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From bc215d06720b346ba0d888a6149cf90f544a90ad Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Wed, 20 Jun 2018 17:00:24 -0400
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Subject: [PATCH 16/34] If we can't parse part of the device link, skip it and
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set DEV_ABBREV_ONLY
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If we can't parse some part of the device symlink, we can't write a full
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device path, but we can write an abbreviated HD() or File() path. So if
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we've exausted all possibilities, skip to the next node, set
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DEV_ABBREV_ONLY in the device's flags, and try parsing again. Then when
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creator.c checks if that flag conflicts, it'll throw an error if it
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does.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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src/linux.c | 62 ++++++++++++++++++++++++++++++++++++++++-------------
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1 file changed, 47 insertions(+), 15 deletions(-)
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diff --git a/src/linux.c b/src/linux.c
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index 1e7db4e3f61..8fe21f19f78 100644
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--- a/src/linux.c
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+++ b/src/linux.c
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@@ -429,14 +429,17 @@ struct device HIDDEN
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const char *current = dev->link;
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bool needs_root = true;
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+ int last_successful_probe = -1;
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debug(DEBUG, "searching for device nodes in %s", dev->link);
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for (i = 0; dev_probes[i] && dev_probes[i]->parse; i++) {
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struct dev_probe *probe = dev_probes[i];
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ssize_t pos;
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- if (!needs_root && (probe->flags & DEV_PROVIDES_ROOT)) {
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- debug(DEBUG, "not testing %s because flags is 0x%x", probe->name, probe->flags);
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+ if (!needs_root &&
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+ (probe->flags & DEV_PROVIDES_ROOT)) {
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+ debug(DEBUG, "not testing %s because flags is 0x%x",
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+ probe->name, probe->flags);
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continue;
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}
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@@ -445,22 +448,51 @@ struct device HIDDEN
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if (pos < 0) {
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efi_error("parsing %s failed", probe->name);
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goto err;
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- } else if (pos == 0) {
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+ } else if (pos > 0) {
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+ debug(DEBUG, "%s matched %s", probe->name, current);
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+ dev->flags |= probe->flags;
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+
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+ if (probe->flags & DEV_PROVIDES_HD ||
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+ probe->flags & DEV_PROVIDES_ROOT ||
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+ probe->flags & DEV_ABBREV_ONLY)
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+ needs_root = false;
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+
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+ dev->probes[n++] = dev_probes[i];
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+ current += pos;
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+ debug(DEBUG, "current:%s", current);
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+ last_successful_probe = i;
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+
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+ if (!*current || !strncmp(current, "block/", 6))
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+ break;
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+
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continue;
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}
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- debug(DEBUG, "%s matched %s", probe->name, current);
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- dev->flags |= probe->flags;
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- if (probe->flags & DEV_PROVIDES_HD ||
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- probe->flags & DEV_PROVIDES_ROOT ||
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- probe->flags & DEV_ABBREV_ONLY)
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- needs_root = false;
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- dev->probes[n++] = dev_probes[i];
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- current += pos;
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- debug(DEBUG, "current:%s", current);
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-
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- if (!*current || !strncmp(current, "block/", 6))
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- break;
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+ debug(DEBUG, "dev_probes[i+1]: %p dev->interface_type: %d\n",
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+ dev_probes[i+1], dev->interface_type);
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+ if (dev_probes[i+1] == NULL && dev->interface_type == unknown) {
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+ int new_pos = 0;
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+ rc = sscanf(current, "%*[^/]/%n", &new_pos);
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+ if (rc < 0) {
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+ efi_error(
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+ "Cannot parse device link segment \"%s\"",
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+ current);
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+ goto err;
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+ }
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+ debug(DEBUG,
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+ "Cannot parse device link segment \"%s\"",
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+ current);
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+ debug(DEBUG, "Skipping to \"%s\"", current + new_pos);
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+ debug(DEBUG,
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+ "This means we can only write abbreviated paths");
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+ if (rc < 0)
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+ goto err;
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+ if (new_pos == 0)
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+ goto err;
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+ dev->flags |= DEV_ABBREV_ONLY;
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+ i = last_successful_probe;
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+ current += new_pos;
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+ }
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}
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if (dev->interface_type == unknown) {
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--
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2.17.1
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