rhbz1650371.patch is now in upstream; remove
This commit is contained in:
Serhei Makarov
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1a31851092
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@ -1,134 +0,0 @@
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commit fba365b4d365f54ab7ef60272996dc2889461640
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Author: Frank Ch. Eigler <fche@redhat.com>
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Date: Thu Nov 15 16:27:58 2018 -0500
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PR23890: tolerate f29+ style ELF files
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Reported by kenj@pcp, with mjw et al.'s help, we found out why
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systemtap on fedora 29+ routinely fails to verify build-ids for
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userspace programs. F29 adds a separate loadable segment with the
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relevante .note's, before the main text segment. The runtime code
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that listens to mmaps-in-progress now accepts this configuration.
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As long as the .note section is loaded (time-wise and space-wise)
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before the .text one(s), we're good.
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diff --git a/runtime/linux/uprobes-inode.c b/runtime/linux/uprobes-inode.c
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index 6d450c90d87c..b9604e6385ce 100644
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--- a/runtime/linux/uprobes-inode.c
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+++ b/runtime/linux/uprobes-inode.c
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@@ -563,9 +563,11 @@ stapiu_change_plus(struct stapiu_target* target, struct task_struct *task,
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return rc;
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}
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- /* Actually do the check. */
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+ /* Actually do the check. NB: on F29+, offset may not equal 0
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+ for LOADable "R E" segments, because the read-only .note.*
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+ stuff may have been loaded earlier, separately. PR23890. */
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if ((rc = _stp_usermodule_check(task, target->filename,
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- relocation))) {
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+ relocation - offset))) {
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/* Be sure to release the inode on failure. */
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iput(target->inode);
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target->inode = NULL;
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commit 824e9ab80108c1882842fc2a4b4abd1aee990ecc (upstream/master)
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Author: Frank Ch. Eigler <fche@redhat.com>
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Date: Thu Nov 15 20:22:34 2018 -0500
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PR23890 bonus: show nicer messages upon a buildid mismatch
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Instead of producing only a one-byte error, we now compute the entire
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builds into hex text strings, and report the whole shebang on an
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error. (Also, ditch some 2.6.27 kernel-bug compatibiltiy fossil
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in the area.)
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diff --git a/runtime/sym.c b/runtime/sym.c
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index 60f0fa980964..111147ee555d 100644
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--- a/runtime/sym.c
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+++ b/runtime/sym.c
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@@ -636,30 +636,46 @@ unsigned long _stp_linenumber_lookup(unsigned long addr, struct task_struct *tas
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return 0;
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}
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+
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+// Compare two build-id hex strings, each of length m->build_id_len bytes.
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+// Since mismatches can mystify, produce a hex-textual version of both
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+// expected and actual strings, and compare textually. Failure messages
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+// are more intelligible this way.
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static int _stp_build_id_check (struct _stp_module *m,
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unsigned long notes_addr,
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struct task_struct *tsk)
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{
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- int j;
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+ enum { max_buildid_hexstring = 65 };
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+ static const char hexnibble[16]="0123456789abcdef";
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+ char hexstring_theory[max_buildid_hexstring], hexstring_practice[max_buildid_hexstring];
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+ int buildid_len = min((max_buildid_hexstring-1)/2, m->build_id_len);
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+
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+ int i, j;
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+
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+ memset(hexstring_theory, '\0', max_buildid_hexstring);
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+ for (i=0, j=0; j<buildid_len; j++) {
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+ unsigned char theory = m->build_id_bits[j];
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+ hexstring_theory[i++] = hexnibble[theory >> 4];
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+ hexstring_theory[i++] = hexnibble[theory & 15];
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+ }
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- for (j = 0; j < m->build_id_len; j++) {
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+ memset(hexstring_practice, '\0', max_buildid_hexstring);
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+ for (i=0, j=0; j<buildid_len; j++) {
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/* Use set_fs / get_user to access conceivably invalid addresses.
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* If loc2c-runtime.h were more easily usable, a deref() loop
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* could do it too. */
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mm_segment_t oldfs = get_fs();
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int rc;
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- unsigned char theory, practice = 0;
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+ unsigned char practice = 0;
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#ifdef STAPCONF_PROBE_KERNEL
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if (!tsk) {
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- theory = m->build_id_bits[j];
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set_fs(KERNEL_DS);
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rc = probe_kernel_read(&practice, (void*)(notes_addr + j), 1);
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}
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else
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#endif
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{
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- theory = m->build_id_bits[j];
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set_fs (tsk ? USER_DS : KERNEL_DS);
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/*
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@@ -685,21 +701,19 @@ static int _stp_build_id_check (struct _stp_module *m,
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}
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set_fs(oldfs);
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- if (rc || (theory != practice)) {
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-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
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- _stp_error ("Build-id mismatch [man error::buildid]: \"%s\" byte %d (0x%02x vs 0x%02x) address %#lx rc %d\n",
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- m->path, j, theory, practice, notes_addr, rc);
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+ if (rc == 0) { // got actual data byte
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+ hexstring_practice[i++] = hexnibble[practice >> 4];
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+ hexstring_practice[i++] = hexnibble[practice & 15];
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+ }
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+ }
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+
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+ // have two strings, will travel
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+ if (strcmp (hexstring_practice, hexstring_theory)) {
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+ _stp_error ("Build-id mismatch [man error::buildid]: \"%s\" address %#lx, expected %s actual %s\n",
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+ m->path, notes_addr, hexstring_theory, hexstring_practice);
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return 1;
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-#else
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- /* This branch is a surrogate for kernels affected by Fedora bug
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- * #465873. */
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- _stp_warn (KERN_WARNING
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- "Build-id mismatch [man error::buildid]: \"%s\" byte %d (0x%02x vs 0x%02x) rc %d\n",
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- m->path, j, theory, practice, rc);
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-#endif
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- break;
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- } /* end mismatch */
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- } /* end per-byte check loop */
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+ }
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+
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return 0;
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}
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