TC_BODY(munlock_unlocked, tc) +{ + void *buf; + + buf = malloc(page); + ATF_REQUIRE(buf != NULL); + +#ifdef __FreeBSD__ + ATF_REQUIRE_EQ(munlock(buf, page), 0); +#else + errno = 0; + ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1); +#endif + (void)free(buf); +} + ATF_TP_ADD_TCS(tp) { @@ -366,6 +445,8 @@ ATF_TP_ADD_TCS(tp) ATF_TP_ADD_TC(tp, mlock_limits); ATF_TP_ADD_TC(tp, mlock_mmap); ATF_TP_ADD_TC(tp, mlock_nested); + ATF_TP_ADD_TC(tp, mlock_unaligned); + ATF_TP_ADD_TC(tp, munlock_unlocked); return atf_no_error(); } Modified: stable/10/lib/libc/sys/mlock.2 ============================================================================== --- stable/10/lib/libc/sys/mlock.2 Fri Aug 3 14:06:08 2018 (r337243) +++ stable/10/lib/libc/sys/mlock.2 Fri Aug 3 14:08:39 2018 (r337244) @@ -28,7 +28,7 @@ .\" @(#)mlock.2 8.2 (Berkeley) 12/11/93 .\" $FreeBSD$ .\" -.Dd May 17, 2014 +.Dd Jan 22, 2018 .Dt MLOCK 2 .Os .Sh NAME @@ -125,7 +125,7 @@ will fail if: .Va security.bsd.unprivileged_mlock is set to 0 and the caller is not the super-user. .It Bq Er EINVAL -The address given is not page aligned or the length is negative. +The address range given wraps around zero. .It Bq Er EAGAIN Locking the indicated range would exceed the system limit for locked memory. .It Bq Er ENOMEM @@ -143,7 +143,7 @@ will fail if: .Va security.bsd.unprivileged_mlock is set to 0 and the caller is not the super-user. .It Bq Er EINVAL -The address given is not page aligned or the length is negative. +The address range given wraps around zero. .It Bq Er ENOMEM Some or all of the address range specified by the addr and len arguments does not correspond to valid mapped pages in the address space
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