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142 lines
7.0 KiB
142 lines
7.0 KiB
1 month ago
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From 466da97e11cebf84a293789d0f4f38779244a5b3 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 11 Nov 2022 17:36:29 +0100
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Subject: [PATCH] bootctl,bootspec: make use of CHASE_PROHIBIT_SYMLINKS
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whenever we access the ESP/XBOOTLDR
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Let's make use of the new flag whenever we access the ESP or XBOOTLDR.
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The resources we make use of in these partitions can't possibly use
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symlinks (because UEFI knows no symlink concept), and they are untrusted
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territory, hence under no circumstances we should be tricked into
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following symlinks that shouldn't be there in the first place.
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Of course, you might argue thta ESP/XBOOTLDR are VFAT and thus don#t
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know symlinks. But the thing is, they don#t have to be. Firmware can
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support other file systems too, and people can use efifs to gain access
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to arbitrary Linux file systems from EFI. Hence, let's better be safe
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than sorry.
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(cherry picked from commit b353d5eee9e8df0aa2f4cbb1bfb0a46a963ba78f)
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Related: RHEL-16952
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---
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src/boot/bootctl.c | 18 +++++++++---------
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src/shared/bootspec.c | 8 ++++----
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2 files changed, 13 insertions(+), 13 deletions(-)
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diff --git a/src/boot/bootctl.c b/src/boot/bootctl.c
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index a0ca2afec2..e830d45486 100644
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--- a/src/boot/bootctl.c
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+++ b/src/boot/bootctl.c
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@@ -485,7 +485,7 @@ static int enumerate_binaries(
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assert(previous);
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assert(is_first);
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- r = chase_symlinks_and_opendir(path, esp_path, CHASE_PREFIX_ROOT, &p, &d);
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+ r = chase_symlinks_and_opendir(path, esp_path, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &p, &d);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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@@ -918,10 +918,10 @@ static int copy_one_file(const char *esp_path, const char *name, bool force) {
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if (!p)
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return log_oom();
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- r = chase_symlinks(p, root, CHASE_PREFIX_ROOT, &source_path, NULL);
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+ r = chase_symlinks(p, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &source_path, NULL);
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/* If we had a root directory to try, we didn't find it and we are in auto mode, retry on the host */
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if (r == -ENOENT && root && arg_install_source == ARG_INSTALL_SOURCE_AUTO)
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- r = chase_symlinks(p, NULL, CHASE_PREFIX_ROOT, &source_path, NULL);
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+ r = chase_symlinks(p, NULL, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &source_path, NULL);
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if (r < 0)
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return log_error_errno(r,
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"Failed to resolve path %s%s%s: %m",
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@@ -933,7 +933,7 @@ static int copy_one_file(const char *esp_path, const char *name, bool force) {
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if (!q)
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return log_oom();
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- r = chase_symlinks(q, esp_path, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &dest_path, NULL);
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+ r = chase_symlinks(q, esp_path, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS|CHASE_NONEXISTENT, &dest_path, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to resolve path %s under directory %s: %m", q, esp_path);
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@@ -950,7 +950,7 @@ static int copy_one_file(const char *esp_path, const char *name, bool force) {
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v = strjoina("/EFI/BOOT/BOOT", e);
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ascii_strupper(strrchr(v, '/') + 1);
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- r = chase_symlinks(v, esp_path, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &default_dest_path, NULL);
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+ r = chase_symlinks(v, esp_path, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS|CHASE_NONEXISTENT, &default_dest_path, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to resolve path %s under directory %s: %m", v, esp_path);
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@@ -968,10 +968,10 @@ static int install_binaries(const char *esp_path, const char *arch, bool force)
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_cleanup_free_ char *path = NULL;
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int r;
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- r = chase_symlinks_and_opendir(BOOTLIBDIR, root, CHASE_PREFIX_ROOT, &path, &d);
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+ r = chase_symlinks_and_opendir(BOOTLIBDIR, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &path, &d);
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/* If we had a root directory to try, we didn't find it and we are in auto mode, retry on the host */
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if (r == -ENOENT && root && arg_install_source == ARG_INSTALL_SOURCE_AUTO)
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- r = chase_symlinks_and_opendir(BOOTLIBDIR, NULL, CHASE_PREFIX_ROOT, &path, &d);
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+ r = chase_symlinks_and_opendir(BOOTLIBDIR, NULL, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &path, &d);
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if (r < 0)
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return log_error_errno(r, "Failed to open boot loader directory %s%s: %m", strempty(root), BOOTLIBDIR);
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@@ -1141,7 +1141,7 @@ static int install_variables(
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return 0;
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}
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- r = chase_symlinks_and_access(path, esp_path, CHASE_PREFIX_ROOT, F_OK, NULL, NULL);
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+ r = chase_symlinks_and_access(path, esp_path, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, F_OK, NULL, NULL);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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@@ -1172,7 +1172,7 @@ static int remove_boot_efi(const char *esp_path) {
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_cleanup_free_ char *p = NULL;
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int r, c = 0;
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- r = chase_symlinks_and_opendir("/EFI/BOOT", esp_path, CHASE_PREFIX_ROOT, &p, &d);
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+ r = chase_symlinks_and_opendir("/EFI/BOOT", esp_path, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &p, &d);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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diff --git a/src/shared/bootspec.c b/src/shared/bootspec.c
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index fe44b5e9d2..9352416af5 100644
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--- a/src/shared/bootspec.c
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+++ b/src/shared/bootspec.c
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@@ -507,7 +507,7 @@ static int boot_loader_read_conf_path(BootConfig *config, const char *root, cons
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assert(config);
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assert(path);
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- r = chase_symlinks_and_fopen_unlocked(path, root, CHASE_PREFIX_ROOT, "re", &full, &f);
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+ r = chase_symlinks_and_fopen_unlocked(path, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, "re", &full, &f);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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@@ -609,7 +609,7 @@ static int boot_entries_find_type1(
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assert(root);
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assert(dir);
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- dir_fd = chase_symlinks_and_open(dir, root, CHASE_PREFIX_ROOT, O_DIRECTORY|O_CLOEXEC, &full);
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+ dir_fd = chase_symlinks_and_open(dir, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, O_DIRECTORY|O_CLOEXEC, &full);
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if (dir_fd == -ENOENT)
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return 0;
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if (dir_fd < 0)
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@@ -869,7 +869,7 @@ static int boot_entries_find_unified(
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assert(config);
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assert(dir);
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- r = chase_symlinks_and_opendir(dir, root, CHASE_PREFIX_ROOT, &full, &d);
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+ r = chase_symlinks_and_opendir(dir, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, &full, &d);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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@@ -1282,7 +1282,7 @@ static void boot_entry_file_list(
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assert(p);
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assert(ret_status);
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- int status = chase_symlinks_and_access(p, root, CHASE_PREFIX_ROOT, F_OK, NULL, NULL);
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+ int status = chase_symlinks_and_access(p, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, F_OK, NULL, NULL);
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printf("%13s%s ", strempty(field), field ? ":" : " ");
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if (status < 0) {
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