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scancount=1 engine=8.12.0-2601150000 definitions=main-2602120150 X-Authority-Analysis: v=2.4 cv=YbOwJgRf c=1 sm=1 tr=0 ts=698e297e b=1 cx=c_pps a=e1sVV491RgrpLwSTMOnk8w==:117 a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=HzLeVaNsDn8A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=yPCof4ZbAAAA:8 a=bQ2ddsepk3EGGvJ8z-gA:9 a=CjuIK1q_8ugA:10 cc=ntf awl=host:13697 X-Proofpoint-ORIG-GUID: 1ntNcvlIbLE2G3W3TPbiFi6kcgVYxYFc X-Proofpoint-GUID: 1ntNcvlIbLE2G3W3TPbiFi6kcgVYxYFc X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEyMDE1MCBTYWx0ZWRfXxCgICJSf2Oa6 VYdi4qKxSyGPy0J5y14XYYMKDjA1GRr/T1/v1i2yE+gM6x3nHzEVEPsod0DwbL7KlsZL9ct8j5M 5gfe6crbm1SH5daozrtf4zHneh+yInMvPJKYXXeafVH0E1hjZjq5uPVx5ZUkL9Sqaz6LRtZfwRN 3ytlNJpbBwcp1A5iAHpZuxfNMV9W76R19PyRb97Ty1aL82ig5tNyzrAKeIKnwHrErxQmtJ+Qki+ wdPJRsl5wy94TCzX/+upWUH6/fLLTnmTfeCd2lV2ZYZ/PuzpxnkPfTfxQhI3PiDvVahtkzz5CPh 9gFIONdMOxcJZjCh3V7P3XTabY6yCqaymNe/7vM+5RsfXv85i5KJFQqsyckIe0YeR3JIX+vPGYg osmnIEjx/ToY9sEQBM/o/28eTHkKzWZG/V61cD0nzrzEHMKndTFD1OmaWK7FkBuCKTxLeI4GaK2 pkOLuOng5nb/1G5Pd/Tnls8CQeVoB5Mj6HSyMQJA= On Thu, Feb 12, 2026 at 07:17:29PM +0000, Nick Alcock wrote: > From: Eugene Loh > > Instead of using prf->prf_mapname (which resolves to the mapped file's > target), use Pmap_mapfile_name() to get the actual > /proc/$pid/map_files/* path. These magic symlinks can be opened even > when their corresponding files are deleted or in an inaccessible > filesystem namespace, ensuring we can read the mapping contents > reliably. DTrace already does this to read mappings during USDT probe > lookup. > > (We still use prf->prf_mapname to determine the module name used in the > dof helper, and thus ultimately in the probespec, because that should be > an actual user-readable module name, not some random address-space-like > filename: it doesn't matter that that name might not exist on the > filesystem. Thanks to Eugene Loh for spotting this and Kris van Hees > for fixing it.) > > Fixes issues with probes in paths like /home when dtprobed > is sandboxed by systemd. > > Tested on both systemd and non-systemd (non-jailed) systems, with USDT > programs running out of /tmp, /usr/local and /home. > > Signed-off-by: Nick Alcock Reviewed-by: Kris Van Hees > --- > dtprobed/dtprobed.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/dtprobed/dtprobed.c b/dtprobed/dtprobed.c > index a808586559d96..34349deb028be 100644 > --- a/dtprobed/dtprobed.c > +++ b/dtprobed/dtprobed.c > @@ -487,16 +487,17 @@ handle_usdt_notes(pid_t pid, uintptr_t addr) > fuse_log(FUSE_LOG_ERR, "%i: dtprobed: cannot look up mapping (process dead?)\n", > pid); > goto out; > - } else if ((fn = prf->prf_mapname) == NULL) { > + } else if (prf->prf_mapname == NULL || > + (fn = Pmap_mapfile_name(P, mapp)) == NULL) { > fuse_log(FUSE_LOG_ERR, "%i: dtprobed: cannot look up mapname (process dead?)\n", > pid); > goto out; > } > - mod = strrchr(fn, '/'); > + mod = strrchr(prf->prf_mapname, '/'); > if (mod) > mod++; > else > - mod = fn; > + mod = prf->prf_mapname; > snprintf(dh.dofhp_mod, sizeof(dh.dofhp_mod), "%s", mod); > > dh.dofhp_addr = mapp->pr_vaddr; > > base-commit: 9abccde65bd924a5b63258eebb5210952709768d > prerequisite-patch-id: d178f9e04afa5cca97d93ef7659a72dff6d364b6 > -- > 2.53.0.286.g870d7528e3 >