From 3f0ce63828dc3d4030b32ad0effb4e588af49c03 Mon Sep 17 00:00:00 2001 From: Mariusz Zaborski Date: Thu, 28 Sep 2023 15:24:39 +0200 Subject: [PATCH] copy_file_range: require CAP_SEEK capability When using copy_file_range(2) with an offset parameter, the CAP_SEEK capability should be required. This requirement is similar to the behavior observed with pread(2)/pwrite(2). Reported by: theraven Reviewed by: emaste, theraven, kib, markj Approved by: secteam Differential Revision: https://reviews.freebsd.org/D41967 (cherry picked from commit 15a51d3abaef27ddea66320cac7caa549738a1a6) --- sys/kern/vfs_syscalls.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c index 594c4f5ef23..cf733133bec 100644 --- a/sys/kern/vfs_syscalls.c +++ b/sys/kern/vfs_syscalls.c @@ -4886,7 +4886,8 @@ kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, len = SSIZE_MAX; /* Get the file structures for the file descriptors. */ - error = fget_read(td, infd, &cap_read_rights, &infp); + error = fget_read(td, infd, + inoffp != NULL ? &cap_pread_rights : &cap_read_rights, &infp); if (error != 0) goto out; if (infp->f_ops == &badfileops) { @@ -4897,7 +4898,8 @@ kern_copy_file_range(struct thread *td, int infd, off_t *inoffp, int outfd, error = EINVAL; goto out; } - error = fget_write(td, outfd, &cap_write_rights, &outfp); + error = fget_write(td, outfd, + outoffp != NULL ? &cap_pwrite_rights : &cap_write_rights, &outfp); if (error != 0) goto out; if (outfp->f_ops == &badfileops) { -- 2.45.0