Date: Sat, 6 Nov 2021 02:25:20 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: a69fb7452ef9 - stable/13 - exec: provide right hardlink name in AT_EXECPATH Message-ID: <202111060225.1A62PKxg077447@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=a69fb7452ef97b5690f1811d4fb3b7b9f8ad78f8 commit a69fb7452ef97b5690f1811d4fb3b7b9f8ad78f8 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2021-10-23 00:24:08 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2021-11-06 02:12:31 +0000 exec: provide right hardlink name in AT_EXECPATH PR: 248184 (cherry picked from commit 0c10648fbb758bb76fd29330b7fe1bc519252325) --- sys/kern/kern_exec.c | 38 ++++++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 10 deletions(-) diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index 9b8ee7025a94..a82eefca62b7 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -401,6 +401,7 @@ do_execve(struct thread *td, struct image_args *args, struct mac *mac_p, #endif int error, i, orig_osrel; uint32_t orig_fctl0; + size_t freepath_size; static const char fexecv_proc_title[] = "(fexecv)"; imgp = &image_params; @@ -447,7 +448,8 @@ do_execve(struct thread *td, struct image_args *args, struct mac *mac_p, */ if (args->fname != NULL) { NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | LOCKSHARED | FOLLOW | - SAVENAME | AUDITVNODE1, UIO_SYSSPACE, args->fname, td); + SAVENAME | AUDITVNODE1 | WANTPARENT, + UIO_SYSSPACE, args->fname, td); } SDT_PROBE1(proc, , , exec, args->fname); @@ -592,9 +594,18 @@ interpret: /* * Do the best to calculate the full path to the image file. */ - if (args->fname != NULL && args->fname[0] == '/') - imgp->execpath = args->fname; - else { + if (args->fname != NULL) { + if (args->fname[0] == '/') { + imgp->execpath = args->fname; + } else { + VOP_UNLOCK(imgp->vp); + freepath_size = MAXPATHLEN; + if (vn_fullpath_hardlink(&nd, &imgp->execpath, + &imgp->freepath, &freepath_size) != 0) + imgp->execpath = args->fname; + vn_lock(imgp->vp, LK_SHARED | LK_RETRY); + } + } else { VOP_UNLOCK(imgp->vp); if (vn_fullpath(imgp->vp, &imgp->execpath, &imgp->freepath) != 0) @@ -647,8 +658,6 @@ interpret: VOP_UNSET_TEXT_CHECKED(newtextvp); imgp->textset = false; /* free name buffer and old vnode */ - if (args->fname != NULL) - NDFREE(&nd, NDF_ONLY_PNBUF); #ifdef MAC mac_execve_interpreter_enter(newtextvp, &interpvplabel); #endif @@ -657,6 +666,11 @@ interpret: imgp->opened = false; } vput(newtextvp); + if (args->fname != NULL) { + if (nd.ni_dvp != NULL) + vrele(nd.ni_dvp); + NDFREE(&nd, NDF_ONLY_PNBUF); + } vm_object_deallocate(imgp->object); imgp->object = NULL; execve_nosetid(imgp); @@ -664,9 +678,10 @@ interpret: free(imgp->freepath, M_TEMP); imgp->freepath = NULL; /* set new name to that of the interpreter */ - NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | LOCKSHARED | FOLLOW | - SAVENAME, UIO_SYSSPACE, imgp->interpreter_name, td); args->fname = imgp->interpreter_name; + NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | LOCKSHARED | FOLLOW | + SAVENAME | WANTPARENT, + UIO_SYSSPACE, imgp->interpreter_name, td); goto interpret; } @@ -907,8 +922,6 @@ exec_fail_dealloc: exec_unmap_first_page(imgp); if (imgp->vp != NULL) { - if (args->fname) - NDFREE(&nd, NDF_ONLY_PNBUF); if (imgp->opened) VOP_CLOSE(imgp->vp, FREAD, td->td_ucred, td); if (imgp->textset) @@ -917,6 +930,11 @@ exec_fail_dealloc: vput(imgp->vp); else VOP_UNLOCK(imgp->vp); + if (args->fname != NULL) { + if (nd.ni_dvp != NULL) + vrele(nd.ni_dvp); + NDFREE(&nd, NDF_ONLY_PNBUF); + } } if (imgp->object != NULL)
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