Date: Tue, 20 Oct 2020 17:24:30 +0000 (UTC) From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r366900 - head/sys/compat/linprocfs Message-ID: <202010201724.09KHOUQV050725@repo.freebsd.org>
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Author: trasz Date: Tue Oct 20 17:24:29 2020 New Revision: 366900 URL: https://svnweb.freebsd.org/changeset/base/366900 Log: Fix linprocfs(4) /proc/self/mem semantics to more closely match Linux. Steam's Anti-Cheat might depend on it. PR: 248223 Analyzed by: Alex S <iwtcex@gmail.com> Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D26816 Modified: head/sys/compat/linprocfs/linprocfs.c Modified: head/sys/compat/linprocfs/linprocfs.c ============================================================================== --- head/sys/compat/linprocfs/linprocfs.c Tue Oct 20 17:19:10 2020 (r366899) +++ head/sys/compat/linprocfs/linprocfs.c Tue Oct 20 17:24:29 2020 (r366900) @@ -1276,6 +1276,27 @@ linprocfs_doprocmaps(PFS_FILL_ARGS) } /* + * Filler function for proc/pid/mem + */ +static int +linprocfs_doprocmem(PFS_FILL_ARGS) +{ + ssize_t resid; + int error; + + resid = uio->uio_resid; + error = procfs_doprocmem(PFS_FILL_ARGNAMES); + + if (uio->uio_rw == UIO_READ && resid != uio->uio_resid) + return (0); + + if (error == EFAULT) + error = EIO; + + return (error); +} + +/* * Criteria for interface name translation */ #define IFP_IS_ETH(ifp) (ifp->if_type == IFT_ETHER) @@ -1853,7 +1874,7 @@ linprocfs_init(PFS_INIT_ARGS) NULL, &procfs_notsystem, NULL, 0); pfs_create_file(dir, "maps", &linprocfs_doprocmaps, NULL, NULL, NULL, PFS_RD); - pfs_create_file(dir, "mem", &procfs_doprocmem, + pfs_create_file(dir, "mem", &linprocfs_doprocmem, procfs_attr_rw, &procfs_candebug, NULL, PFS_RDWR | PFS_RAW); pfs_create_file(dir, "mounts", &linprocfs_domtab, NULL, NULL, NULL, PFS_RD);
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