Date: Sun, 13 Jun 2021 01:45:04 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: a34a4807c9f7 - stable/13 - ktrace: add a kern.ktrace.filesize_limit_signal knob Message-ID: <202106130145.15D1j4D1051904@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=a34a4807c9f7fa4001e4b4fa8bf319b08b51390f commit a34a4807c9f7fa4001e4b4fa8bf319b08b51390f Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2021-05-18 16:05:39 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2021-06-13 01:22:33 +0000 ktrace: add a kern.ktrace.filesize_limit_signal knob (cherry picked from commit ea2b64c2413355ac0d5fc6ff597342e9437a34d4) --- sys/kern/kern_ktrace.c | 10 ++++++++++ sys/kern/vfs_vnops.c | 10 +++++++--- sys/sys/ktrace.h | 1 + 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c index d44f6b9ab994..9568a752d820 100644 --- a/sys/kern/kern_ktrace.c +++ b/sys/kern/kern_ktrace.c @@ -142,6 +142,16 @@ u_int ktr_geniosize = PAGE_SIZE; SYSCTL_UINT(_kern_ktrace, OID_AUTO, genio_size, CTLFLAG_RWTUN, &ktr_geniosize, 0, "Maximum size of genio event payload"); +/* + * Allow to not to send signal to traced process, in which context the + * ktr record is written. The limit is applied from the process that + * set up ktrace, so killing the traced process is not completely fair. + */ +int ktr_filesize_limit_signal = 0; +SYSCTL_INT(_kern_ktrace, OID_AUTO, filesize_limit_signal, CTLFLAG_RWTUN, + &ktr_filesize_limit_signal, 0, + "Send SIGXFSZ to the traced process when the log size limit is exceeded"); + static int print_message = 1; static struct mtx ktrace_mtx; static struct sx ktrace_sx; diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index fb94b1470a2d..9c3d261a25c4 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -79,6 +79,7 @@ __FBSDID("$FreeBSD$"); #include <sys/syslog.h> #include <sys/unistd.h> #include <sys/user.h> +#include <sys/ktrace.h> #include <security/audit/audit.h> #include <security/mac/mac_framework.h> @@ -2361,6 +2362,7 @@ vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio, struct thread *td) { off_t lim; + bool ktr_write; if (vp->v_type != VREG || td == NULL || (td->td_pflags2 & TDP2_ACCT) != 0) @@ -2370,9 +2372,11 @@ vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio, if ((uoff_t)uio->uio_offset + uio->uio_resid < lim) return (0); - PROC_LOCK(td->td_proc); - kern_psignal(td->td_proc, SIGXFSZ); - PROC_UNLOCK(td->td_proc); + if (!ktr_write || ktr_filesize_limit_signal) { + PROC_LOCK(td->td_proc); + kern_psignal(td->td_proc, SIGXFSZ); + PROC_UNLOCK(td->td_proc); + } return (EFBIG); } diff --git a/sys/sys/ktrace.h b/sys/sys/ktrace.h index c4ab985722c0..50030d002f97 100644 --- a/sys/sys/ktrace.h +++ b/sys/sys/ktrace.h @@ -299,6 +299,7 @@ void ktrcapfail(enum ktr_cap_fail_type, const cap_rights_t *, #define ktrstat_error(s, error) \ ktrstruct_error("stat", (s), sizeof(struct stat), error) extern u_int ktr_geniosize; +extern int ktr_filesize_limit_signal; #else #include <sys/cdefs.h>
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